git-svn-id: http://webrtc.googlecode.com/svn/trunk@6 4adac7df-926f-26a2-2b94-8c16560cd09d

system_wrappers/OWNERS

@@ -0,0 +1,6 @@
+hellner@google.com
+pwestin@google.com
+perkj@google.com
+henrika@google.com
+grunell@google.com
+mflodman@google.com

system_wrappers/interface/aligned_malloc.h

@@ -0,0 +1,25 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_SYSTEM_WRAPPERS_INTERFACE_ALIGNED_MALLOC_H_
+#define WEBRTC_SYSTEM_WRAPPERS_INTERFACE_ALIGNED_MALLOC_H_
+
+#include <stddef.h>
+
+namespace webrtc
+{
+    void* AlignedMalloc(
+        size_t size,
+        size_t alignment);
+    void AlignedFree(
+        void* memBlock);
+}
+
+#endif // WEBRTC_SYSTEM_WRAPPERS_INTERFACE_ALIGNED_MALLOC_H_

system_wrappers/interface/atomic32_wrapper.h

@@ -0,0 +1,55 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+// Atomic system independant 32-bit integer.
+// Note: uses full memory barriers.
+// Note: assumes 32-bit (or higher) system
+#ifndef WEBRTC_SYSTEM_WRAPPERS_INTERFACE_ATOMIC32_WRAPPER_H_
+#define WEBRTC_SYSTEM_WRAPPERS_INTERFACE_ATOMIC32_WRAPPER_H_
+
+#include "common_types.h"
+
+namespace webrtc {
+class Atomic32Impl;
+class Atomic32Wrapper
+{
+public:
+    Atomic32Wrapper(WebRtc_Word32 initialValue = 0);
+    ~Atomic32Wrapper();
+
+    // Prefix operator!
+    WebRtc_Word32 operator++();
+    WebRtc_Word32 operator--();
+
+    Atomic32Wrapper& operator=(const Atomic32Wrapper& rhs);
+    Atomic32Wrapper& operator=(WebRtc_Word32 rhs);
+
+    WebRtc_Word32 operator+=(WebRtc_Word32 rhs);
+    WebRtc_Word32 operator-=(WebRtc_Word32 rhs);
+
+    // Sets the value atomically to newValue if the value equals compare value.
+    // The function returns true if the exchange happened.
+    bool CompareExchange(WebRtc_Word32 newValue, WebRtc_Word32 compareValue);
+    WebRtc_Word32 Value() const;
+private:
+    // Disable the + and - operator since it's unclear what these operations
+    // should do.
+    Atomic32Wrapper operator+(const Atomic32Wrapper& rhs);
+    Atomic32Wrapper operator-(const Atomic32Wrapper& rhs);
+
+    WebRtc_Word32& operator++(int);
+    WebRtc_Word32& operator--(int);
+
+    // Cheshire cat to hide the implementation (faster than
+    // using virtual functions)
+    Atomic32Impl& _impl;
+};
+} // namespace webrtc
+#endif // WEBRTC_SYSTEM_WRAPPERS_INTERFACE_ATOMIC32_WRAPPER_H_

system_wrappers/interface/condition_variable_wrapper.h

@@ -0,0 +1,41 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_SYSTEM_WRAPPERS_INTERFACE_CONDITION_VARIABLE_WRAPPER_H_
+#define WEBRTC_SYSTEM_WRAPPERS_INTERFACE_CONDITION_VARIABLE_WRAPPER_H_
+
+namespace webrtc {
+class CriticalSectionWrapper;
+
+class ConditionVariableWrapper
+{
+public:
+    // Factory method, constructor disabled.
+    static ConditionVariableWrapper* CreateConditionVariable();
+
+    virtual ~ConditionVariableWrapper() {}
+
+    // Calling thread will atomically release critSect and wait until next
+    // some other thread calls Wake() or WakeAll().
+    virtual void SleepCS(CriticalSectionWrapper& critSect) = 0;
+
+    // Same as above but with a timeout.
+    virtual bool SleepCS(CriticalSectionWrapper& critSect,
+                         unsigned long maxTimeInMS) = 0;
+
+    // Wakes one thread calling SleepCS().
+    virtual void Wake() = 0;
+
+    // Wakes all threads calling SleepCS().
+    virtual void WakeAll() = 0;
+};
+} // namespace webrtc
+
+#endif // WEBRTC_SYSTEM_WRAPPERS_INTERFACE_CONDITION_VARIABLE_WRAPPER_H_

system_wrappers/interface/constructor_magic.h

@@ -0,0 +1,50 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+/*
+ * WebRtc
+ * Copy from third_party/libjingle/source/talk/base/constructormagic.h
+ */
+
+#ifndef WEBRTC_SYSTEM_WRAPPERS_INTERFACE_CONSTRUCTOR_MAGIC_H_
+#define WEBRTC_SYSTEM_WRAPPERS_INTERFACE_CONSTRUCTOR_MAGIC_H_
+
+#ifndef DISALLOW_ASSIGN
+#define DISALLOW_ASSIGN(TypeName) \
+  void operator=(const TypeName&)
+#endif
+
+#ifndef DISALLOW_COPY_AND_ASSIGN
+// A macro to disallow the evil copy constructor and operator= functions
+// This should be used in the private: declarations for a class
+#define DISALLOW_COPY_AND_ASSIGN(TypeName)    \
+  TypeName(const TypeName&);                    \
+  DISALLOW_ASSIGN(TypeName)
+#endif
+
+#ifndef DISALLOW_EVIL_CONSTRUCTORS
+// Alternative, less-accurate legacy name.
+#define DISALLOW_EVIL_CONSTRUCTORS(TypeName) \
+  DISALLOW_COPY_AND_ASSIGN(TypeName)
+#endif
+
+#ifndef DISALLOW_IMPLICIT_CONSTRUCTORS
+// A macro to disallow all the implicit constructors, namely the
+// default constructor, copy constructor and operator= functions.
+//
+// This should be used in the private: declarations for a class
+// that wants to prevent anyone from instantiating it. This is
+// especially useful for classes containing only static methods.
+#define DISALLOW_IMPLICIT_CONSTRUCTORS(TypeName) \
+  TypeName();                                    \
+  DISALLOW_EVIL_CONSTRUCTORS(TypeName)
+#endif
+
+#endif  // WEBRTC_SYSTEM_WRAPPERS_INTERFACE_CONSTRUCTOR_MAGIC_H_

system_wrappers/interface/cpu_features_wrapper.h

@@ -0,0 +1,34 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_SYSTEM_WRAPPERS_INTERFACE_CPU_FEATURES_WRAPPER_H_
+#define WEBRTC_SYSTEM_WRAPPERS_INTERFACE_CPU_FEATURES_WRAPPER_H_
+
+#if defined(__cplusplus) || defined(c_plusplus)
+extern "C" {
+#endif
+
+// list of features.
+typedef enum {
+  kSSE2,
+  kSSE3
+} CPUFeature;
+
+typedef int (*WebRtc_CPUInfo)(CPUFeature feature);
+// returns true if the CPU supports the feature.
+extern WebRtc_CPUInfo WebRtc_GetCPUInfo;
+// No CPU feature is available => straight C path.
+extern WebRtc_CPUInfo WebRtc_GetCPUInfoNoASM;
+
+#if defined(__cplusplus) || defined(c_plusplus)
+}    // extern "C"
+#endif
+
+#endif // WEBRTC_SYSTEM_WRAPPERS_INTERFACE_CPU_FEATURES_WRAPPER_H_

system_wrappers/interface/cpu_wrapper.h

@@ -0,0 +1,51 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_SYSTEM_WRAPPERS_INTERFACE_CPU_WRAPPER_H_
+#define WEBRTC_SYSTEM_WRAPPERS_INTERFACE_CPU_WRAPPER_H_
+
+#include "typedefs.h"
+
+namespace webrtc {
+class CpuWrapper
+{
+public:
+    static WebRtc_UWord32 DetectNumberOfCores();
+
+    static CpuWrapper* CreateCpu();
+    virtual ~CpuWrapper() {}
+
+    // Returns the average CPU usage for all processors. The CPU usage can be
+    // between and including 0 to 100 (%)
+    virtual WebRtc_Word32 CpuUsage() = 0;
+    virtual WebRtc_Word32 CpuUsage(WebRtc_Word8* processName,
+                                   WebRtc_UWord32 length) = 0;
+    virtual WebRtc_Word32 CpuUsage(WebRtc_UWord32  dwProcessID) = 0;
+
+    // The CPU usage per core is returned in cpu_usage. The CPU can be between
+    // and including 0 to 100 (%)
+    // Note that the pointer passed as cpu_usage is redirected to a local member
+    // of the CPU wrapper.
+    // numCores is the number of cores in the cpu_usage array.
+    virtual WebRtc_Word32 CpuUsageMultiCore(WebRtc_UWord32& numCores,
+                                            WebRtc_UWord32*& cpu_usage) = 0;
+
+    virtual void Reset() = 0;
+    virtual void Stop() = 0;
+
+protected:
+    CpuWrapper() {}
+
+private:
+    static WebRtc_UWord32 _numberOfCores;
+
+};
+} // namespace webrtc
+#endif // WEBRTC_SYSTEM_WRAPPERS_INTERFACE_CPU_WRAPPER_H_

system_wrappers/interface/critical_section_wrapper.h

@@ -0,0 +1,66 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_SYSTEM_WRAPPERS_INTERFACE_CRITICAL_SECTION_WRAPPER_H_
+#define WEBRTC_SYSTEM_WRAPPERS_INTERFACE_CRITICAL_SECTION_WRAPPER_H_
+
+// If the critical section is heavily contended it may be beneficial to use
+// read/write locks instead.
+
+#include "common_types.h"
+
+namespace webrtc {
+class CriticalSectionWrapper
+{
+public:
+    // Factory method, constructor disabled
+    static CriticalSectionWrapper* CreateCriticalSection();
+
+    virtual ~CriticalSectionWrapper() {}
+
+    // Tries to grab lock, beginning of a critical section. Will wait for the
+    // lock to become available if the grab failed.
+    virtual void Enter() = 0;
+
+    // Returns a grabbed lock, end of critical section.
+    virtual void Leave() = 0;
+};
+
+// RAII extension of the critical section. Prevents Enter/Leave missmatches and
+// provides more compact critical section syntax.
+class CriticalSectionScoped
+{
+public:
+    CriticalSectionScoped(CriticalSectionWrapper& critsec)
+        :
+        _ptrCritSec(&critsec)
+    {
+        _ptrCritSec->Enter();
+    }
+
+    ~CriticalSectionScoped()
+    {
+        if (_ptrCritSec)
+        {
+            Leave();
+        }
+    }
+
+private:
+    void Leave()
+    {
+        _ptrCritSec->Leave();
+        _ptrCritSec = 0;
+    }
+
+    CriticalSectionWrapper* _ptrCritSec;
+};
+} // namespace webrtc
+#endif // WEBRTC_SYSTEM_WRAPPERS_INTERFACE_CRITICAL_SECTION_WRAPPER_H_

system_wrappers/interface/event_wrapper.h

@@ -0,0 +1,68 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_SYSTEM_WRAPPERS_INTERFACE_EVENT_WRAPPER_H_
+#define WEBRTC_SYSTEM_WRAPPERS_INTERFACE_EVENT_WRAPPER_H_
+
+namespace webrtc {
+enum EventTypeWrapper
+{
+    kEventSignaled = 1,
+    kEventError = 2,
+    kEventTimeout = 3
+};
+
+#define WEBRTC_EVENT_10_SEC   10000
+#define WEBRTC_EVENT_INFINITE 0xffffffff
+
+class EventWrapper
+{
+public:
+    // Factory method. Constructor disabled.
+    static EventWrapper* Create();
+    virtual ~EventWrapper() {}
+
+    // Releases threads who are calling Wait() and has started waiting. Please
+    // note that a thread calling Wait() will not start waiting immediately.
+    // assumptions to the contrary is a very common source of issues in
+    // multithreaded programming.
+    // Set is sticky in the sense that it will release at least one thread
+    // either immediately or some time in the future.
+    virtual bool Set() = 0;
+
+    // Prevents future Wait() calls from finishing without a new Set() call.
+    virtual bool Reset() = 0;
+
+    // Puts the calling thread into a wait state. The thread may be released
+    // by a Set() call depending on if other threads are waiting and if so on
+    // timing. The thread that was released will call Reset() before leaving
+    // preventing more threads from being released. If multiple threads
+    // are waiting for the same Set(), only one (random) thread is guaranteed to
+    // be released. It is possible that multiple (random) threads are released
+    // Depending on timing.
+    virtual EventTypeWrapper Wait(unsigned long maxTime) = 0;
+
+    // Starts a timer that will call a non-sticky version of Set() either once
+    // or periodically. If the timer is periodic it ensures that there is no
+    // drift over time relative to the system clock.
+    virtual bool StartTimer(bool periodic, unsigned long time) = 0;
+
+    virtual bool StopTimer() = 0;
+
+    // Only implemented on Windows
+    // Returns 1 if a key has been pressed since last call to this function.
+    // -1 indicates failure
+    // 0 indicates no key has been pressed since last call
+    // TODO(hellner) this function does not seem to belong here
+    static int KeyPressed();
+};
+} // namespace webrtc
+
+#endif // WEBRTC_SYSTEM_WRAPPERS_INTERFACE_EVENT_WRAPPER_H_

system_wrappers/interface/file_wrapper.h

@@ -0,0 +1,72 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_SYSTEM_WRAPPERS_INTERFACE_FILE_WRAPPER_H_
+#define WEBRTC_SYSTEM_WRAPPERS_INTERFACE_FILE_WRAPPER_H_
+
+#include "common_types.h"
+#include "typedefs.h"
+
+// Implementation of an InStream and OutStream that can read (exclusive) or
+// write from/to a file.
+
+namespace webrtc {
+class FileWrapper : public InStream, public OutStream
+{
+public:
+    enum { kMaxFileNameSize = 1024};
+    enum { kFileMaxTextMessageSize = 1024};
+
+    // Factory method. Constructor disabled.
+    static FileWrapper* Create();
+
+    // Returns true if a file has been opened.
+    virtual bool Open() const = 0;
+
+    // Opens a file in read or write mode, decided by the readOnly parameter.
+    virtual WebRtc_Word32 OpenFile(const WebRtc_Word8* fileNameUTF8,
+                                   const bool readOnly,
+                                   const bool loop = false,
+                                   const bool text = false) = 0;
+
+    virtual WebRtc_Word32 CloseFile() = 0;
+
+    // Limits the file size.
+    virtual WebRtc_Word32 SetMaxFileSize(WebRtc_Word32 bytes)  = 0;
+
+    // Flush any pending writes.
+    virtual WebRtc_Word32 Flush() = 0;
+
+    // Returns the opened file's name in fileNameUTF8. size is the allocated
+    // size of fileNameUTF8. The name will be truncated if the size of
+    // fileNameUTF8 is to small.
+    virtual WebRtc_Word32 FileName(WebRtc_Word8* fileNameUTF8,
+                                   WebRtc_UWord32 size) const = 0;
+
+    // Write text to the opened file. The written text can contain plain text
+    // and text with type specifiers in the same way as sprintf works.
+    virtual WebRtc_Word32 WriteText(const WebRtc_Word8* text, ...) = 0;
+
+    // Reads len number of bytes from buf to file.
+    virtual int Read(void* buf, int len) = 0;
+
+    // Writes len number of bytes to buf from file. Please note that the actual
+    // writing to file may happen some time later. Call flush to force a write
+    // to take affect
+    virtual bool Write(const void *buf,int len) = 0;
+
+    // Rewinds the file to the start. Only available when OpenFile() has been
+    // called with loop argument set to true. Or readOnly argument has been set
+    // to false.
+    virtual int Rewind() = 0;
+};
+} // namespace webrtc
+
+#endif // WEBRTC_SYSTEM_WRAPPERS_INTERFACE_FILE_WRAPPER_H_

system_wrappers/interface/fix_interlocked_exchange_pointer_windows.h

@@ -0,0 +1,35 @@
+// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file under third_party_mods/chromium directory of
+// source tree or at
+// http://src.chromium.org/viewvc/chrome/trunk/src/LICENSE
+
+// Various inline functions and macros to fix compilation of 32 bit target
+// on MSVC with /Wp64 flag enabled.
+
+// The original code can be found here:
+// http://src.chromium.org/svn/trunk/src/base/fix_wp64.h
+
+#ifndef WEBRTC_SYSTEM_WRAPPERS_SOURCE_FIX_INTERLOCKED_EXCHANGE_POINTER_WINDOWS_H_
+#define WEBRTC_SYSTEM_WRAPPERS_SOURCE_FIX_INTERLOCKED_EXCHANGE_POINTER_WINDOWS_H_
+
+#include <windows.h>
+
+// Platform SDK fixes when building with /Wp64 for a 32 bits target.
+#if !defined(_WIN64) && defined(_Wp64)
+
+#ifdef InterlockedExchangePointer
+#undef InterlockedExchangePointer
+// The problem is that the macro provided for InterlockedExchangePointer() is
+// doing a (LONG) C-style cast that triggers invariably the warning C4312 when
+// building on 32 bits.
+inline void* InterlockedExchangePointer(void* volatile* target, void* value) {
+  return reinterpret_cast<void*>(static_cast<LONG_PTR>(InterlockedExchange(
+      reinterpret_cast<volatile LONG*>(target),
+      static_cast<LONG>(reinterpret_cast<LONG_PTR>(value)))));
+}
+#endif  // #ifdef InterlockedExchangePointer
+
+#endif // #if !defined(_WIN64) && defined(_Wp64)
+
+#endif // WEBRTC_SYSTEM_WRAPPERS_SOURCE_FIX_INTERLOCKED_EXCHANGE_POINTER_WINDOWS_H_

system_wrappers/interface/list_wrapper.h

@@ -0,0 +1,109 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_SYSTEM_WRAPPERS_INTERFACE_LIST_WRAPPER_H_
+#define WEBRTC_SYSTEM_WRAPPERS_INTERFACE_LIST_WRAPPER_H_
+
+#include "constructor_magic.h"
+
+namespace webrtc {
+class CriticalSectionWrapper;
+
+class ListItem
+{
+friend class ListWrapper;
+
+public:
+    ListItem(const void* ptr);
+    ListItem(const unsigned int item);
+    virtual ~ListItem();
+    void* GetItem() const;
+    unsigned int GetUnsignedItem() const;
+
+protected:
+    ListItem* next_;
+    ListItem* prev_;
+
+private:
+    const void*         item_ptr_;
+    const unsigned int  item_;
+    DISALLOW_COPY_AND_ASSIGN(ListItem);
+};
+
+class ListWrapper
+{
+public:
+    ListWrapper();
+    virtual ~ListWrapper();
+
+    // Returns the number of elements stored in the list.
+    unsigned int GetSize() const;
+
+    // Puts a pointer to anything last in the list.
+    int PushBack(const void* ptr);
+    // Puts a pointer to anything first in the list.
+    int PushFront(const void* ptr);
+
+    // Puts a copy of the specified integer last in the list.
+    int PushBack(const unsigned int item_id);
+    // Puts a copy of the specified integer first in the list.
+    int PushFront(const unsigned int item_id);
+
+    // Pops the first ListItem from the list
+    int PopFront();
+
+    // Pops the last ListItem from the list
+    int PopBack();
+
+    // Returns true if the list is empty
+    bool Empty() const;
+
+    // Returns a pointer to the first ListItem in the list.
+    ListItem* First() const;
+
+    // Returns a pointer to the last ListItem in the list.
+    ListItem* Last() const;
+
+    // Returns a pointer to the ListItem stored after item in the list.
+    ListItem* Next(ListItem* item) const;
+
+    // Returns a pointer to the ListItem stored before item in the list.
+    ListItem* Previous(ListItem* item) const;
+
+    // Removes item from the list.
+    int Erase(ListItem* item);
+
+    // Insert list item after existing_previous_item. Please note that new_item
+    // must be created using new ListItem(). The map will take ownership of
+    // new_item following a successfull insert. If insert fails new_item will
+    // not be released by the List
+    int Insert(ListItem* existing_previous_item,
+               ListItem* new_item);
+
+    // Insert list item before existing_next_item. Please note that new_item
+    // must be created using new ListItem(). The map will take ownership of
+    // new_item following a successfull insert. If insert fails new_item will
+    // not be released by the List
+    int InsertBefore(ListItem* existing_next_item,
+                     ListItem* new_item);
+
+private:
+    void PushBackImpl(ListItem* item);
+    void PushFrontImpl(ListItem* item);
+
+    CriticalSectionWrapper* critical_section_;
+    ListItem* first_;
+    ListItem* last_;
+    unsigned int size_;
+    DISALLOW_COPY_AND_ASSIGN(ListWrapper);
+};
+} //namespace webrtc
+
+#endif // WEBRTC_SYSTEM_WRAPPERS_INTERFACE_LIST_WRAPPER_H_

system_wrappers/interface/map_wrapper.h

@@ -0,0 +1,77 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_SYSTEM_WRAPPERS_INTERFACE_MAP_WRAPPER_H_
+#define WEBRTC_SYSTEM_WRAPPERS_INTERFACE_MAP_WRAPPER_H_
+
+#include <map>
+
+#include "constructor_magic.h"
+
+namespace webrtc {
+class MapItem
+{
+friend class MapWrapper;
+
+public:
+    MapItem(int id, void* ptr);
+    virtual ~MapItem();
+    void* GetItem();
+    int GetId();
+    unsigned int GetUnsignedId();
+    void SetItem(void* ptr);
+
+private:
+    int   item_id_;
+    void* item_pointer_;
+    DISALLOW_COPY_AND_ASSIGN(MapItem);
+};
+
+class MapWrapper
+{
+public:
+    MapWrapper();
+    ~MapWrapper();
+
+    // Puts a pointer to anything in the map and associates it with id. Note, id
+    // needs to be unique for all items in the map.
+    int Insert(int id, void* ptr);
+
+    // Removes item from map.
+    int Erase(MapItem* item);
+
+    // Finds item with associated with id and removes it from the map.
+    int Erase(int id);
+
+    // Returns the number of elements stored in the map.
+    int Size() const;
+
+    // Returns a pointer to the first MapItem in the map.
+    MapItem* First() const;
+
+    // Returns a pointer to the last MapItem in the map.
+    MapItem* Last() const;
+
+    // Returns a pointer to the MapItem stored after item in the map.
+    MapItem* Next(MapItem* item) const;
+
+    // Returns a pointer to the MapItem stored before item in the map.
+    MapItem* Previous(MapItem* item) const;
+
+    // Returns a pointer to the MapItem associated with id from the map.
+    MapItem* Find(int id) const;
+
+private:
+    std::map<int, MapItem*>    map_;
+    DISALLOW_COPY_AND_ASSIGN(MapWrapper);
+};
+} // namespace webrtc
+
+#endif  // WEBRTC_SYSTEM_WRAPPERS_INTERFACE_MAP_WRAPPER_H_

system_wrappers/interface/rw_lock_wrapper.h

@@ -0,0 +1,76 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_SYSTEM_WRAPPERS_INTERFACE_RW_LOCK_WRAPPER_H_
+#define WEBRTC_SYSTEM_WRAPPERS_INTERFACE_RW_LOCK_WRAPPER_H_
+
+// Note, Windows pre-Vista version of RW locks are not supported nativly. For
+// these OSs regular critical sections have been used to approximate RW lock
+// functionality and will therefore have worse performance.
+
+namespace webrtc {
+class RWLockWrapper
+{
+public:
+    static RWLockWrapper* CreateRWLock();
+    virtual ~RWLockWrapper();
+
+    virtual void AcquireLockExclusive() = 0;
+    virtual void ReleaseLockExclusive() = 0;
+
+    virtual void AcquireLockShared() = 0;
+    virtual void ReleaseLockShared() = 0;
+
+protected:
+    virtual int Init() = 0;
+};
+
+// RAII extensions of the RW lock. Prevents Acquire/Release missmatches and
+// provides more compact locking syntax.
+class ReadLockScoped
+{
+public:
+    ReadLockScoped(RWLockWrapper& rwLock)
+        :
+        _rwLock(rwLock)
+    {
+        _rwLock.AcquireLockShared();
+    }
+
+    ~ReadLockScoped()
+    {
+        _rwLock.ReleaseLockShared();
+    }
+
+private:
+    RWLockWrapper& _rwLock;
+};
+
+class WriteLockScoped
+{
+public:
+    WriteLockScoped(RWLockWrapper& rwLock)
+        :
+        _rwLock(rwLock)
+    {
+        _rwLock.AcquireLockExclusive();
+    }
+
+    ~WriteLockScoped()
+    {
+        _rwLock.ReleaseLockExclusive();
+    }
+
+private:
+    RWLockWrapper& _rwLock;
+};
+} // namespace webrtc
+
+#endif // WEBRTC_SYSTEM_WRAPPERS_INTERFACE_RW_LOCK_WRAPPER_H_

system_wrappers/interface/sort.h

@@ -0,0 +1,64 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+// Generic unstable sorting routines.
+
+#ifndef WEBRTC_SYSTEM_WRAPPERS_INTERFACE_SORT_H_
+#define WEBRTC_SYSTEM_WRAPPERS_INTERFACE_SORT_H_
+
+#include "typedefs.h"
+#include "common_types.h"
+
+namespace webrtc
+{
+    enum Type
+    {
+        TYPE_Word8,
+        TYPE_UWord8,
+        TYPE_Word16,
+        TYPE_UWord16,
+        TYPE_Word32,
+        TYPE_UWord32,
+        TYPE_Word64,
+        TYPE_UWord64,
+        TYPE_Float32,
+        TYPE_Float64
+    };
+    // Sorts intrinsic data types.
+    //
+    // data          [in/out] A pointer to an array of intrinsic type.
+    //               Upon return it will be sorted in ascending order.
+    // numOfElements The number of elements in the array.
+    // dataType      Enum corresponding to the type of the array.
+    //
+    // returns 0 on success, -1 on failure.
+    WebRtc_Word32 Sort(void* data, WebRtc_UWord32 numOfElements, Type dataType);
+
+    // Sorts arbitrary data types. This requires an array of intrinsically typed
+    // key values which will be used to sort the data array. There must be a
+    // one-to-one correspondence between data elements and key elements, with
+    // corresponding elements sharing the same position in their respective
+    // arrays.
+    //
+    // data          [in/out] A pointer to an array of arbitrary type.
+    //               Upon return it will be sorted in ascending order.
+    // key           [in] A pointer to an array of keys used to sort the
+    //               data array.
+    // numOfElements The number of elements in the arrays.
+    // sizeOfElement The size, in bytes, of the data array.
+    // keyType       Enum corresponding to the type of the key array.
+    //
+    // returns 0 on success, -1 on failure.
+    //
+    WebRtc_Word32 KeySort(void* data, void* key, WebRtc_UWord32 numOfElements,
+                          WebRtc_UWord32 sizeOfElement, Type keyType);
+}
+
+#endif // WEBRTC_SYSTEM_WRAPPERS_INTERFACE_SORT_H_

system_wrappers/interface/thread_wrapper.h

@@ -0,0 +1,86 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+// System independant wrapper for spawning threads
+// Note: the spawned thread will loop over the callback function until stopped.
+// Note: The callback function is expected to return every 2 seconds or more
+// often.
+
+#ifndef WEBRTC_SYSTEM_WRAPPERS_INTERFACE_THREAD_WRAPPER_H_
+#define WEBRTC_SYSTEM_WRAPPERS_INTERFACE_THREAD_WRAPPER_H_
+
+namespace webrtc {
+// Object that will be passed by the spawned thread when it enters the callback
+// function.
+#define ThreadObj void*
+
+// Callback function that the spawned thread will enter once spawned
+typedef  bool(*ThreadRunFunction)(ThreadObj);
+
+enum ThreadPriority
+{
+    kLowPriority = 1,
+    kNormalPriority = 2,
+    kHighPriority = 3,
+    kHighestPriority = 4,
+    kRealtimePriority = 5
+};
+
+class ThreadWrapper
+{
+public:
+    enum {kThreadMaxNameLength = 64};
+
+    virtual ~ThreadWrapper() {};
+
+    // Factory method. Constructor disabled.
+    //
+    // func        Pointer to a, by user, specified callback function.
+    // obj         Object associated with the thread. Passed in the callback
+    //             function.
+    // prio        Thread priority. May require root/admin rights.
+    // threadName  NULL terminated thread name, will be visable in the Windows
+    //             debugger.
+    static ThreadWrapper* CreateThread(ThreadRunFunction func = 0,
+                                    ThreadObj obj= 0,
+                                    ThreadPriority prio = kNormalPriority,
+                                    const char* threadName = 0);
+
+    // Non blocking termination of the spawned thread. Note that it is not safe
+    // to delete this class until the spawned thread has been reclaimed.
+    virtual void SetNotAlive() = 0;
+
+    // Spawns the thread. This will start the triggering of the callback
+    // function.
+    virtual bool Start(unsigned int& id) = 0;
+
+    // Sets the threads CPU affinity. CPUs are listed 0 - (number of CPUs - 1).
+    // The numbers in processorNumbers specify which CPUs are allowed to run the
+    // thread. processorNumbers should not contain any duplicates and elements
+    // should be lower than (number of CPUs - 1). amountOfProcessors should be
+    // equal to the number of processors listed in processorNumbers
+    virtual bool SetAffinity(const int* /*processorNumbers*/,
+                             const unsigned int /*amountOfProcessors*/)
+                            {return false;}
+
+    // Stops the spawned thread and waits for it to be reclaimed with a timeout
+    // of two seconds. Will return false if the thread was not reclaimed.
+    // Multiple tries to Stop are allowed (e.g. to wait longer than 2 seconds).
+    // It's ok to call Stop() even if the spawned thread has been reclaimed.
+    virtual bool Stop() = 0;
+
+    // Stops the spawned thread dead in its tracks. Will likely result in a
+    // corrupt state. There should be an extremely good reason for even looking
+    // at this function. Can cause many problems deadlock being one of them.
+    virtual bool Shutdown() {return false;}
+};
+} // namespace webrtc
+
+#endif // WEBRTC_SYSTEM_WRAPPERS_INTERFACE_THREAD_WRAPPER_H_

system_wrappers/interface/tick_util.h

@@ -0,0 +1,304 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+// System independant wrapper for polling elapsed time in ms and us.
+// The implementation works in the tick domain which can be mapped over to the
+// time domain.
+#ifndef WEBRTC_SYSTEM_WRAPPERS_INTERFACE_TICK_UTIL_H_
+#define WEBRTC_SYSTEM_WRAPPERS_INTERFACE_TICK_UTIL_H_
+
+#if _WIN32
+#include <windows.h>
+#include <mmsystem.h>
+#elif WEBRTC_LINUX
+#include <ctime>
+#else
+#include <sys/time.h>
+#include <time.h>
+#endif
+
+#include "typedefs.h"
+
+namespace webrtc {
+class TickInterval;
+
+class TickTime
+{
+public:
+    // Current time in the tick domain.
+    static TickTime Now();
+
+    // Now in the time domain in ms.
+    static WebRtc_Word64 MillisecondTimestamp();
+
+    // Now in the time domain in us.
+    static WebRtc_Word64 MicrosecondTimestamp();
+
+    WebRtc_Word64 Ticks() const;
+
+    static WebRtc_Word64 MillisecondsToTicks(const WebRtc_Word64 ms);
+
+    static WebRtc_Word64 TicksToMilliseconds(const WebRtc_Word64 ticks);
+
+    // Returns a TickTime that is ticks later than the passed TickTime
+    friend TickTime operator+(const TickTime lhs, const WebRtc_Word64 ticks);
+    TickTime& operator+=(const WebRtc_Word64& rhs);
+
+
+    // Returns a TickInterval that is the difference in ticks beween rhs and lhs
+    friend TickInterval operator-(const TickTime& lhs, const TickTime& rhs);
+private:
+    WebRtc_Word64 _ticks;
+};
+
+class TickInterval
+{
+public:
+    TickInterval();
+
+    WebRtc_Word64 Milliseconds() const;
+    WebRtc_Word64 Microseconds() const;
+
+    // Returns the sum of two TickIntervals as a TickInterval
+    friend TickInterval operator+(const TickInterval& lhs,
+                                  const TickInterval& rhs);
+    TickInterval& operator-=(const TickInterval& rhs);
+
+    // Returns a TickInterval corresponding to rhs - lhs
+    friend TickInterval operator-(const TickInterval& lhs,
+                                  const TickInterval& rhs);
+    TickInterval& operator+=(const TickInterval& rhs);
+
+private:
+    TickInterval(WebRtc_Word64 interval);
+
+    friend class TickTime;
+    friend TickInterval operator-(const TickTime& lhs, const TickTime& rhs);
+
+private:
+    WebRtc_Word64 _interval;
+};
+
+inline TickInterval operator+(const TickInterval& lhs, const TickInterval& rhs)
+{
+    return TickInterval(lhs._interval + rhs._interval);
+}
+
+inline TickInterval operator-(const TickInterval& lhs, const TickInterval& rhs)
+{
+    return TickInterval(lhs._interval - rhs._interval);
+}
+
+inline TickInterval operator-(const TickTime& lhs,const TickTime& rhs)
+{
+    return TickInterval(lhs._ticks - rhs._ticks);
+}
+
+inline TickTime operator+(const TickTime lhs, const WebRtc_Word64 ticks)
+{
+    TickTime time = lhs;
+    time._ticks += ticks;
+    return time;
+}
+
+inline TickTime TickTime::Now()
+{
+    TickTime result;
+#if _WIN32
+    #ifdef USE_QUERY_PERFORMANCE_COUNTER
+        // QueryPerformanceCounter returns the value from the TSC which is
+        // incremented at the CPU frequency. The algorithm used requires
+        // the CPU frequency to be constant. Technology like speed stepping
+        // which has variable CPU frequency will therefore yield unpredictable,
+        // incorrect time estimations.
+        LARGE_INTEGER qpcnt;
+        QueryPerformanceCounter(&qpcnt);
+        result._ticks = qpcnt.QuadPart;
+    #else
+        static volatile LONG lastTimeGetTime = 0;
+        static volatile WebRtc_Word64 numWrapTimeGetTime = 0;
+        volatile LONG* lastTimeGetTimePtr = &lastTimeGetTime;
+        DWORD now = timeGetTime();
+        // Atomically update the last gotten time
+        DWORD old = InterlockedExchange(lastTimeGetTimePtr, now);
+        if(now < old)
+        {
+            // If now is earlier than old, there may have been a race between
+            // threads.
+            // 0x0fffffff ~3.1 days, the code will not take that long to execute
+            // so it must have been a wrap around.
+            if(old > 0xf0000000 && now < 0x0fffffff) 
+            {
+                numWrapTimeGetTime++;
+            }
+        }
+        result._ticks = now + (numWrapTimeGetTime<<32);
+    #endif
+#elif defined(WEBRTC_LINUX)
+    struct timespec ts;
+    #ifdef WEBRTC_CLOCK_TYPE_REALTIME
+        clock_gettime(CLOCK_REALTIME, &ts);
+    #else
+        clock_gettime(CLOCK_MONOTONIC, &ts);
+    #endif
+    result._ticks = 1000000000LL * static_cast<WebRtc_Word64>(ts.tv_sec) + static_cast<WebRtc_Word64>(ts.tv_nsec);
+#else
+    struct timeval tv;
+    gettimeofday(&tv, NULL);
+    result._ticks = 1000000LL * static_cast<WebRtc_Word64>(tv.tv_sec) + static_cast<WebRtc_Word64>(tv.tv_usec);
+#endif
+    return result;
+}
+
+inline WebRtc_Word64 TickTime::MillisecondTimestamp()
+{
+    TickTime now = TickTime::Now();
+#if _WIN32
+    #ifdef USE_QUERY_PERFORMANCE_COUNTER
+        LARGE_INTEGER qpfreq;
+        QueryPerformanceFrequency(&qpfreq);
+        return (now._ticks * 1000) / qpfreq.QuadPart;
+    #else
+        return now._ticks;
+    #endif
+#elif WEBRTC_LINUX
+    return now._ticks / 1000000LL;
+#else
+    return now._ticks / 1000LL;
+#endif
+}
+
+inline WebRtc_Word64 TickTime::MicrosecondTimestamp()
+{
+    TickTime now = TickTime::Now();
+
+#if _WIN32
+    #ifdef USE_QUERY_PERFORMANCE_COUNTER
+        LARGE_INTEGER qpfreq;
+        QueryPerformanceFrequency(&qpfreq);
+        return (now._ticks * 1000) / (qpfreq.QuadPart/1000);
+    #else
+        return now._ticks *1000LL;
+    #endif
+#elif WEBRTC_LINUX
+    return now._ticks / 1000LL;
+#else
+    return now._ticks;
+#endif
+}
+
+inline WebRtc_Word64 TickTime::Ticks() const
+{
+    return _ticks;
+}
+
+inline WebRtc_Word64 TickTime::MillisecondsToTicks(const WebRtc_Word64 ms)
+{
+#if _WIN32
+    #ifdef USE_QUERY_PERFORMANCE_COUNTER
+        LARGE_INTEGER qpfreq;
+        QueryPerformanceFrequency(&qpfreq);
+        return (qpfreq.QuadPart * ms) / 1000;
+    #else
+        return ms;
+    #endif
+#elif WEBRTC_LINUX
+    return ms * 1000000LL;
+#else
+    return ms * 1000LL;
+#endif
+}
+
+inline WebRtc_Word64 TickTime::TicksToMilliseconds(const WebRtc_Word64 ticks)
+{
+#if _WIN32
+    #ifdef USE_QUERY_PERFORMANCE_COUNTER
+        LARGE_INTEGER qpfreq;
+        QueryPerformanceFrequency(&qpfreq);
+        return (ticks * 1000) / qpfreq.QuadPart;
+    #else
+        return ticks;
+    #endif
+#elif WEBRTC_LINUX
+    return ticks / 1000000LL;
+#else
+    return ticks / 1000LL;
+#endif
+}
+
+inline TickTime& TickTime::operator+=(const WebRtc_Word64& ticks)
+{
+    _ticks += ticks;
+    return *this;
+}
+
+inline TickInterval::TickInterval() : _interval(0)
+{
+}
+
+inline TickInterval::TickInterval(const WebRtc_Word64 interval)
+    : _interval(interval)
+{
+}
+
+inline WebRtc_Word64 TickInterval::Milliseconds() const
+{
+#if _WIN32
+    #ifdef USE_QUERY_PERFORMANCE_COUNTER
+        LARGE_INTEGER qpfreq;
+        QueryPerformanceFrequency(&qpfreq);
+        return (_interval * 1000) / qpfreq.QuadPart;
+    #else
+	// _interval is in ms
+        return _interval;
+    #endif
+#elif WEBRTC_LINUX
+    // _interval is in ns
+    return _interval / 1000000;
+#else
+    // _interval is usecs
+    return _interval / 1000;
+#endif
+}
+
+inline WebRtc_Word64 TickInterval::Microseconds() const
+{
+#if _WIN32
+    #ifdef USE_QUERY_PERFORMANCE_COUNTER
+        LARGE_INTEGER qpfreq;
+        QueryPerformanceFrequency(&qpfreq);
+        return (_interval * 1000000) / qpfreq.QuadPart;
+    #else
+	// _interval is in ms
+        return _interval *1000LL;
+    #endif
+#elif WEBRTC_LINUX
+    // _interval is in ns
+    return _interval / 1000;
+#else
+    // _interval is usecs
+    return _interval;
+#endif
+}
+
+inline TickInterval& TickInterval::operator+=(const TickInterval& rhs)
+{
+    _interval += rhs._interval;
+    return *this;
+}
+
+inline TickInterval& TickInterval::operator-=(const TickInterval& rhs)
+{
+    _interval -= rhs._interval;
+    return *this;
+}
+} // namespace webrtc
+
+#endif // WEBRTC_SYSTEM_WRAPPERS_INTERFACE_TICK_UTIL_H_

system_wrappers/interface/trace.h

@@ -0,0 +1,83 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+// System independant wrapper for logging runtime information to file.
+// Note: All log messages will be written to the same trace file.
+// Note: If to many messages are written to file there will be a build up of
+//       messages. Apply filtering to avoid that.
+#ifndef WEBRTC_SYSTEM_WRAPPERS_INTERFACE_TRACE_H_
+#define WEBRTC_SYSTEM_WRAPPERS_INTERFACE_TRACE_H_
+
+#include "common_types.h"
+#include "typedefs.h"
+
+#ifdef WEBRTC_NO_TRACE
+    #define WEBRTC_TRACE
+#else
+    // Ideally we would use __VA_ARGS__ but it's not supported by all compilers
+    // such as VS2003 (it's supported in VS2005). TODO (hellner) why
+    // would this be better than current implementation (not convinced)?
+    #define WEBRTC_TRACE Trace::Add
+#endif
+
+namespace webrtc {
+class Trace
+{
+public:
+
+    // Increments the reference count to the trace.
+    static void CreateTrace();
+    // Decrements the reference count to the trace.
+    static void ReturnTrace();
+    // Note: any instance that writes to the trace file should increment and
+    // decrement the reference count on construction and destruction
+    // respectively
+
+    // Specifies what type of messages should be written to the trace file. The
+    // filter parameter is a bitmask where each message type is enumerated by
+    // the TraceLevel enumerator. TODO (hellner) why is the
+    // TraceLevel enumerator not defined in this file?
+    static WebRtc_Word32 SetLevelFilter(const WebRtc_UWord32 filter);
+
+    // Returns what type of messages are written to the trace file.
+    static WebRtc_Word32 LevelFilter(WebRtc_UWord32& filter);
+
+    // Sets the file name. If addFileCounter is false the same file will be
+    // reused when it fills up. If it's true a new file with incremented name
+    // will be used.
+    static WebRtc_Word32 SetTraceFile(const WebRtc_Word8* fileName,
+                                      const bool addFileCounter = false);
+
+    // Returns the name of the file that the trace is currently writing to.
+    static WebRtc_Word32 TraceFile(WebRtc_Word8 fileName[1024]);
+
+    // Registers callback to receive trace messages. TODO (hellner)
+    // why not use OutStream instead? Why is TraceCallback not defined in this
+    // file
+    static WebRtc_Word32 SetTraceCallback(TraceCallback* callback);
+
+    // Adds a trace message for writing to file. The message is put in a queue
+    // for writing to file whenever possible for performance reasons. I.e. there
+    // is a crash it is possible that the last, vital logs are not logged yet.
+    // level is the the type of message to log. If that type of messages is
+    // filtered it will not be written to file. module is an identifier for what
+    // part of the code the message is comming.
+    // id is an identifier that should be unique for that set of classes that
+    // are associated (e.g. all instances owned by an engine).
+    // msg and the elipsis are the same as e.g. sprintf.
+    // TODO (hellner) Why is TraceModule not defined in this file?
+    static void Add(const TraceLevel level,
+                    const TraceModule module,
+                    const WebRtc_Word32 id,
+                    const char* msg, ...);
+
+};
+} // namespace webrtc
+#endif // WEBRTC_SYSTEM_WRAPPERS_INTERFACE_TRACE_H_

system_wrappers/source/aligned_malloc.cc

@@ -0,0 +1,121 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "aligned_malloc.h"
+
+#include <assert.h>
+#include <memory.h>
+
+#ifdef ANDROID
+#include <stdlib.h>
+#endif
+
+#if WEBRTC_MAC
+  #include <malloc/malloc.h>
+#else
+  #include <malloc.h>
+#endif
+
+#if _WIN32
+    #include <windows.h>
+#else
+    #include <stdint.h>
+#endif
+
+#include "typedefs.h"
+
+// Ok reference on memory alignment:
+// http://stackoverflow.com/questions/227897/solve-the-memory-alignment-in-c-interview-question-that-stumped-me
+
+namespace webrtc
+{
+// TODO (hellner) better to create just one memory block and
+//                           interpret the first sizeof(AlignedMemory) bytes as
+//                           an AlignedMemory struct.
+struct AlignedMemory
+{
+  void* alignedBuffer;
+  void* memoryPointer;
+};
+
+void* AlignedMalloc(size_t size, size_t alignment)
+{
+    if(alignment == 0)
+    {
+        // Don't allow alignment 0 since it's undefined.
+        return NULL;
+    }
+    // Make sure that the alignment is an integer power of two or fail.
+    if(alignment & (alignment - 1))
+    {
+        return NULL;
+    }
+
+    AlignedMemory* returnValue = new AlignedMemory();
+    if(returnValue == NULL)
+    {
+        return NULL;
+    }
+
+    // The memory is aligned towards the lowest address that so only
+    // alignment - 1 bytes needs to be allocated.
+    // A pointer to AlignedMemory must be stored so that it can be retreived for
+    // deletion, ergo the sizeof(uintptr_t).
+    returnValue->memoryPointer = malloc(size + sizeof(uintptr_t) +
+                                        alignment - 1);
+    if(returnValue->memoryPointer == NULL)
+    {
+        delete returnValue;
+        return NULL;
+    }
+
+    // Alligning after the sizeof(header) bytes will leave room for the header
+    // in the same memory block.
+    uintptr_t alignStartPos = (uintptr_t)returnValue->memoryPointer;
+    alignStartPos += sizeof(uintptr_t);
+
+    // The buffer should be aligned with 'alignment' bytes. The - 1 guarantees
+    // that we align towards the lowest address.
+    uintptr_t alignedPos = (alignStartPos + alignment - 1) & ~(alignment - 1);
+
+    // alignedPos is the address sought for.
+    returnValue->alignedBuffer = (void*)alignedPos;
+
+    // Store the address to the AlignedMemory struct in the header so that a
+    // it's possible to reclaim all memory.
+    uintptr_t headerPos = alignedPos;
+    headerPos -= sizeof(uintptr_t);
+    void* headerPtr = (void*) headerPos;
+    uintptr_t headerValue = (uintptr_t)returnValue;
+    memcpy(headerPtr,&headerValue,sizeof(uintptr_t));
+
+    return returnValue->alignedBuffer;
+}
+
+void AlignedFree(void* memBlock)
+{
+    if(memBlock == NULL)
+    {
+        return;
+    }
+    uintptr_t alignedPos = (uintptr_t)memBlock;
+    uintptr_t headerPos = alignedPos - sizeof(uintptr_t);
+
+    // Read out the address of the AlignedMemory struct from the header.
+    uintptr_t* headerPtr = (uintptr_t*)headerPos;
+    AlignedMemory* deleteMemory = (AlignedMemory*) *headerPtr;
+
+    if(deleteMemory->memoryPointer != NULL)
+    {
+        free(deleteMemory->memoryPointer);
+    }
+    delete deleteMemory;
+}
+} // namespace webrtc

system_wrappers/source/atomic32.cc

@@ -0,0 +1,84 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "atomic32_wrapper.h"
+
+#if defined(_WIN32)
+    #include "atomic32_windows.h"
+#elif defined(WEBRTC_LINUX)
+    #include "atomic32_linux.h"
+#elif defined(WEBRTC_MAC)
+    #include "atomic32_mac.h"
+#else
+    #error unsupported os!
+#endif
+
+namespace webrtc {
+Atomic32Wrapper::Atomic32Wrapper(WebRtc_Word32 initialValue)
+    : _impl(*new Atomic32Impl(initialValue))
+{
+}
+
+Atomic32Wrapper::~Atomic32Wrapper()
+{
+    delete &_impl;
+}
+
+WebRtc_Word32 Atomic32Wrapper::operator++()
+{
+    return ++_impl;
+}
+
+WebRtc_Word32 Atomic32Wrapper::operator--()
+{
+    return --_impl;
+}
+
+// Read and write to properly aligned variables are atomic operations.
+// Ex reference (for Windows): http://msdn.microsoft.com/en-us/library/ms684122(v=VS.85).aspx
+// TODO (hellner) operator= and Atomic32Wrapper::Value() can be fully
+// implemented here.
+Atomic32Wrapper& Atomic32Wrapper::operator=(const Atomic32Wrapper& rhs)
+{
+    if(this == &rhs)
+    {
+        return *this;
+    }
+    _impl = rhs._impl;
+    return *this;
+}
+
+Atomic32Wrapper& Atomic32Wrapper::operator=(WebRtc_Word32 rhs)
+{
+    _impl = rhs;
+    return *this;
+}
+
+WebRtc_Word32 Atomic32Wrapper::operator+=(WebRtc_Word32 rhs)
+{
+    return _impl += rhs;
+}
+
+WebRtc_Word32 Atomic32Wrapper::operator-=(WebRtc_Word32 rhs)
+{
+    return _impl -= rhs;
+}
+
+bool Atomic32Wrapper::CompareExchange(WebRtc_Word32 newValue,
+                                      WebRtc_Word32 compareValue)
+{
+    return _impl.CompareExchange(newValue,compareValue);
+}
+
+WebRtc_Word32 Atomic32Wrapper::Value() const
+{
+    return _impl.Value();
+}
+} // namespace webrtc

system_wrappers/source/atomic32_linux.h

@@ -0,0 +1,119 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+// Atomic system independant 32-bit signed integer.
+// Linux implementation.
+// Note: Requires gcc 4.1.2 or later.
+#ifndef WEBRTC_SYSTEM_WRAPPERS_SOURCE_ATOMIC32_LINUX_H_
+#define WEBRTC_SYSTEM_WRAPPERS_SOURCE_ATOMIC32_LINUX_H_
+
+#include <inttypes.h>
+#include <malloc.h>
+
+#include "common_types.h"
+
+namespace webrtc {
+class Atomic32Impl
+{
+public:
+    inline Atomic32Impl(WebRtc_Word32 initialValue);
+    inline ~Atomic32Impl();
+
+    inline WebRtc_Word32 operator++();
+    inline WebRtc_Word32 operator--();
+
+    inline Atomic32Impl& operator=(const Atomic32Impl& rhs);
+    inline Atomic32Impl& operator=(WebRtc_Word32 rhs);
+    inline WebRtc_Word32 operator+=(WebRtc_Word32 rhs);
+    inline WebRtc_Word32 operator-=(WebRtc_Word32 rhs);
+
+    inline bool CompareExchange(WebRtc_Word32 newValue,
+                                WebRtc_Word32 compareValue);
+
+    inline WebRtc_Word32 Value() const;
+private:
+    void*        _ptrMemory;
+    // Volatile ensures full memory barriers.
+    volatile WebRtc_Word32* _value;
+};
+
+// TODO (hellner) use aligned_malloc instead of doing it manually.
+inline Atomic32Impl::Atomic32Impl(WebRtc_Word32 initialValue)
+    : _ptrMemory(NULL),
+      _value(NULL)
+{   // Align the memory associated with _value on a 32-bit boundary. This is a
+    // requirement for the used Linux APIs to be atomic.
+    // Keep _ptrMemory to be able to reclaim memory.
+    _ptrMemory = malloc(sizeof(WebRtc_Word32)*2);
+    _value = (WebRtc_Word32*) (((uintptr_t)_ptrMemory+3)&(~0x3));
+    *_value = initialValue;
+}
+
+inline Atomic32Impl::~Atomic32Impl()
+{
+    if(_ptrMemory != NULL)
+    {
+        free(_ptrMemory);
+    }
+}
+
+inline WebRtc_Word32 Atomic32Impl::operator++()
+{
+    WebRtc_Word32 returnValue = __sync_fetch_and_add(_value,1);
+    returnValue++;
+    return returnValue;
+}
+
+inline WebRtc_Word32 Atomic32Impl::operator--()
+{
+    WebRtc_Word32 returnValue = __sync_fetch_and_sub(_value,1);
+    returnValue--;
+    return returnValue;
+}
+
+inline Atomic32Impl& Atomic32Impl::operator=(const Atomic32Impl& rhs)
+{
+    *_value = *rhs._value;
+    return *this;
+}
+
+inline Atomic32Impl& Atomic32Impl::operator=(WebRtc_Word32 rhs)
+{
+    *_value = rhs;
+    return *this;
+}
+
+inline WebRtc_Word32 Atomic32Impl::operator+=(WebRtc_Word32 rhs)
+{
+    WebRtc_Word32 returnValue = __sync_fetch_and_add(_value,rhs);
+    returnValue += rhs;
+    return returnValue;
+}
+
+inline WebRtc_Word32 Atomic32Impl::operator-=(WebRtc_Word32 rhs)
+{
+    WebRtc_Word32 returnValue = __sync_fetch_and_sub(_value,rhs);
+    returnValue -= rhs;
+    return returnValue;
+}
+
+inline bool Atomic32Impl::CompareExchange(WebRtc_Word32 newValue,
+                                          WebRtc_Word32 compareValue)
+{
+    return __sync_bool_compare_and_swap(_value,compareValue,newValue);
+}
+
+inline WebRtc_Word32 Atomic32Impl::Value() const
+{
+    return *_value;
+}
+} // namespace webrtc
+
+#endif // WEBRTC_SYSTEM_WRAPPERS_SOURCE_ATOMIC32_LINUX_H_

system_wrappers/source/atomic32_mac.h

@@ -0,0 +1,117 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+// Atomic system independant 32-bit signed integer.
+// Mac implementation.
+#ifndef WEBRTC_SYSTEM_WRAPPERS_SOURCE_ATOMIC32_MAC_H_
+#define WEBRTC_SYSTEM_WRAPPERS_SOURCE_ATOMIC32_MAC_H_
+
+#include <stdlib.h>
+#include <libkern/OSAtomic.h>
+
+#include "common_types.h"
+
+namespace webrtc {
+class Atomic32Impl
+{
+public:
+    inline Atomic32Impl(WebRtc_Word32 initialValue);
+    inline ~Atomic32Impl();
+
+    inline WebRtc_Word32 operator++();
+    inline WebRtc_Word32 operator--();
+
+    inline Atomic32Impl& operator=(const Atomic32Impl& rhs);
+    inline Atomic32Impl& operator=(WebRtc_Word32 rhs);
+    inline WebRtc_Word32 operator+=(WebRtc_Word32 rhs);
+    inline WebRtc_Word32 operator-=(WebRtc_Word32 rhs);
+
+    inline bool CompareExchange(WebRtc_Word32 newValue,
+                                WebRtc_Word32 compareValue);
+
+    inline WebRtc_Word32 Value() const;
+private:
+    void*        _ptrMemory;
+    // Volatile ensures full memory barriers.
+    volatile WebRtc_Word32* _value;
+};
+
+// TODO (hellner) use aligned_malloc instead of doing it manually.
+inline Atomic32Impl::Atomic32Impl(WebRtc_Word32 initialValue)
+    :
+    _ptrMemory(NULL),
+    _value(NULL)
+{   // Align the memory associated with _value on a 32-bit boundary. This is a
+    // requirement for the used Mac APIs to be atomic.
+    // Keep _ptrMemory to be able to reclaim memory.
+    _ptrMemory = malloc(sizeof(WebRtc_Word32)*2);
+    _value = (WebRtc_Word32*) (((uintptr_t)_ptrMemory+3)&(~0x3));
+    *_value = initialValue;
+}
+
+inline Atomic32Impl::~Atomic32Impl()
+{
+    if(_ptrMemory != NULL)
+    {
+        free(_ptrMemory);
+    }
+}
+
+inline WebRtc_Word32 Atomic32Impl::operator++()
+{
+    return OSAtomicIncrement32Barrier(
+               reinterpret_cast<volatile int32_t*>(_value));
+}
+
+inline WebRtc_Word32 Atomic32Impl::operator--()
+{
+    return OSAtomicDecrement32Barrier(
+               reinterpret_cast<volatile int32_t*>(_value));
+}
+
+inline Atomic32Impl& Atomic32Impl::operator=(const Atomic32Impl& rhs)
+{
+    *_value = *rhs._value;
+    return *this;
+}
+
+inline Atomic32Impl& Atomic32Impl::operator=(WebRtc_Word32 rhs)
+{
+    *_value = rhs;
+    return *this;
+}
+
+inline WebRtc_Word32 Atomic32Impl::operator+=(WebRtc_Word32 rhs)
+{
+    return OSAtomicAdd32Barrier(rhs,
+                                reinterpret_cast<volatile int32_t*>(_value));
+}
+
+inline WebRtc_Word32 Atomic32Impl::operator-=(WebRtc_Word32 rhs)
+{
+    return OSAtomicAdd32Barrier(-rhs,
+                                reinterpret_cast<volatile int32_t*>(_value));
+}
+
+inline bool Atomic32Impl::CompareExchange(WebRtc_Word32 newValue,
+                                          WebRtc_Word32 compareValue)
+{
+    return OSAtomicCompareAndSwap32Barrier(
+               compareValue,
+               newValue,
+               reinterpret_cast<volatile int32_t*>(_value));
+}
+
+inline WebRtc_Word32 Atomic32Impl::Value() const
+{
+    return *_value;
+}
+} // namespace webrtc
+#endif // WEBRTC_SYSTEM_WRAPPERS_SOURCE_ATOMIC32_MAC_H_

system_wrappers/source/atomic32_windows.h

@@ -0,0 +1,113 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+// Atomic system independant 32-bit signed integer.
+// Windows implementation.
+#ifndef WEBRTC_SYSTEM_WRAPPERS_SOURCE_ATOMIC32_WINDOWS_H_
+#define WEBRTC_SYSTEM_WRAPPERS_SOURCE_ATOMIC32_WINDOWS_H_
+
+#include <malloc.h>
+#include <windows.h>
+
+#include "common_types.h"
+
+namespace webrtc {
+class Atomic32Impl
+{
+public:
+    inline Atomic32Impl(WebRtc_Word32 initialValue);
+    inline ~Atomic32Impl();
+
+    inline WebRtc_Word32 operator++();
+    inline WebRtc_Word32 operator--();
+
+    inline Atomic32Impl& operator=(const Atomic32Impl& rhs);
+    inline Atomic32Impl& operator=(WebRtc_Word32 rhs);
+    inline WebRtc_Word32 operator+=(WebRtc_Word32 rhs);
+    inline WebRtc_Word32 operator-=(WebRtc_Word32 rhs);
+
+    inline bool CompareExchange(WebRtc_Word32 newValue,
+                                WebRtc_Word32 compareValue);
+
+    inline WebRtc_Word32 Value() const;
+private:
+    void* _ptrMemory;
+    // Volatile ensures full memory barriers.
+    volatile LONG* _value;
+};
+
+// TODO (hellner) use aligned_malloc instead of doing it manually.
+inline Atomic32Impl::Atomic32Impl(WebRtc_Word32 initialValue)
+    : _ptrMemory(NULL),
+      _value(NULL)
+{   // Align the memory associated with _value on a 32-bit boundary. This is a
+    // requirement for the used Windows APIs to be atomic.
+    // Keep _ptrMemory to be able to reclaim memory.
+    _ptrMemory = malloc(sizeof(WebRtc_Word32)*2);
+    _value = reinterpret_cast<LONG*> (((uintptr_t)_ptrMemory+3)&(~0x3));
+    *_value = initialValue;
+}
+
+inline Atomic32Impl::~Atomic32Impl()
+{
+    if(_ptrMemory != NULL)
+    {
+         free(_ptrMemory);
+    }
+}
+
+inline WebRtc_Word32 Atomic32Impl::operator++()
+{
+    return (WebRtc_Word32)InterlockedIncrement(_value);
+}
+
+inline WebRtc_Word32 Atomic32Impl::operator--()
+{
+    return (WebRtc_Word32)InterlockedDecrement(_value);
+}
+
+inline Atomic32Impl& Atomic32Impl::operator=(const Atomic32Impl& rhs)
+{
+    *_value = *rhs._value;
+    return *this;
+}
+
+inline Atomic32Impl& Atomic32Impl::operator=(WebRtc_Word32 rhs)
+{
+    *_value = rhs;
+    return *this;
+}
+
+inline WebRtc_Word32 Atomic32Impl::operator+=(WebRtc_Word32 rhs)
+{
+    return InterlockedExchangeAdd(_value,rhs);
+}
+
+inline WebRtc_Word32 Atomic32Impl::operator-=(WebRtc_Word32 rhs)
+{
+    return InterlockedExchangeAdd(_value,-rhs);
+}
+
+inline bool Atomic32Impl::CompareExchange(WebRtc_Word32 newValue,
+                                          WebRtc_Word32 compareValue)
+{
+    const LONG oldValue = InterlockedCompareExchange(_value,newValue,
+                                                     compareValue);
+    // If the old value and the compare value is the same an exchange happened.
+    return (oldValue == compareValue);
+}
+
+inline WebRtc_Word32 Atomic32Impl::Value() const
+{
+    return *_value;
+}
+} // namespace webrtc
+
+#endif // WEBRTC_SYSTEM_WRAPPERS_SOURCE_ATOMIC32_WINDOWS_H_

system_wrappers/source/condition_variable.cc

@@ -0,0 +1,37 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#if defined(_WIN32)
+   #include <windows.h>
+   #include "condition_variable_wrapper.h"
+   #include "condition_variable_windows.h"
+#elif defined(WEBRTC_LINUX)
+   #include <pthread.h>
+   #include "condition_variable_wrapper.h"
+   #include "condition_variable_linux.h"
+#elif defined(WEBRTC_MAC) || defined(WEBRTC_MAC_INTEL)
+   #include <pthread.h>
+   #include "condition_variable_wrapper.h"
+   #include "condition_variable_linux.h"
+ #endif
+
+namespace webrtc {
+ConditionVariableWrapper*
+ConditionVariableWrapper::CreateConditionVariable()
+{
+#if defined(_WIN32)
+    return new ConditionVariableWindows;
+#elif defined(WEBRTC_LINUX) || defined(WEBRTC_MAC) || defined(WEBRTC_MAC_INTEL)
+    return ConditionVariableLinux::Create();
+#else
+    return NULL;
+#endif
+}
+} // namespace webrtc

system_wrappers/source/condition_variable_linux.cc

@@ -0,0 +1,151 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "condition_variable_linux.h"
+
+#if defined(WEBRTC_LINUX)
+#include <ctime>
+#else
+#include <sys/time.h>
+#endif
+
+#include <errno.h>
+
+#include "critical_section_linux.h"
+
+namespace webrtc {
+ConditionVariableWrapper* ConditionVariableLinux::Create()
+{
+    ConditionVariableLinux* ptr = new ConditionVariableLinux;
+    if (!ptr)
+    {
+        return NULL;
+    }
+
+    const int error = ptr->Construct();
+    if (error)
+    {
+        delete ptr;
+        return NULL;
+    }
+
+    return ptr;
+}
+
+ConditionVariableLinux::ConditionVariableLinux()
+{
+}
+
+int ConditionVariableLinux::Construct()
+{
+    int result = 0;
+#ifdef WEBRTC_CLOCK_TYPE_REALTIME
+    result = pthread_cond_init(&_cond, NULL);
+#else
+    pthread_condattr_t condAttr;
+    result = pthread_condattr_init(&condAttr);
+    if (result != 0)
+    {
+        return -1;
+    }
+    result = pthread_condattr_setclock(&condAttr, CLOCK_MONOTONIC);
+    if (result != 0)
+    {
+        return -1;
+    }
+    result = pthread_cond_init(&_cond, &condAttr);
+    if (result != 0)
+    {
+        return -1;
+    }
+    result = pthread_condattr_destroy(&condAttr);
+    if (result != 0)
+    {
+        return -1;
+    }
+#endif
+    return 0;
+}
+
+ConditionVariableLinux::~ConditionVariableLinux()
+{
+    pthread_cond_destroy(&_cond);
+}
+
+void ConditionVariableLinux::SleepCS(CriticalSectionWrapper& critSect)
+{
+    CriticalSectionLinux* cs = reinterpret_cast<CriticalSectionLinux*>(
+                                   &critSect);
+    pthread_cond_wait(&_cond, &cs->_mutex);
+}
+
+
+bool
+ConditionVariableLinux::SleepCS(
+    CriticalSectionWrapper& critSect,
+    unsigned long maxTimeInMS)
+{
+    const unsigned long INFINITE =  0xFFFFFFFF;
+
+    const int MILLISECONDS_PER_SECOND      = 1000;
+#ifndef WEBRTC_LINUX
+    const int MICROSECONDS_PER_MILLISECOND = 1000;
+#endif
+    const int NANOSECONDS_PER_SECOND       = 1000000000;
+    const int NANOSECONDS_PER_MILLISECOND  = 1000000;
+
+    CriticalSectionLinux* cs = reinterpret_cast<CriticalSectionLinux*>(
+                                   &critSect);
+
+    if (maxTimeInMS != INFINITE)
+    {
+        timespec ts;
+#ifndef WEBRTC_MAC
+#ifdef WEBRTC_CLOCK_TYPE_REALTIME
+        clock_gettime(CLOCK_REALTIME, &ts);
+#else
+        clock_gettime(CLOCK_MONOTONIC, &ts);
+#endif
+#else
+        struct timeval tv;
+        gettimeofday(&tv, 0);
+        ts.tv_sec  = tv.tv_sec;
+        ts.tv_nsec = tv.tv_usec * MICROSECONDS_PER_MILLISECOND;
+#endif
+
+        ts.tv_sec += maxTimeInMS / MILLISECONDS_PER_SECOND;
+        ts.tv_nsec += (maxTimeInMS - ((maxTimeInMS / MILLISECONDS_PER_SECOND)*
+                      MILLISECONDS_PER_SECOND)) * NANOSECONDS_PER_MILLISECOND;
+
+        if (ts.tv_nsec >= NANOSECONDS_PER_SECOND)
+        {
+            ts.tv_sec += ts.tv_nsec / NANOSECONDS_PER_SECOND;
+            ts.tv_nsec %= NANOSECONDS_PER_SECOND;
+        }
+        const int res = pthread_cond_timedwait(&_cond, &cs->_mutex, &ts);
+        return (res == ETIMEDOUT) ? false : true;
+    }
+    else
+    {
+        pthread_cond_wait(&_cond, &cs->_mutex);
+        return true;
+    }
+}
+
+void ConditionVariableLinux::Wake()
+{
+    pthread_cond_signal(&_cond);
+}
+
+void ConditionVariableLinux::WakeAll()
+{
+    pthread_cond_broadcast(&_cond);
+}
+} // namespace webrtc

system_wrappers/source/condition_variable_linux.h

@@ -0,0 +1,39 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_SYSTEM_WRAPPERS_SOURCE_CONDITION_VARIABLE_LINUX_H_
+#define WEBRTC_SYSTEM_WRAPPERS_SOURCE_CONDITION_VARIABLE_LINUX_H_
+
+#include "condition_variable_wrapper.h"
+
+#include <pthread.h>
+
+namespace webrtc {
+class ConditionVariableLinux : public ConditionVariableWrapper
+{
+public:
+    static ConditionVariableWrapper* Create();
+    ~ConditionVariableLinux();
+
+    void SleepCS(CriticalSectionWrapper& critSect);
+    bool SleepCS(CriticalSectionWrapper& critSect, unsigned long maxTimeInMS);
+    void Wake();
+    void WakeAll();
+
+private:
+    ConditionVariableLinux();
+    int Construct();
+
+private:
+    pthread_cond_t _cond;
+};
+} // namespace webrtc
+
+#endif // WEBRTC_SYSTEM_WRAPPERS_SOURCE_CONDITION_VARIABLE_LINUX_H_

system_wrappers/source/condition_variable_windows.cc

@@ -0,0 +1,224 @@
+/*
+ *  Use of this source code is governed by the ACE copyright license which
+ *  can be found in the LICENSE file in the third_party_mods/ace directory of
+ *  the source tree or at http://www1.cse.wustl.edu/~schmidt/ACE-copying.html.
+ */
+/*
+ *  This source code contain modifications to the original source code
+ *  which can be found here:
+ *  http://www.cs.wustl.edu/~schmidt/win32-cv-1.html (section 3.2).
+ *  Modifications:
+ *  1) Dynamic detection of native support for condition variables.
+ *  2) Use of WebRTC defined types and classes. Renaming of some functions.
+ *  3) Introduction of a second event for wake all functionality. This prevents
+ *     a thread from spinning on the same condition variable, preventing other
+ *     threads from waking up.
+ */
+
+// TODO (hellner): probably nicer to split up native and generic
+// implementation into two different files
+
+#include "condition_variable_windows.h"
+
+#include "critical_section_windows.h"
+#include "trace.h"
+
+namespace webrtc {
+bool ConditionVariableWindows::_winSupportConditionVariablesPrimitive = false;
+static HMODULE library = NULL;
+
+PInitializeConditionVariable  _PInitializeConditionVariable;
+PSleepConditionVariableCS     _PSleepConditionVariableCS;
+PWakeConditionVariable        _PWakeConditionVariable;
+PWakeAllConditionVariable     _PWakeAllConditionVariable;
+
+typedef void (WINAPI *PInitializeConditionVariable)(PCONDITION_VARIABLE);
+typedef BOOL (WINAPI *PSleepConditionVariableCS)(PCONDITION_VARIABLE,
+                                                 PCRITICAL_SECTION, DWORD);
+typedef void (WINAPI *PWakeConditionVariable)(PCONDITION_VARIABLE);
+typedef void (WINAPI *PWakeAllConditionVariable)(PCONDITION_VARIABLE);
+
+ConditionVariableWindows::ConditionVariableWindows()
+    : _eventID(WAKEALL_0)
+{
+    if (!library)
+    {
+        // Use native implementation if supported (i.e Vista+)
+        library = LoadLibrary(TEXT("Kernel32.dll"));
+        if (library)
+        {
+            WEBRTC_TRACE(kTraceStateInfo, kTraceUtility, -1,
+                         "Loaded Kernel.dll");
+
+            _PInitializeConditionVariable =
+                (PInitializeConditionVariable) GetProcAddress(
+                    library,
+                    "InitializeConditionVariable");
+            _PSleepConditionVariableCS =
+                (PSleepConditionVariableCS)GetProcAddress(
+                    library,
+                    "SleepConditionVariableCS");
+            _PWakeConditionVariable =
+                (PWakeConditionVariable)GetProcAddress(
+                    library,
+                     "WakeConditionVariable");
+            _PWakeAllConditionVariable =
+                (PWakeAllConditionVariable)GetProcAddress(
+                    library,
+                    "WakeAllConditionVariable");
+
+            if(_PInitializeConditionVariable &&
+               _PSleepConditionVariableCS &&
+               _PWakeConditionVariable &&
+               _PWakeAllConditionVariable)
+            {
+                WEBRTC_TRACE(kTraceStateInfo, kTraceUtility, -1,
+                             "Loaded native condition variables");
+                _winSupportConditionVariablesPrimitive = true;
+            }
+        }
+    }
+
+    if (_winSupportConditionVariablesPrimitive)
+    {
+        _PInitializeConditionVariable(&_conditionVariable);
+
+        _events[WAKEALL_0] = NULL;
+        _events[WAKEALL_1] = NULL;
+        _events[WAKE] = NULL;
+
+    } else {
+        memset(&_numWaiters[0],0,sizeof(_numWaiters));
+
+        InitializeCriticalSection(&_numWaitersCritSect);
+
+        _events[WAKEALL_0] = CreateEvent(NULL,  // no security attributes
+                                         TRUE,  // manual-reset, sticky event
+                                         FALSE, // initial state non-signaled
+                                         NULL); // no name for event
+
+        _events[WAKEALL_1] = CreateEvent(NULL,  // no security attributes
+                                         TRUE,  // manual-reset, sticky event
+                                         FALSE, // initial state non-signaled
+                                         NULL); // no name for event
+
+        _events[WAKE] = CreateEvent(NULL,  // no security attributes
+                                    FALSE, // auto-reset, sticky event
+                                    FALSE, // initial state non-signaled
+                                    NULL); // no name for event
+    }
+}
+
+ConditionVariableWindows::~ConditionVariableWindows()
+{
+    if(!_winSupportConditionVariablesPrimitive)
+    {
+        CloseHandle(_events[WAKE]);
+        CloseHandle(_events[WAKEALL_1]);
+        CloseHandle(_events[WAKEALL_0]);
+
+        DeleteCriticalSection(&_numWaitersCritSect);
+    }
+}
+
+void ConditionVariableWindows::SleepCS(CriticalSectionWrapper& critSect)
+{
+    SleepCS(critSect, INFINITE);
+}
+
+bool ConditionVariableWindows::SleepCS(CriticalSectionWrapper& critSect,
+                                       unsigned long maxTimeInMS)
+{
+    CriticalSectionWindows* cs = reinterpret_cast<CriticalSectionWindows*>(
+                                     &critSect);
+
+    if(_winSupportConditionVariablesPrimitive)
+    {
+        BOOL retVal = _PSleepConditionVariableCS(&_conditionVariable,
+                                                 &(cs->crit),maxTimeInMS);
+        return (retVal == 0) ? false : true;
+
+    }else
+    {
+        EnterCriticalSection(&_numWaitersCritSect);
+        // Get the eventID for the event that will be triggered by next
+        // WakeAll() call and start waiting for it.
+        const EventWakeUpType eventID = (WAKEALL_0 == _eventID) ?
+                                            WAKEALL_1 : WAKEALL_0;
+        ++(_numWaiters[eventID]);
+        LeaveCriticalSection(&_numWaitersCritSect);
+
+        LeaveCriticalSection(&cs->crit);
+        HANDLE events[2];
+        events[0] = _events[WAKE];
+        events[1] = _events[eventID];
+        const DWORD result = WaitForMultipleObjects(2, // Wait on 2 events.
+                                                    events,
+                                                    FALSE, // Wait for either.
+                                                    maxTimeInMS);
+
+        const bool retVal = (result != WAIT_TIMEOUT);
+
+        EnterCriticalSection(&_numWaitersCritSect);
+        --(_numWaiters[eventID]);
+        // Last waiter should only be true for WakeAll(). WakeAll() correspond
+        // to position 1 in events[] -> (result == WAIT_OBJECT_0 + 1)
+        const bool lastWaiter = (result == WAIT_OBJECT_0 + 1) &&
+                                (_numWaiters[eventID] == 0);
+        LeaveCriticalSection(&_numWaitersCritSect);
+
+        if (lastWaiter)
+        {
+            // Reset/unset the WakeAll() event since all threads have been
+            // released.
+            ResetEvent(_events[eventID]);
+        }
+
+        EnterCriticalSection(&cs->crit);
+        return retVal;
+    }
+}
+
+void
+ConditionVariableWindows::Wake()
+{
+    if(_winSupportConditionVariablesPrimitive)
+    {
+        _PWakeConditionVariable(&_conditionVariable);
+    }else
+    {
+        EnterCriticalSection(&_numWaitersCritSect);
+        const bool haveWaiters = (_numWaiters[WAKEALL_0] > 0) ||
+                                 (_numWaiters[WAKEALL_1] > 0);
+        LeaveCriticalSection(&_numWaitersCritSect);
+
+        if (haveWaiters)
+        {
+            SetEvent(_events[WAKE]);
+        }
+    }
+}
+
+void
+ConditionVariableWindows::WakeAll()
+{
+    if(_winSupportConditionVariablesPrimitive)
+    {
+        _PWakeAllConditionVariable(&_conditionVariable);
+    }else
+    {
+        EnterCriticalSection(&_numWaitersCritSect);
+        // Update current WakeAll() event
+        _eventID = (WAKEALL_0 == _eventID) ? WAKEALL_1 : WAKEALL_0;
+        // Trigger current event
+        const EventWakeUpType eventID = _eventID;
+        const bool haveWaiters = _numWaiters[eventID] > 0;
+        LeaveCriticalSection(&_numWaitersCritSect);
+
+        if (haveWaiters)
+        {
+            SetEvent(_events[eventID]);
+        }
+    }
+}
+} // namespace webrtc

system_wrappers/source/condition_variable_windows.h

@@ -0,0 +1,67 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_SYSTEM_WRAPPERS_SOURCE_CONDITION_VARIABLE_WINDOWS_H_
+#define WEBRTC_SYSTEM_WRAPPERS_SOURCE_CONDITION_VARIABLE_WINDOWS_H_
+
+#include "condition_variable_wrapper.h"
+
+#include <windows.h>
+
+namespace webrtc {
+#if !defined CONDITION_VARIABLE_INIT
+    typedef struct _RTL_CONDITION_VARIABLE
+    {
+        void* Ptr;
+    } RTL_CONDITION_VARIABLE, *PRTL_CONDITION_VARIABLE;
+
+    typedef RTL_CONDITION_VARIABLE CONDITION_VARIABLE, *PCONDITION_VARIABLE;
+#endif
+
+typedef void (WINAPI *PInitializeConditionVariable)(PCONDITION_VARIABLE);
+typedef BOOL (WINAPI *PSleepConditionVariableCS)(PCONDITION_VARIABLE,
+                                                 PCRITICAL_SECTION, DWORD);
+typedef void (WINAPI *PWakeConditionVariable)(PCONDITION_VARIABLE);
+typedef void (WINAPI *PWakeAllConditionVariable)(PCONDITION_VARIABLE);
+
+
+class ConditionVariableWindows : public ConditionVariableWrapper
+{
+public:
+    ConditionVariableWindows();
+    ~ConditionVariableWindows();
+
+    void SleepCS(CriticalSectionWrapper& critSect);
+    bool SleepCS(CriticalSectionWrapper& critSect, unsigned long maxTimeInMS);
+    void Wake();
+    void WakeAll();
+
+private:
+    enum EventWakeUpType
+    {
+        WAKEALL_0   = 0,
+        WAKEALL_1   = 1,
+        WAKE        = 2,
+        EVENT_COUNT = 3
+    };
+
+private:
+    // Native support for Windows Vista+
+    static bool              _winSupportConditionVariablesPrimitive;
+    CONDITION_VARIABLE       _conditionVariable;
+
+    unsigned int     _numWaiters[2];
+    EventWakeUpType  _eventID;
+    CRITICAL_SECTION _numWaitersCritSect;
+    HANDLE           _events[EVENT_COUNT];
+};
+} // namespace webrtc
+
+#endif // WEBRTC_SYSTEM_WRAPPERS_SOURCE_CONDITION_VARIABLE_WINDOWS_H_

system_wrappers/source/cpu.cc

@@ -0,0 +1,87 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "cpu_wrapper.h"
+
+#if defined(_WIN32)
+    #include <Windows.h>
+    #include "engine_configurations.h"
+    #include "cpu_windows.h"
+#elif defined(WEBRTC_MAC)
+    #include <sys/types.h>
+    #include <sys/sysctl.h>
+    #include "cpu_mac.h"
+#elif defined(WEBRTC_MAC_INTEL)
+    #include "cpu_mac.h"
+#elif defined(ANDROID)
+    // Not implemented yet, might be possible to use Linux implementation
+#else // defined(WEBRTC_LINUX)
+    #include <sys/sysinfo.h>
+    #include "cpu_linux.h"
+#endif
+
+#include "trace.h"
+
+namespace webrtc {
+WebRtc_UWord32 CpuWrapper::_numberOfCores = 0;
+
+WebRtc_UWord32 CpuWrapper::DetectNumberOfCores()
+{
+    if (!_numberOfCores)
+    {
+#if defined(_WIN32)
+        SYSTEM_INFO si;
+        GetSystemInfo(&si);
+        _numberOfCores = static_cast<WebRtc_UWord32>(si.dwNumberOfProcessors);
+        WEBRTC_TRACE(kTraceStateInfo, kTraceUtility, -1,
+                     "Available number of cores:%d", _numberOfCores);
+
+#elif defined(WEBRTC_LINUX) && !defined(ANDROID)
+        _numberOfCores = get_nprocs();
+        WEBRTC_TRACE(kTraceStateInfo, kTraceUtility, -1,
+                     "Available number of cores:%d", _numberOfCores);
+
+#elif (defined(WEBRTC_MAC) || defined(WEBRTC_MAC_INTEL))
+        int name[] = {CTL_HW, HW_AVAILCPU};
+        int ncpu;
+        size_t size = sizeof(ncpu);
+        if(0 == sysctl(name, 2, &ncpu, &size, NULL, 0))
+        {
+            _numberOfCores = static_cast<WebRtc_UWord32>(ncpu);
+            WEBRTC_TRACE(kTraceStateInfo, kTraceUtility, -1,
+                         "Available number of cores:%d", _numberOfCores);
+    } else
+    {
+            WEBRTC_TRACE(kTraceError, kTraceUtility, -1,
+                         "Failed to get number of cores");
+            _numberOfCores = 1;
+    }
+#else
+        WEBRTC_TRACE(kTraceWarning, kTraceUtility, -1,
+                     "No function to get number of cores");
+        _numberOfCores = 1;
+#endif
+    }
+    return _numberOfCores;
+}
+
+CpuWrapper* CpuWrapper::CreateCpu()
+{
+#if defined(_WIN32)
+   return new CpuWindows();
+#elif (defined(WEBRTC_MAC) || defined(WEBRTC_MAC_INTEL))
+    return new CpuWrapperMac();
+#elif defined(ANDROID)
+    return 0;
+#else
+    return new CpuLinux();
+#endif
+}
+} // namespace webrtc

system_wrappers/source/cpu_features.cc

@@ -0,0 +1,60 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "cpu_features_wrapper.h"
+
+// No CPU feature is available => straight C path.
+int GetCPUInfoNoASM(CPUFeature feature) {
+  (void)feature;
+  return 0;
+}
+
+// Intrinsic for "cpuid".
+#if defined(__pic__) && defined(__i386__)
+static inline void cpuid(int cpu_info[4], int info_type) {
+  __asm__ volatile (
+    "mov %%ebx, %%edi\n"
+    "cpuid\n"
+    "xchg %%edi, %%ebx\n"
+    : "=a"(cpu_info[0]), "=D"(cpu_info[1]), "=c"(cpu_info[2]), "=d"(cpu_info[3])
+    : "a"(info_type));
+}
+#elif defined(__i386__) || defined(__x86_64__)
+static inline void cpuid(int cpu_info[4], int info_type) {
+  __asm__ volatile (
+    "cpuid\n"
+    : "=a"(cpu_info[0]), "=b"(cpu_info[1]), "=c"(cpu_info[2]), "=d"(cpu_info[3])
+    : "a"(info_type));
+}
+#endif
+
+#if defined(__i386__) || defined(__x86_64__)
+// Actual feature detection for x86.
+static int GetCPUInfo(CPUFeature feature) {
+  int cpu_info[4];
+  cpuid(cpu_info, 1);
+  if (feature == kSSE2) {
+    return 0 != (cpu_info[3] & 0x04000000);
+  }
+  if (feature == kSSE3) {
+    return 0 != (cpu_info[2] & 0x00000001);
+  }
+  return 0;
+}
+#else
+// Default to straight C for other platforms.
+static int GetCPUInfo(CPUFeature feature) {
+  (void)feature;
+  return 0;
+}
+#endif
+
+WebRtc_CPUInfo WebRtc_GetCPUInfo = GetCPUInfo;
+WebRtc_CPUInfo WebRtc_GetCPUInfoNoASM = GetCPUInfoNoASM;

system_wrappers/source/cpu_linux.cc

@@ -0,0 +1,168 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "cpu_linux.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+namespace webrtc {
+CpuLinux::CpuLinux()
+{
+    m_oldBusyTime = 0;
+    m_oldIdleTime = 0;
+    m_numCores = 0;
+    m_numCores = GetNumCores();
+    m_oldBusyTimeMulti = new long long[m_numCores];
+    m_oldIdleTimeMulti = new long long[m_numCores];
+    m_idleArray = new long long[m_numCores];
+    m_busyArray = new long long[m_numCores];
+    m_resultArray = new WebRtc_UWord32[m_numCores];
+
+    GetData(m_oldBusyTime, m_oldIdleTime, m_busyArray, m_idleArray);
+}
+
+CpuLinux::~CpuLinux()
+{
+    delete [] m_oldBusyTimeMulti;
+    delete [] m_oldIdleTimeMulti;
+    delete [] m_idleArray;
+    delete [] m_busyArray;
+    delete [] m_resultArray;
+}
+
+WebRtc_Word32 CpuLinux::CpuUsage()
+{
+    WebRtc_UWord32 dummy = 0;
+    WebRtc_UWord32* dummyArray = NULL;
+    return CpuUsageMultiCore(dummy, dummyArray);
+}
+
+WebRtc_Word32 CpuLinux::CpuUsageMultiCore(WebRtc_UWord32& numCores,
+                                          WebRtc_UWord32*& coreArray)
+{
+    coreArray = m_resultArray;
+    numCores = m_numCores;
+    long long busy = 0;
+    long long idle = 0;
+    GetData(busy, idle, m_busyArray, m_idleArray);
+
+    long long deltaBusy = busy - m_oldBusyTime;
+    long long deltaIdle = idle - m_oldIdleTime;
+    m_oldBusyTime = busy;
+    m_oldIdleTime = idle;
+
+    int retVal = -1;
+    if (deltaBusy + deltaIdle == 0)
+    {
+        retVal = 0;
+    }
+    else
+    {
+        retVal = (int)(100 * (deltaBusy) / (deltaBusy + deltaIdle));
+    }
+
+    if (coreArray == NULL)
+    {
+      return retVal;
+    }
+
+    for (WebRtc_UWord32 i = 0; i < m_numCores; i++)
+    {
+        deltaBusy = m_busyArray[i] - m_oldBusyTimeMulti[i];
+        deltaIdle = m_idleArray[i] - m_oldIdleTimeMulti[i];
+        m_oldBusyTimeMulti[i] = m_busyArray[i];
+        m_oldIdleTimeMulti[i] = m_idleArray[i];
+        if(deltaBusy + deltaIdle == 0)
+        {
+            coreArray[i] = 0;
+        }
+        else
+        {
+            coreArray[i] = (int)(100 * (deltaBusy) / (deltaBusy+deltaIdle));
+        }
+    }
+    return retVal;
+}
+
+
+int CpuLinux::GetData(long long& busy, long long& idle, long long*& busyArray,
+                      long long*& idleArray)
+{
+    FILE* fp = fopen("/proc/stat", "r");
+    if (!fp)
+    {
+        return -1;
+    }
+
+    char line[100];
+    char* dummy = fgets(line, 100, fp);
+    char firstWord[100];
+    sscanf(line, "%s ", firstWord);
+    if(strncmp(firstWord, "cpu", 3)!=0)
+    {
+        return -1;
+    }
+    char sUser[100];
+    char sNice[100];
+    char sSystem[100];
+    char sIdle[100];
+    sscanf(line, "%s %s %s %s %s ", firstWord, sUser, sNice, sSystem, sIdle);
+    long long luser = atoll(sUser);
+    long long lnice = atoll(sNice);
+    long long lsystem = atoll(sSystem);
+    long long lidle = atoll (sIdle);
+
+    busy = luser + lnice + lsystem;
+    idle = lidle;
+    for (WebRtc_UWord32 i = 0; i < m_numCores; i++)
+    {
+        dummy = fgets(line, 100, fp);
+        sscanf(line, "%s %s %s %s %s ", firstWord, sUser, sNice, sSystem,
+               sIdle);
+        luser = atoll(sUser);
+        lnice = atoll(sNice);
+        lsystem = atoll(sSystem);
+        lidle = atoll (sIdle);
+        busyArray[i] = luser + lnice + lsystem;
+        idleArray[i] = lidle;
+    }
+    fclose(fp);
+    return 0;
+}
+
+int CpuLinux::GetNumCores()
+{
+    FILE* fp = fopen("/proc/stat", "r");
+    if (!fp)
+    {
+        return -1;
+    }
+    // Skip first line
+    char line[100];
+    char* dummy = fgets(line, 100, fp);
+    int numCores = -1;
+    char firstWord[100];
+    do
+    {
+        numCores++;
+        if (fgets(line, 100, fp))
+        {
+            sscanf(line, "%s ", firstWord);
+        } else {
+            break;
+        }
+    } while (strncmp(firstWord, "cpu", 3) == 0);
+    fclose(fp);
+    return numCores;
+}
+} // namespace webrtc

system_wrappers/source/cpu_linux.h

@@ -0,0 +1,51 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_SYSTEM_WRAPPERS_SOURCE_CPU_LINUX_H_
+#define WEBRTC_SYSTEM_WRAPPERS_SOURCE_CPU_LINUX_H_
+
+#include "cpu_wrapper.h"
+
+namespace webrtc {
+class CpuLinux : public CpuWrapper
+{
+public:
+    CpuLinux();
+    virtual ~CpuLinux();
+
+    virtual WebRtc_Word32 CpuUsage();
+    virtual WebRtc_Word32 CpuUsage(WebRtc_Word8* /*pProcessName*/,
+                                   WebRtc_UWord32 /*length*/) {return 0;}
+    virtual WebRtc_Word32 CpuUsage(WebRtc_UWord32 /*dwProcessID*/) {return 0;}
+
+    virtual WebRtc_Word32 CpuUsageMultiCore(WebRtc_UWord32& numCores,
+                                            WebRtc_UWord32*& array);
+
+    virtual void Reset() {return;}
+    virtual void Stop() {return;}
+private:
+    int GetData(long long& busy, long long& idle, long long*& busyArray,
+                long long*& idleArray);
+    int GetNumCores();
+
+    long long m_oldBusyTime;
+    long long m_oldIdleTime;
+
+    long long* m_oldBusyTimeMulti;
+    long long* m_oldIdleTimeMulti;
+
+    long long* m_idleArray;
+    long long* m_busyArray;
+    WebRtc_UWord32* m_resultArray;
+    WebRtc_UWord32  m_numCores;
+};
+} // namespace webrtc
+
+#endif // WEBRTC_SYSTEM_WRAPPERS_SOURCE_CPU_LINUX_H_

system_wrappers/source/cpu_mac.cc

@@ -0,0 +1,132 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "cpu_mac.h"
+
+#include <iostream>
+#include <mach/mach.h>
+#include <mach/mach_error.h>
+
+#include "tick_util.h"
+
+namespace webrtc {
+CpuWrapperMac::CpuWrapperMac() : _cpuUsage(NULL)
+{
+    natural_t cpuCount;
+    processor_info_array_t infoArray;
+    mach_msg_type_number_t infoCount;
+
+    kern_return_t error = host_processor_info(mach_host_self(),
+                                              PROCESSOR_CPU_LOAD_INFO,
+                                              &cpuCount,
+                                              &infoArray,
+                                              &infoCount);
+    if (error)
+    {
+        return;
+    }
+
+    _cpuUsage = new WebRtc_UWord32[cpuCount];
+    _lastTickCount = new WebRtc_Word64[cpuCount];
+    _lastTime = TickTime::MillisecondTimestamp();
+
+    processor_cpu_load_info_data_t* cpuLoadInfo =
+        (processor_cpu_load_info_data_t*) infoArray;
+    for (unsigned int cpu= 0; cpu < cpuCount; cpu++)
+    {
+        WebRtc_Word64 ticks = 0;
+        for (int state = 0; state < 2; state++)
+        {
+            ticks += cpuLoadInfo[cpu].cpu_ticks[state];
+        }
+        _lastTickCount[cpu] = ticks;
+    }
+    vm_deallocate(mach_task_self(), (vm_address_t)infoArray, infoCount);
+}
+
+CpuWrapperMac::~CpuWrapperMac()
+{
+    delete _cpuUsage;
+    delete _lastTickCount;
+}
+
+WebRtc_Word32 CpuWrapperMac::CpuUsage()
+{
+    WebRtc_UWord32 numCores;
+    WebRtc_UWord32* array = NULL;
+    return CpuUsageMultiCore(numCores, array);
+}
+
+WebRtc_Word32
+CpuWrapperMac::CpuUsageMultiCore(WebRtc_UWord32& numCores,
+                                 WebRtc_UWord32*& array)
+{
+    natural_t cpuCount;
+    processor_info_array_t infoArray;
+    mach_msg_type_number_t infoCount;
+
+    // sanity check
+    if(_cpuUsage == NULL)
+    {
+        return -1;
+    }
+    WebRtc_Word64 now = TickTime::MillisecondTimestamp();
+    WebRtc_Word64 timeDiffMS = now - _lastTime;
+    // TODO(hellner) why block here? Why not just return the old
+    //                          value? Is this behavior consistent across all
+    //                          platforms?
+    // Make sure that at least 500 ms pass between calls.
+    if(timeDiffMS < 500)
+    {
+        usleep((500-timeDiffMS)*1000);
+        return CpuUsageMultiCore(numCores, array);
+    }
+    _lastTime = now;
+
+     kern_return_t error = host_processor_info(mach_host_self(),
+                                              PROCESSOR_CPU_LOAD_INFO,
+                                              &cpuCount,
+                                              &infoArray,
+                                              &infoCount);
+    if (error)
+    {
+        return -1;
+    }
+
+    processor_cpu_load_info_data_t* cpuLoadInfo =
+        (processor_cpu_load_info_data_t*) infoArray;
+
+    WebRtc_Word32 totalCpuUsage = 0;
+    for (unsigned int cpu = 0; cpu < cpuCount; cpu++)
+    {
+        WebRtc_Word64 ticks = 0;
+        for (int state = 0; state < 2; state++)
+        {
+            ticks += cpuLoadInfo[cpu].cpu_ticks[state];
+        }
+        if(timeDiffMS <= 0)
+        {
+            _cpuUsage[cpu] = 0;
+        }else {
+            _cpuUsage[cpu] = (WebRtc_UWord32)((1000 *
+                                              (ticks - _lastTickCount[cpu])) /
+                                              timeDiffMS);
+        }
+        _lastTickCount[cpu] = ticks;
+        totalCpuUsage += _cpuUsage[cpu];
+    }
+
+    vm_deallocate(mach_task_self(), (vm_address_t)infoArray, infoCount);
+
+    numCores = cpuCount;
+    array = _cpuUsage;
+    return totalCpuUsage/cpuCount;
+}
+} // namespace webrtc

system_wrappers/source/cpu_mac.h

@@ -0,0 +1,44 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_SYSTEM_WRAPPERS_SOURCE_CPU_MAC_H_
+#define WEBRTC_SYSTEM_WRAPPERS_SOURCE_CPU_MAC_H_
+
+#include "cpu_wrapper.h"
+
+namespace webrtc {
+class CpuWrapperMac : public CpuWrapper
+{
+public:
+    CpuWrapperMac();
+    virtual ~CpuWrapperMac();
+
+    virtual WebRtc_Word32 CpuUsage();
+    virtual WebRtc_Word32 CpuUsage(WebRtc_Word8* /*pProcessName*/,
+                                   WebRtc_UWord32 /*length*/) {return -1;}
+    virtual WebRtc_Word32 CpuUsage(WebRtc_UWord32  /*dwProcessID*/) {return -1;}
+
+    // Note: this class will block the call and sleep if called too fast
+    // This function blocks the calling thread if the thread is calling it more
+    // often than every 500 ms.
+    virtual WebRtc_Word32 CpuUsageMultiCore(WebRtc_UWord32& numCores,
+                                            WebRtc_UWord32*& array);
+
+    virtual void Reset() {}
+    virtual void Stop() {}
+
+private:
+    WebRtc_UWord32* _cpuUsage;
+    WebRtc_Word64*  _lastTickCount;
+    WebRtc_Word64   _lastTime;
+};
+} // namespace webrtc
+
+#endif // WEBRTC_SYSTEM_WRAPPERS_SOURCE_CPU_MAC_H_

system_wrappers/source/cpu_windows.cc

@@ -0,0 +1,501 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "cpu_windows.h"
+
+#define _WIN32_DCOM
+
+#include <assert.h>
+#include <iostream>
+#include <Wbemidl.h>
+
+#pragma comment(lib, "wbemuuid.lib")
+
+#include "condition_variable_wrapper.h"
+#include "critical_section_wrapper.h"
+#include "event_wrapper.h"
+#include "thread_wrapper.h"
+
+namespace webrtc {
+WebRtc_Word32 CpuWindows::CpuUsage()
+{
+    if (!initialized_)
+    {
+        return -1;
+    }
+    // Last element is the average
+    return cpu_usage_[number_of_objects_ - 1];
+}
+
+WebRtc_Word32 CpuWindows::CpuUsageMultiCore(WebRtc_UWord32& num_cores,
+                                                  WebRtc_UWord32*& cpu_usage)
+{
+    if (!initialized_)
+    {
+        return -1;
+    }
+    num_cores = number_of_objects_ - 1;
+    cpu_usage = cpu_usage_;
+    return cpu_usage_[number_of_objects_-1];
+}
+
+CpuWindows::CpuWindows()
+    : cpu_polling_thread(NULL),
+      initialize_(true),
+      initialized_(false),
+      terminate_(false),
+      cpu_usage_(NULL),
+      wbem_enum_access_(NULL),
+      number_of_objects_(0),
+      cpu_usage_handle_(0),
+      previous_processor_timestamp_(NULL),
+      timestamp_sys_100_ns_handle_(0),
+      previous_100ns_timestamp_(NULL),
+      wbem_service_(NULL),
+      wbem_refresher_(NULL),
+      wbem_enum_(NULL)
+{
+    // All resources are allocated in PollingCpu().
+    if (AllocateComplexDataTypes())
+    {
+        const bool success = StartPollingCpu();
+        assert(success);
+    }
+    else
+    {
+        assert(false);
+    }
+}
+
+CpuWindows::~CpuWindows()
+{
+    // All resources are reclaimed in StopPollingCpu().
+    const bool success = StopPollingCpu();
+    assert(success);
+    DeAllocateComplexDataTypes();
+}
+
+bool CpuWindows::AllocateComplexDataTypes()
+{
+    cpu_polling_thread = ThreadWrapper::CreateThread(
+        CpuWindows::Process,
+        reinterpret_cast<void*>(this),
+        kNormalPriority,
+        "CpuWindows");
+    init_crit_ = CriticalSectionWrapper::CreateCriticalSection();
+    init_cond_ = ConditionVariableWrapper::CreateConditionVariable();
+    terminate_crit_ = CriticalSectionWrapper::CreateCriticalSection();
+    terminate_cond_ = ConditionVariableWrapper::CreateConditionVariable();
+    sleep_event = EventWrapper::Create();
+    return (cpu_polling_thread != NULL) && (init_crit_ != NULL) &&
+           (init_cond_ != NULL) && (terminate_crit_ != NULL) &&
+           (terminate_cond_ != NULL) && (sleep_event != NULL);
+}
+
+void CpuWindows::DeAllocateComplexDataTypes()
+{
+    if (sleep_event != NULL)
+    {
+        delete sleep_event;
+        sleep_event = NULL;
+    }
+    if (terminate_cond_ != NULL)
+    {
+        delete terminate_cond_;
+        terminate_cond_ = NULL;
+    }
+    if (terminate_crit_ != NULL)
+    {
+        delete terminate_crit_;
+        terminate_crit_ = NULL;
+    }
+    if (init_cond_ != NULL)
+    {
+        delete init_cond_;
+        init_cond_ = NULL;
+    }
+    if (init_crit_ != NULL)
+    {
+        delete init_crit_;
+        init_crit_ = NULL;
+    }
+    if (cpu_polling_thread != NULL)
+    {
+        delete cpu_polling_thread;
+        cpu_polling_thread = NULL;
+    }
+}
+
+bool CpuWindows::StartPollingCpu()
+{
+    unsigned int dummy_id = 0;
+    if (!cpu_polling_thread->Start(dummy_id))
+    {
+        return false;
+    }
+    {
+        CriticalSectionScoped cs(*init_crit_);
+        while(initialize_)
+        {
+            init_cond_->SleepCS(*init_crit_);
+        }
+    }
+    if (!initialized_)
+    {
+        cpu_polling_thread->Stop();
+        return false;
+    }
+    return initialized_;
+}
+
+bool CpuWindows::StopPollingCpu()
+{
+    if (!initialized_)
+    {
+        return false;
+    }
+    CriticalSectionScoped cs(*terminate_crit_);
+    terminate_ = true;
+    sleep_event->Set();
+    while (!terminated_)
+    {
+        terminate_cond_->SleepCS(*terminate_crit_);
+    }
+    cpu_polling_thread->Stop();
+    delete cpu_polling_thread;
+    cpu_polling_thread = NULL;
+    return true;
+}
+
+bool CpuWindows::Process(void* thread_object)
+{
+    return reinterpret_cast<CpuWindows*>(thread_object)->ProcessImpl();
+}
+
+bool CpuWindows::ProcessImpl()
+{
+    {
+        CriticalSectionScoped cs(*terminate_crit_);
+        if (terminate_)
+        {
+            const bool success = Terminate();
+            assert(success);
+            terminated_ = true;
+            terminate_cond_->WakeAll();
+            return false;
+        }
+    }
+    // Initialize on first iteration
+    if (initialize_)
+    {
+        CriticalSectionScoped cs(*init_crit_);
+        initialize_ = false;
+        const bool success = Initialize();
+        init_cond_->WakeAll();
+        if (!success || !initialized_)
+        {
+            initialized_ = false;
+            terminate_ = true;
+            return false;
+        }
+    }
+    // Approximately one seconds sleep for each CPU measurement. Precision is
+    // not important. 1 second refresh rate is also used by Performance Monitor
+    // (perfmon).
+    if(kEventTimeout != sleep_event->Wait(1000))
+    {
+        // Terminating. No need to update CPU usage.
+        assert(terminate_);
+        return true;
+    }
+
+    // UpdateCpuUsage() returns false if a single (or more) CPU read(s) failed.
+    // Not a major problem if it happens but make sure it doesnt trigger in
+    // debug.
+    const bool success = UpdateCpuUsage();
+    assert(success);
+    return true;
+}
+
+bool CpuWindows::CreateWmiConnection()
+{
+    IWbemLocator* service_locator = NULL;
+    HRESULT hr = CoCreateInstance(CLSID_WbemLocator, NULL,
+                                  CLSCTX_INPROC_SERVER, IID_IWbemLocator,
+                                  reinterpret_cast<void**> (&service_locator));
+    if (FAILED(hr))
+    {
+        return false;
+    }
+    // To get the WMI service specify the WMI namespace.
+    BSTR wmi_namespace = SysAllocString(L"\\\\.\\root\\cimv2");
+    if (wmi_namespace == NULL)
+    {
+        // This type of failure signifies running out of memory.
+        service_locator->Release();
+        return false;
+    }
+    hr = service_locator->ConnectServer(wmi_namespace, NULL, NULL, NULL, 0L,
+                                        NULL, NULL, &wbem_service_);
+    SysFreeString(wmi_namespace);
+    service_locator->Release();
+    return !FAILED(hr);
+}
+
+// Sets up WMI refresher and enum
+bool CpuWindows::CreatePerfOsRefresher()
+{
+    // Create refresher.
+    HRESULT hr = CoCreateInstance(CLSID_WbemRefresher, NULL,
+                                  CLSCTX_INPROC_SERVER, IID_IWbemRefresher,
+                                  reinterpret_cast<void**> (&wbem_refresher_));
+    if (FAILED(hr))
+    {
+        return false;
+    }
+    // Create PerfOS_Processor enum.
+    IWbemConfigureRefresher* wbem_refresher_config = NULL;
+    hr = wbem_refresher_->QueryInterface(
+        IID_IWbemConfigureRefresher,
+        reinterpret_cast<void**> (&wbem_refresher_config));
+    if (FAILED(hr))
+    {
+        return false;
+    }
+    // Don't care about the particular id for the enum.
+    long enum_id = 0;
+    hr = wbem_refresher_config->AddEnum(wbem_service_,
+                                        L"Win32_PerfRawData_PerfOS_Processor",
+                                        0, NULL, &wbem_enum_, &enum_id);
+    wbem_refresher_config->Release();
+    wbem_refresher_config = NULL;
+    return !FAILED(hr);
+}
+
+// Have to pull the first round of data to be able set the handles.
+bool CpuWindows::CreatePerfOsCpuHandles()
+{
+    // Update the refresher so that there is data available in wbem_enum_.
+    wbem_refresher_->Refresh(0L);
+
+    // The number of enumerators is the number of processor + 1 (the total).
+    // This is unknown at this point.
+    DWORD number_returned = 0;
+    HRESULT hr = wbem_enum_->GetObjects(0L, number_of_objects_,
+                                        wbem_enum_access_, &number_returned);
+    // number_returned indicates the number of enumerators that are needed.
+    if (hr == WBEM_E_BUFFER_TOO_SMALL &&
+        number_returned > number_of_objects_)
+    {
+        // Allocate the number IWbemObjectAccess asked for by the
+        // GetObjects(..) function.
+        wbem_enum_access_ = new IWbemObjectAccess*[number_returned];
+        cpu_usage_ = new WebRtc_UWord32[number_returned];
+        previous_processor_timestamp_ = new unsigned __int64[number_returned];
+        previous_100ns_timestamp_ = new unsigned __int64[number_returned];
+        if ((wbem_enum_access_ == NULL) || (cpu_usage_ == NULL) ||
+            (previous_processor_timestamp_ == NULL) ||
+            (previous_100ns_timestamp_ == NULL))
+        {
+            // Out of memory.
+            return false;
+        }
+
+        SecureZeroMemory(wbem_enum_access_, number_returned *
+                         sizeof(IWbemObjectAccess*));
+        memset(cpu_usage_, 0, sizeof(int) * number_returned);
+        memset(previous_processor_timestamp_, 0, sizeof(unsigned __int64) *
+               number_returned);
+        memset(previous_100ns_timestamp_, 0, sizeof(unsigned __int64) *
+               number_returned);
+
+        number_of_objects_ = number_returned;
+        // Read should be successfull now that memory has been allocated.
+        hr = wbem_enum_->GetObjects(0L, number_of_objects_, wbem_enum_access_,
+                                    &number_returned);
+        if (FAILED(hr))
+        {
+            return false;
+        }
+    }
+    else
+    {
+        // 0 enumerators should not be enough. Something has gone wrong here.
+        return false;
+    }
+
+    // Get the enumerator handles that are needed for calculating CPU usage.
+    CIMTYPE cpu_usage_type;
+    hr = wbem_enum_access_[0]->GetPropertyHandle(L"PercentProcessorTime",
+                                                 &cpu_usage_type,
+                                                 &cpu_usage_handle_);
+    if (FAILED(hr))
+    {
+        return false;
+    }
+    CIMTYPE timestamp_sys_100_ns_type;
+    hr = wbem_enum_access_[0]->GetPropertyHandle(L"TimeStamp_Sys100NS",
+                                                 &timestamp_sys_100_ns_type,
+                                                 &timestamp_sys_100_ns_handle_);
+    return !FAILED(hr);
+}
+
+bool CpuWindows::Initialize()
+{
+    if (terminate_)
+    {
+        return false;
+    }
+    // Initialize COM library.
+    HRESULT hr = CoInitializeEx(NULL,COINIT_MULTITHREADED);
+    if (FAILED(hr))
+    {
+        return false;
+    }
+    hr = CoInitializeSecurity(NULL, -1, NULL, NULL, RPC_C_AUTHN_LEVEL_NONE,
+                              RPC_C_IMP_LEVEL_IMPERSONATE, NULL, EOAC_NONE, 0);
+    if (FAILED(hr))
+    {
+        return false;
+    }
+
+    if (!CreateWmiConnection())
+    {
+        return false;
+    }
+    if (!CreatePerfOsRefresher())
+    {
+        return false;
+    }
+    if (!CreatePerfOsCpuHandles())
+    {
+        return false;
+    }
+    initialized_ = true;
+    return true;
+}
+
+bool CpuWindows::Terminate()
+{
+    // Reverse order of Initialize().
+    // Some compilers complain about deleting NULL though it's well defined
+    if (previous_100ns_timestamp_ != NULL)
+    {
+        delete[] previous_100ns_timestamp_;
+        previous_100ns_timestamp_ = NULL;
+    }
+    if (previous_processor_timestamp_ != NULL)
+    {
+        delete[] previous_processor_timestamp_;
+        previous_processor_timestamp_ = NULL;
+    }
+    if (cpu_usage_ != NULL)
+    {
+        delete[] cpu_usage_;
+        cpu_usage_ = NULL;
+    }
+    if (wbem_enum_access_ != NULL)
+    {
+        for (DWORD i = 0; i < number_of_objects_; i++)
+        {
+            if(wbem_enum_access_[i] != NULL)
+            {
+                wbem_enum_access_[i]->Release();
+            }
+        }
+        delete[] wbem_enum_access_;
+        wbem_enum_access_ = NULL;
+    }
+    if (wbem_enum_ != NULL)
+    {
+        wbem_enum_->Release();
+        wbem_enum_ = NULL;
+    }
+    if (wbem_refresher_ != NULL)
+    {
+        wbem_refresher_->Release();
+        wbem_refresher_ = NULL;
+    }
+    if (wbem_service_ != NULL)
+    {
+        wbem_service_->Release();
+        wbem_service_ = NULL;
+    }
+    // CoUninitialized should be called once for every CoInitializeEx.
+    // Regardless if it failed or not.
+    CoUninitialize();
+    return false;
+}
+
+bool CpuWindows::UpdateCpuUsage()
+{
+    wbem_refresher_->Refresh(0L);
+    DWORD number_returned = 0;
+    HRESULT hr = wbem_enum_->GetObjects(0L, number_of_objects_,
+                                        wbem_enum_access_,&number_returned);
+    if (FAILED(hr))
+    {
+        // wbem_enum_access_ has already been allocated. Unless the number of
+        // CPUs change runtime this should not happen.
+        return false;
+    }
+    unsigned __int64 cpu_usage = 0;
+    unsigned __int64 timestamp_100ns = 0;
+    bool returnValue = true;
+    for (DWORD i = 0; i < number_returned; i++)
+    {
+        hr = wbem_enum_access_[i]->ReadQWORD(cpu_usage_handle_,&cpu_usage);
+        if (FAILED(hr))
+        {
+            returnValue = false;
+        }
+        hr = wbem_enum_access_[i]->ReadQWORD(timestamp_sys_100_ns_handle_,
+                                             &timestamp_100ns);
+        if (FAILED(hr))
+        {
+            returnValue = false;
+        }
+        wbem_enum_access_[i]->Release();
+        wbem_enum_access_[i] = NULL;
+
+        const bool wrapparound =
+            (previous_processor_timestamp_[i] > cpu_usage) ||
+            (previous_100ns_timestamp_[i] > timestamp_100ns);
+        const bool first_time = (previous_processor_timestamp_[i] == 0) ||
+                                (previous_100ns_timestamp_[i] == 0);
+        if (wrapparound || first_time)
+        {
+            previous_processor_timestamp_[i] = cpu_usage;
+            previous_100ns_timestamp_[i] = timestamp_100ns;
+            continue;
+        }
+        const unsigned __int64 processor_timestamp_delta =
+            cpu_usage - previous_processor_timestamp_[i];
+        const unsigned __int64 timestamp_100ns_delta =
+            timestamp_100ns - previous_100ns_timestamp_[i];
+
+        if (processor_timestamp_delta >= timestamp_100ns_delta)
+        {
+            cpu_usage_[i] = 0;
+        } else {
+            // Quotient must be float since the division is guaranteed to yield
+            // a value between 0 and 1 which is 0 in integer division.
+            const float delta_quotient =
+                static_cast<float>(processor_timestamp_delta) /
+                static_cast<float>(timestamp_100ns_delta);
+            cpu_usage_[i] = 100 - static_cast<WebRtc_UWord32>(delta_quotient *
+                                                              100);
+        }
+        previous_processor_timestamp_[i] = cpu_usage;
+        previous_100ns_timestamp_[i] = timestamp_100ns;
+    }
+    return returnValue;
+}
+} // namespace webrtc

system_wrappers/source/cpu_windows.h

@@ -0,0 +1,102 @@
+// This file contains a Windows implementation of CpuWrapper.
+// Note: Windows XP, Windows Server 2003 are the minimum requirements.
+//       The requirements are due to the implementation being based on
+//       WMI.
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_SYSTEM_WRAPPERS_SOURCE_CPU_WINDOWS_NO_CPOL_H_
+#define WEBRTC_SYSTEM_WRAPPERS_SOURCE_CPU_WINDOWS_NO_CPOL_H_
+
+#include "cpu_wrapper.h"
+
+#include <Wbemidl.h>
+
+namespace webrtc {
+class ConditionVariableWrapper;
+class CriticalSectionWrapper;
+class EventWrapper;
+class ThreadWrapper;
+
+class CpuWindows : public CpuWrapper
+{
+public:
+    virtual WebRtc_Word32 CpuUsage();
+    virtual WebRtc_Word32 CpuUsage(WebRtc_Word8* /*pProcessName*/,
+                                   WebRtc_UWord32 /*length*/) {return -1;}
+    virtual WebRtc_Word32 CpuUsage(WebRtc_UWord32  /*dwProcessID*/) {return -1;}
+
+    virtual WebRtc_Word32 CpuUsageMultiCore(WebRtc_UWord32& num_cores,
+                                            WebRtc_UWord32*& cpu_usage);
+
+    virtual void Reset() {}
+    virtual void Stop() {}
+
+    CpuWindows();
+    virtual ~CpuWindows();
+private:
+    bool AllocateComplexDataTypes();
+    void DeAllocateComplexDataTypes();
+
+    bool StartPollingCpu();
+    bool StopPollingCpu();
+
+    static bool Process(void* thread_object);
+    bool ProcessImpl();
+
+    bool CreateWmiConnection();
+    bool CreatePerfOsRefresher();
+    bool CreatePerfOsCpuHandles();
+    bool Initialize();
+    bool Terminate();
+
+    bool UpdateCpuUsage();
+
+    ThreadWrapper* cpu_polling_thread;
+
+    bool initialize_;
+    bool initialized_;
+    CriticalSectionWrapper* init_crit_;
+    ConditionVariableWrapper* init_cond_;
+
+    bool terminate_;
+    bool terminated_;
+    CriticalSectionWrapper* terminate_crit_;
+    ConditionVariableWrapper* terminate_cond_;
+
+    // For sleep with wake-up functionality.
+    EventWrapper* sleep_event;
+
+    // Will be an array. Just care about CPU 0 for now.
+    WebRtc_UWord32* cpu_usage_;
+
+    // One IWbemObjectAccess for each processor and one for the total.
+    // 0-n-1 is the individual processors.
+    // n is the total.
+    IWbemObjectAccess** wbem_enum_access_;
+    DWORD number_of_objects_;
+
+    // Cpu timestamp
+    long cpu_usage_handle_;
+    unsigned __int64* previous_processor_timestamp_;
+
+    // Timestamp
+    long timestamp_sys_100_ns_handle_;
+    unsigned __int64* previous_100ns_timestamp_;
+
+    IWbemServices* wbem_service_;
+
+    IWbemRefresher* wbem_refresher_;
+
+    IWbemHiPerfEnum* wbem_enum_;
+
+};
+} // namespace webrtc
+#endif // WEBRTC_SYSTEM_WRAPPERS_SOURCE_CPU_WINDOWS_NO_CPOL_H_

system_wrappers/source/critical_section.cc

@@ -0,0 +1,27 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#if defined(_WIN32)
+    #include <windows.h>
+    #include "critical_section_windows.h"
+#else
+    #include "critical_section_linux.h"
+#endif
+
+namespace webrtc {
+CriticalSectionWrapper* CriticalSectionWrapper::CreateCriticalSection()
+{
+#ifdef _WIN32
+    return new CriticalSectionWindows();
+#else
+    return new CriticalSectionLinux();
+#endif
+}
+} // namespace webrtc

system_wrappers/source/critical_section_linux.cc

@@ -0,0 +1,38 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "critical_section_linux.h"
+
+namespace webrtc {
+CriticalSectionLinux::CriticalSectionLinux()
+{
+    pthread_mutexattr_t attr;
+    pthread_mutexattr_init(&attr);
+    pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
+    pthread_mutex_init(&_mutex, &attr);
+}
+
+CriticalSectionLinux::~CriticalSectionLinux()
+{
+    pthread_mutex_destroy(&_mutex);
+}
+
+void
+CriticalSectionLinux::Enter()
+{
+    pthread_mutex_lock(&_mutex);
+}
+
+void
+CriticalSectionLinux::Leave()
+{
+    pthread_mutex_unlock(&_mutex);
+}
+} // namespace webrtc

system_wrappers/source/critical_section_linux.h

@@ -0,0 +1,35 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_SYSTEM_WRAPPERS_SOURCE_CRITICAL_SECTION_LINUX_H_
+#define WEBRTC_SYSTEM_WRAPPERS_SOURCE_CRITICAL_SECTION_LINUX_H_
+
+#include "critical_section_wrapper.h"
+
+#include <pthread.h>
+
+namespace webrtc {
+class CriticalSectionLinux : public CriticalSectionWrapper
+{
+public:
+    CriticalSectionLinux();
+
+    virtual ~CriticalSectionLinux();
+
+    virtual void Enter();
+    virtual void Leave();
+
+private:
+    pthread_mutex_t _mutex;
+    friend class ConditionVariableLinux;
+};
+} // namespace webrtc
+
+#endif // WEBRTC_SYSTEM_WRAPPERS_SOURCE_CRITICAL_SECTION_LINUX_H_

system_wrappers/source/critical_section_windows.cc

@@ -0,0 +1,35 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "critical_section_windows.h"
+
+namespace webrtc {
+CriticalSectionWindows::CriticalSectionWindows()
+{
+    InitializeCriticalSection(&crit);
+}
+
+CriticalSectionWindows::~CriticalSectionWindows()
+{
+    DeleteCriticalSection(&crit);
+}
+
+void
+CriticalSectionWindows::Enter()
+{
+    EnterCriticalSection(&crit);
+}
+
+void
+CriticalSectionWindows::Leave()
+{
+    LeaveCriticalSection(&crit);
+}
+} // namespace webrtc

system_wrappers/source/critical_section_windows.h

@@ -0,0 +1,36 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_SYSTEM_WRAPPERS_SOURCE_CRITICAL_SECTION_WINDOWS_H_
+#define WEBRTC_SYSTEM_WRAPPERS_SOURCE_CRITICAL_SECTION_WINDOWS_H_
+
+#include "typedefs.h"
+#include "critical_section_wrapper.h"
+#include <windows.h>
+
+namespace webrtc {
+class CriticalSectionWindows : public CriticalSectionWrapper
+{
+public:
+    CriticalSectionWindows();
+
+    virtual ~CriticalSectionWindows();
+
+    virtual void Enter();
+    virtual void Leave();
+
+private:
+    CRITICAL_SECTION crit;
+
+    friend class ConditionVariableWindows;
+};
+} // namespace webrtc
+
+#endif // WEBRTC_SYSTEM_WRAPPERS_SOURCE_CRITICAL_SECTION_WINDOWS_H_

system_wrappers/source/event.cc

@@ -0,0 +1,52 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "event_wrapper.h"
+
+#if defined(_WIN32)
+    #include <windows.h>
+    #include "event_windows.h"
+#else
+    #include <pthread.h>
+    #include "event_linux.h"
+#endif
+
+namespace webrtc {
+EventWrapper* EventWrapper::Create()
+{
+#if defined(_WIN32)
+    return new EventWindows();
+#else
+    return EventLinux::Create();
+#endif
+}
+
+int EventWrapper::KeyPressed()
+{
+#if defined(_WIN32)
+    int keyDown = 0;
+    for(int key = 0x20; key < 0x90; key++)
+    {
+        short res = GetAsyncKeyState(key);
+        keyDown |= res%2;  // Get the LSB
+    }
+    if(keyDown)
+    {
+        return 1;
+    }
+    else
+    {
+        return 0;
+    }
+#else
+    return -1;
+#endif
+}
+} // namespace webrtc

system_wrappers/source/event_linux.cc

@@ -0,0 +1,324 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "event_linux.h"
+
+#include <errno.h>
+#include <pthread.h>
+#include <signal.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/time.h>
+#include <unistd.h>
+
+namespace webrtc {
+const long int E6 = 1000000;
+const long int E9 = 1000 * E6;
+
+EventWrapper* EventLinux::Create()
+{
+    EventLinux* ptr = new EventLinux;
+    if (!ptr)
+    {
+        return NULL;
+    }
+
+    const int error = ptr->Construct();
+    if (error)
+    {
+        delete ptr;
+        return NULL;
+    }
+    return ptr;
+}
+
+
+EventLinux::EventLinux()
+    : _timerThread(0),
+      _timerEvent(0),
+      _periodic(false),
+      _time(0),
+      _count(0),
+      _state(kDown)
+{
+}
+
+int EventLinux::Construct()
+{
+    // Set start time to zero
+    memset(&_tCreate, 0, sizeof(_tCreate));
+
+    int result = pthread_mutex_init(&mutex, 0);
+    if (result != 0)
+    {
+        return -1;
+    }
+#ifdef WEBRTC_CLOCK_TYPE_REALTIME
+    result = pthread_cond_init(&cond, 0);
+    if (result != 0)
+    {
+        return -1;
+    }
+#else
+    pthread_condattr_t condAttr;
+    result = pthread_condattr_init(&condAttr);
+    if (result != 0)
+    {
+        return -1;
+    }
+    result = pthread_condattr_setclock(&condAttr, CLOCK_MONOTONIC);
+    if (result != 0)
+    {
+        return -1;
+    }
+    result = pthread_cond_init(&cond, &condAttr);
+    if (result != 0)
+    {
+        return -1;
+    }
+    result = pthread_condattr_destroy(&condAttr);
+    if (result != 0)
+    {
+        return -1;
+    }
+#endif
+    return 0;
+}
+
+EventLinux::~EventLinux()
+{
+    StopTimer();
+    pthread_cond_destroy(&cond);
+    pthread_mutex_destroy(&mutex);
+}
+
+bool EventLinux::Reset()
+{
+    if (0 != pthread_mutex_lock(&mutex))
+    {
+        return false;
+    }
+    _state = kDown;
+    pthread_mutex_unlock(&mutex);
+    return true;
+}
+
+bool EventLinux::Set()
+{
+    if (0 != pthread_mutex_lock(&mutex))
+    {
+        return false;
+    }
+    _state = kUp;
+     // Release all waiting threads
+    pthread_cond_broadcast(&cond);
+    pthread_mutex_unlock(&mutex);
+    return true;
+}
+
+EventTypeWrapper EventLinux::Wait(unsigned long timeout)
+{
+    int retVal = 0;
+    if (0 != pthread_mutex_lock(&mutex))
+    {
+        return kEventError;
+    }
+
+    if (kDown == _state)
+    {
+        if (WEBRTC_EVENT_INFINITE != timeout)
+        {
+            timespec tEnd;
+#ifndef WEBRTC_MAC
+#ifdef WEBRTC_CLOCK_TYPE_REALTIME
+            clock_gettime(CLOCK_REALTIME, &tEnd);
+#else
+            clock_gettime(CLOCK_MONOTONIC, &tEnd);
+#endif
+#else
+            timeval tVal;
+            struct timezone tZone;
+            tZone.tz_minuteswest = 0;
+            tZone.tz_dsttime = 0;
+            gettimeofday(&tVal,&tZone);
+            TIMEVAL_TO_TIMESPEC(&tVal,&tEnd);
+#endif
+            tEnd.tv_sec  += timeout / 1000;
+            tEnd.tv_nsec += (timeout - (timeout / 1000) * 1000) * E6;
+
+            if (tEnd.tv_nsec >= E9)
+            {
+                tEnd.tv_sec++;
+                tEnd.tv_nsec -= E9;
+            }
+            retVal = pthread_cond_timedwait(&cond, &mutex, &tEnd);
+        } else {
+            retVal = pthread_cond_wait(&cond, &mutex);
+        }
+    }
+
+    _state = kDown;
+    pthread_mutex_unlock(&mutex);
+
+    switch(retVal)
+    {
+    case 0:
+        return kEventSignaled;
+    case ETIMEDOUT:
+        return kEventTimeout;
+    default:
+        return kEventError;
+    }
+}
+
+EventTypeWrapper EventLinux::Wait(timespec& tPulse)
+{
+    int retVal = 0;
+    if (0 != pthread_mutex_lock(&mutex))
+    {
+        return kEventError;
+    }
+
+    if (kUp != _state)
+    {
+        retVal = pthread_cond_timedwait(&cond, &mutex, &tPulse);
+    }
+    _state = kDown;
+
+    pthread_mutex_unlock(&mutex);
+
+    switch(retVal)
+    {
+    case 0:
+        return kEventSignaled;
+    case ETIMEDOUT:
+        return kEventTimeout;
+    default:
+        return kEventError;
+    }
+}
+
+bool EventLinux::StartTimer(bool periodic, unsigned long time)
+{
+    if (_timerThread)
+    {
+        if(_periodic)
+        {
+            // Timer already started.
+            return false;
+        } else  {
+            // New one shot timer
+            _time = time;
+            _tCreate.tv_sec = 0;
+            _timerEvent->Set();
+            return true;
+        }
+    }
+
+    // Start the timer thread
+    _timerEvent = static_cast<EventLinux*>(EventWrapper::Create());
+    const char* threadName = "WebRtc_event_timer_thread";
+    _timerThread = ThreadWrapper::CreateThread(Run, this, kRealtimePriority,
+                                               threadName);
+    _periodic = periodic;
+    _time = time;
+    unsigned int id = 0;
+    if (_timerThread->Start(id))
+    {
+        return true;
+    }
+    return false;
+}
+
+bool EventLinux::Run(ThreadObj obj)
+{
+    return static_cast<EventLinux*>(obj)->Process();
+}
+
+bool EventLinux::Process()
+{
+    if (_tCreate.tv_sec == 0)
+    {
+#ifndef WEBRTC_MAC
+#ifdef WEBRTC_CLOCK_TYPE_REALTIME
+        clock_gettime(CLOCK_REALTIME, &_tCreate);
+#else
+        clock_gettime(CLOCK_MONOTONIC, &_tCreate);
+#endif
+#else
+        timeval tVal;
+        struct timezone tZone;
+        tZone.tz_minuteswest = 0;
+        tZone.tz_dsttime = 0;
+        gettimeofday(&tVal,&tZone);
+        TIMEVAL_TO_TIMESPEC(&tVal,&_tCreate);
+#endif
+        _count=0;
+    }
+
+    timespec tEnd;
+    unsigned long long time = _time * ++_count;
+    tEnd.tv_sec  = _tCreate.tv_sec + time/1000;
+    tEnd.tv_nsec = _tCreate.tv_nsec + (time - (time/1000)*1000)*E6;
+
+    if ( tEnd.tv_nsec >= E9 )
+    {
+        tEnd.tv_sec++;
+        tEnd.tv_nsec -= E9;
+    }
+
+    switch(_timerEvent->Wait(tEnd))
+    {
+    case kEventSignaled:
+        return true;
+    case kEventError:
+        return false;
+    case kEventTimeout:
+        break;
+    }
+    if(_periodic || _count==1)
+    {
+        Set();
+    }
+    return true;
+}
+
+bool EventLinux::StopTimer()
+{
+    if(_timerThread)
+    {
+        _timerThread->SetNotAlive();
+    }
+    if (_timerEvent)
+    {
+        _timerEvent->Set();
+    }
+    if (_timerThread)
+    {
+        if(!_timerThread->Stop())
+        {
+            return false;
+        }
+
+        delete _timerThread;
+        _timerThread = 0;
+    }
+    if (_timerEvent)
+    {
+        delete _timerEvent;
+        _timerEvent = 0;
+    }
+
+    // Set time to zero to force new reference time for the timer.
+    memset(&_tCreate, 0, sizeof(_tCreate));
+    _count=0;
+    return true;
+}
+} // namespace webrtc

system_wrappers/source/event_linux.h

@@ -0,0 +1,66 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_SYSTEM_WRAPPERS_SOURCE_EVENT_LINUX_H_
+#define WEBRTC_SYSTEM_WRAPPERS_SOURCE_EVENT_LINUX_H_
+
+#include "event_wrapper.h"
+
+#include <pthread.h>
+#include <time.h>
+
+#include "thread_wrapper.h"
+
+namespace webrtc {
+enum State
+{
+    kUp = 1,
+    kDown = 2
+};
+
+class EventLinux : public EventWrapper
+{
+public:
+    static EventWrapper* Create();
+
+    virtual ~EventLinux();
+
+    virtual EventTypeWrapper Wait(unsigned long maxTime);
+    virtual bool Set();
+    virtual bool Reset();
+
+    virtual bool StartTimer(bool periodic, unsigned long time);
+    virtual bool StopTimer();
+
+private:
+    EventLinux();
+    int Construct();
+
+    static bool Run(ThreadObj obj);
+    bool Process();
+    EventTypeWrapper Wait(timespec& tPulse);
+
+
+private:
+    pthread_cond_t  cond;
+    pthread_mutex_t mutex;
+
+    ThreadWrapper* _timerThread;
+    EventLinux*    _timerEvent;
+    timespec       _tCreate;
+
+    bool          _periodic;
+    unsigned long _time;  // In ms
+    unsigned long _count;
+    State         _state;
+};
+} // namespace webrtc
+
+#endif // WEBRTC_SYSTEM_WRAPPERS_SOURCE_EVENT_LINUX_H_

system_wrappers/source/event_windows.cc

@@ -0,0 +1,84 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "event_windows.h"
+
+#include "Mmsystem.h"
+
+namespace webrtc {
+EventWindows::EventWindows()
+    : _event(::CreateEvent(NULL  /* security attributes */,
+                           FALSE /* manual reset */,
+                           FALSE /* initial state */,
+                           NULL  /* name of event */)),
+      _timerID(NULL)
+{
+}
+
+EventWindows::~EventWindows()
+{
+    CloseHandle(_event);
+}
+
+bool EventWindows::Set()
+{
+    // Note: setting an event that is already set has no effect.
+    return SetEvent(_event);
+}
+
+bool EventWindows::Reset()
+{
+    return ResetEvent(_event);
+}
+
+EventTypeWrapper EventWindows::Wait(unsigned long maxTime)
+{
+    unsigned long res = WaitForSingleObject(_event, maxTime);
+    switch(res)
+    {
+    case WAIT_OBJECT_0:
+        return kEventSignaled;
+    case WAIT_TIMEOUT:
+        return kEventTimeout;
+    default:
+        return kEventError;
+    }
+}
+
+bool EventWindows::StartTimer(bool periodic, unsigned long time)
+{
+    if (_timerID != NULL)
+    {
+        timeKillEvent(_timerID);
+        _timerID=NULL;
+    }
+    if (periodic)
+    {
+        _timerID=timeSetEvent(time, 0,(LPTIMECALLBACK)HANDLE(_event),0,
+                              TIME_PERIODIC|TIME_CALLBACK_EVENT_PULSE);
+    } else {
+        _timerID=timeSetEvent(time, 0,(LPTIMECALLBACK)HANDLE(_event),0,
+                              TIME_ONESHOT|TIME_CALLBACK_EVENT_SET);
+    }
+
+    if (_timerID == NULL)
+    {
+        return false;
+    }
+    return true;
+}
+
+bool EventWindows::StopTimer()
+{
+    timeKillEvent(_timerID);
+    _timerID = NULL;
+    return true;
+}
+} // namespace webrtc

system_wrappers/source/event_windows.h

@@ -0,0 +1,40 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_SYSTEM_WRAPPERS_SOURCE_EVENT_WINDOWS_H_
+#define WEBRTC_SYSTEM_WRAPPERS_SOURCE_EVENT_WINDOWS_H_
+
+#include <windows.h>
+
+#include "event_wrapper.h"
+
+#include "typedefs.h"
+
+namespace webrtc {
+class EventWindows : public EventWrapper
+{
+public:
+    EventWindows();
+    virtual ~EventWindows();
+
+    virtual EventTypeWrapper Wait(unsigned long maxTime);
+    virtual bool Set();
+    virtual bool Reset();
+
+    virtual bool StartTimer(bool periodic, unsigned long time);
+    virtual bool StopTimer();
+
+private:
+    HANDLE  _event;
+    WebRtc_UWord32 _timerID;
+};
+} // namespace webrtc
+
+#endif // WEBRTC_SYSTEM_WRAPPERS_SOURCE_EVENT_WINDOWS_H_

system_wrappers/source/file_impl.cc

@@ -0,0 +1,267 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "file_impl.h"
+
+#include <cassert>
+
+#ifdef _WIN32
+    #include <Windows.h>
+#else
+    #include <stdarg.h>
+    #include <string.h>
+#endif
+
+namespace webrtc {
+FileWrapper* FileWrapper::Create()
+{
+    return new FileWrapperImpl();
+}
+
+FileWrapperImpl::FileWrapperImpl()
+    : _id(NULL),
+      _open(false),
+      _looping(false),
+      _readOnly(false),
+      _text(false),
+      _maxSizeInBytes(-1),
+      _sizeInBytes(0)
+{
+    memset(_fileNameUTF8, 0, kMaxFileNameSize);
+}
+
+FileWrapperImpl::~FileWrapperImpl()
+{
+    if (_id != NULL)
+    {
+        fclose(_id);
+    }
+}
+
+WebRtc_Word32 FileWrapperImpl::CloseFile()
+{
+    if (_id != NULL)
+    {
+        fclose(_id);
+        _id = NULL;
+    }
+    memset(_fileNameUTF8, 0, kMaxFileNameSize);
+    _open = false;
+    return 0;
+}
+
+int FileWrapperImpl::Rewind()
+{
+    if(_looping || !_readOnly)
+    {
+        if (_id != NULL)
+        {
+            _sizeInBytes = 0;
+            return fseek(_id, 0, SEEK_SET);
+        }
+    }
+    return -1;
+}
+
+WebRtc_Word32 FileWrapperImpl::SetMaxFileSize(WebRtc_Word32 bytes)
+{
+    _maxSizeInBytes = bytes;
+    return 0;
+}
+
+WebRtc_Word32 FileWrapperImpl::Flush()
+{
+    if (_id != NULL)
+    {
+        return fflush(_id);
+    }
+    return -1;
+}
+
+WebRtc_Word32 FileWrapperImpl::FileName(WebRtc_Word8* fileNameUTF8,
+                                        WebRtc_UWord32 size) const
+{
+    WebRtc_Word32 len = static_cast<WebRtc_Word32>(strlen(_fileNameUTF8));
+    if(len > kMaxFileNameSize)
+    {
+        assert(false);
+        return -1;
+    }
+    if(len < 1)
+    {
+        return -1;
+    }
+    // Make sure to NULL terminate
+    if(size < (WebRtc_UWord32)len)
+    {
+        len = size - 1;
+    }
+    memcpy(fileNameUTF8, _fileNameUTF8, len);
+    fileNameUTF8[len] = 0;
+    return 0;
+}
+
+bool
+FileWrapperImpl::Open() const
+{
+    return _open;
+}
+
+WebRtc_Word32 FileWrapperImpl::OpenFile(const WebRtc_Word8 *fileNameUTF8,
+                                        const bool readOnly, const bool loop,
+                                        const bool text)
+{
+    WebRtc_Word32 length = (WebRtc_Word32)strlen(fileNameUTF8);
+    if (length > kMaxFileNameSize)
+    {
+        return -1;
+    }
+
+    _readOnly = readOnly;
+
+    FILE *tmpId = NULL;
+#if defined _WIN32
+    wchar_t wideFileName[kMaxFileNameSize];
+    wideFileName[0] = 0;
+
+    MultiByteToWideChar(CP_UTF8,
+                        0 /*UTF8 flag*/,
+                        fileNameUTF8,
+                        -1 /*Null terminated string*/,
+                        wideFileName,
+                        kMaxFileNameSize);
+    if(text)
+    {
+        if(readOnly)
+        {
+            tmpId = _wfopen(wideFileName, L"rt");
+        } else {
+            tmpId = _wfopen(wideFileName, L"wt");
+        }
+    } else {
+        if(readOnly)
+        {
+            tmpId = _wfopen(wideFileName, L"rb");
+        } else {
+            tmpId = _wfopen(wideFileName, L"wb");
+        }
+    }
+#else
+    if(text)
+    {
+        if(readOnly)
+        {
+            tmpId = fopen(fileNameUTF8, "rt");
+        } else {
+            tmpId = fopen(fileNameUTF8, "wt");
+        }
+    } else {
+        if(readOnly)
+        {
+            tmpId = fopen(fileNameUTF8, "rb");
+        } else {
+            tmpId = fopen(fileNameUTF8, "wb");
+        }
+    }
+#endif
+
+    if (tmpId != NULL)
+    {
+        // + 1 comes fro copying the NULL termination charachter too
+        memcpy(_fileNameUTF8, fileNameUTF8, length + 1);
+        if (_id != NULL)
+        {
+            fclose(_id);
+        }
+        _id = tmpId;
+        _looping = loop;
+        _open = true;
+        return 0;
+    }
+    return -1;
+}
+
+int FileWrapperImpl::Read(void *buf, int len)
+{
+    if(len < 0)
+    {
+        return 0;
+    }
+    if (_id != NULL)
+    {
+        WebRtc_Word32 res = static_cast<WebRtc_Word32>(fread(buf, 1, len, _id));
+        if (res != len)
+        {
+            if(!_looping)
+            {
+                CloseFile();
+            }
+        }
+        return res;
+    }
+    return -1;
+}
+
+WebRtc_Word32 FileWrapperImpl::WriteText(const WebRtc_Word8* text, ...)
+{
+    assert(!_readOnly);
+    assert(!_text);
+
+    if (_id == NULL)
+    {
+        return -1;
+    }
+
+    char tempBuff[kFileMaxTextMessageSize];
+    if (text)
+    {
+        va_list args;
+        va_start(args, text);
+#ifdef _WIN32
+        _vsnprintf(tempBuff, kFileMaxTextMessageSize-1, text, args);
+#else
+        vsnprintf(tempBuff, kFileMaxTextMessageSize-1, text, args);
+#endif
+        va_end(args);
+        WebRtc_Word32 nBytes;
+        nBytes = fprintf(_id, "%s", tempBuff);
+        if (nBytes > 0)
+        {
+            return 0;
+        }
+        CloseFile();
+    }
+    return -1;
+}
+
+bool FileWrapperImpl::Write(const void* buf, int len)
+{
+    assert(!_readOnly);
+    if (_id != NULL)
+    {
+        // Check if it's time to stop writing.
+        if ((_maxSizeInBytes != -1) &&
+             _sizeInBytes + len > (WebRtc_UWord32)_maxSizeInBytes)
+        {
+            Flush();
+            return false;
+        }
+
+        size_t nBytes = fwrite((WebRtc_UWord8*)buf, 1, len, _id);
+        if (nBytes > 0)
+        {
+            _sizeInBytes += static_cast<WebRtc_Word32>(nBytes);
+            return true;
+        }
+        CloseFile();
+    }
+    return false;
+}
+} // namespace webrtc

system_wrappers/source/file_impl.h

@@ -0,0 +1,57 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_SYSTEM_WRAPPERS_SOURCE_FILE_IMPL_H_
+#define WEBRTC_SYSTEM_WRAPPERS_SOURCE_FILE_IMPL_H_
+
+#include "file_wrapper.h"
+
+#include <stdio.h>
+
+namespace webrtc {
+class FileWrapperImpl : public FileWrapper
+{
+public:
+    FileWrapperImpl();
+    virtual ~FileWrapperImpl();
+
+    virtual WebRtc_Word32 FileName(WebRtc_Word8* fileNameUTF8,
+                                   WebRtc_UWord32 size) const;
+
+    virtual bool Open() const;
+
+    virtual WebRtc_Word32 OpenFile(const WebRtc_Word8* fileNameUTF8,
+                                 const bool readOnly,
+                                 const bool loop = false,
+                                 const bool text = false);
+
+    virtual WebRtc_Word32 CloseFile();
+    virtual WebRtc_Word32 SetMaxFileSize(WebRtc_Word32 bytes);
+    virtual WebRtc_Word32 Flush();
+
+    virtual int Read(void* buf, int len);
+    virtual bool Write(const void *buf, int len);
+    virtual int Rewind();
+
+    virtual WebRtc_Word32 WriteText(const WebRtc_Word8* text, ...);
+
+private:
+    FILE*          _id;
+    bool           _open;
+    bool           _looping;
+    bool           _readOnly;
+    bool           _text;
+    WebRtc_Word32  _maxSizeInBytes; // -1 indicates file size limitation is off
+    WebRtc_UWord32 _sizeInBytes;
+    WebRtc_Word8   _fileNameUTF8[kMaxFileNameSize];
+};
+} // namespace webrtc
+
+#endif // WEBRTC_SYSTEM_WRAPPERS_SOURCE_FILE_IMPL_H_

system_wrappers/source/list_no_stl.cc

@@ -0,0 +1,289 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "list_wrapper.h"
+
+#include "critical_section_wrapper.h"
+#include "trace.h"
+
+namespace webrtc {
+ListItem::ListItem(const void* item)
+    : next_(0),
+      prev_(0),
+      item_ptr_(item),
+      item_(0)
+{
+}
+
+ListItem::ListItem(const unsigned int item)
+    : next_(0),
+      prev_(0),
+      item_ptr_(0),
+      item_(item)
+{
+}
+
+ListItem::~ListItem()
+{
+}
+
+void* ListItem::GetItem() const
+{
+    return const_cast<void*>(item_ptr_);
+}
+
+unsigned int ListItem::GetUnsignedItem() const
+{
+    return item_;
+}
+
+ListWrapper::ListWrapper()
+    : critical_section_(CriticalSectionWrapper::CreateCriticalSection()),
+      first_(0),
+      last_(0),
+      size_(0)
+{
+}
+
+ListWrapper::~ListWrapper()
+{
+    if (!Empty())
+    {
+        // TODO (hellner) I'm not sure this loggin is useful.
+        WEBRTC_TRACE(kTraceMemory, kTraceUtility, -1,
+                   "Potential memory leak in ListWrapper");
+        // Remove all remaining list items.
+        while (Erase(First()) == 0)
+        {}
+    }
+    delete critical_section_;
+}
+
+bool ListWrapper::Empty() const
+{
+    return !first_ && !last_;
+}
+
+unsigned int ListWrapper::GetSize() const
+{
+    return size_;
+}
+
+int ListWrapper::PushBack(const void* ptr)
+{
+    ListItem* item = new ListItem(ptr);
+    CriticalSectionScoped lock(*critical_section_);
+    PushBackImpl(item);
+    return 0;
+}
+
+int ListWrapper::PushBack(const unsigned int item_id)
+{
+    ListItem* item = new ListItem(item_id);
+    CriticalSectionScoped lock(*critical_section_);
+    PushBackImpl(item);
+    return 0;
+}
+
+int ListWrapper::PushFront(const unsigned int item_id)
+{
+    ListItem* item = new ListItem(item_id);
+    CriticalSectionScoped lock(*critical_section_);
+    PushFrontImpl(item);
+    return 0;
+}
+
+int ListWrapper::PushFront(const void* ptr)
+{
+    ListItem* item = new ListItem(ptr);
+    CriticalSectionScoped lock(*critical_section_);
+    PushFrontImpl(item);
+    return 0;
+}
+
+int ListWrapper::PopFront()
+{
+    return Erase(first_);
+}
+
+int ListWrapper::PopBack()
+{
+    return Erase(last_);
+}
+
+ListItem* ListWrapper::First() const
+{
+    return first_;
+}
+
+ListItem* ListWrapper::Last() const
+{
+    return last_;
+}
+
+ListItem* ListWrapper::Next(ListItem* item) const
+{
+    if(!item)
+    {
+        return 0;
+    }
+    return item->next_;
+}
+
+ListItem* ListWrapper::Previous(ListItem* item) const
+{
+    if (!item)
+    {
+        return 0;
+    }
+    return item->prev_;
+}
+
+int ListWrapper::Insert(ListItem* existing_previous_item, ListItem* new_item)
+{
+    if (!new_item)
+    {
+        return -1;
+    }
+    // Allow existing_previous_item to be NULL if the list is empty.
+    // TODO (hellner) why allow this? Keep it as is for now to avoid
+    // breaking API contract.
+    if (!existing_previous_item && !Empty())
+    {
+        return -1;
+    }
+    CriticalSectionScoped lock(*critical_section_);
+    if (!existing_previous_item)
+    {
+        PushBackImpl(new_item);
+        return 0;
+    }
+    ListItem* next_item = existing_previous_item->next_;
+    new_item->next_ = existing_previous_item->next_;
+    new_item->prev_ = existing_previous_item;
+    existing_previous_item->next_ = new_item;
+    if (next_item)
+    {
+        next_item->prev_ = new_item;
+    }
+    else
+    {
+        last_ = new_item;
+    }
+    size_++;
+    return 0;
+}
+
+int ListWrapper::InsertBefore(ListItem* existing_next_item,
+                              ListItem* new_item)
+{
+    if (!new_item)
+    {
+        return -1;
+    }
+    // Allow existing_next_item to be NULL if the list is empty.
+    // Todo: why allow this? Keep it as is for now to avoid breaking API
+    // contract.
+    if (!existing_next_item && !Empty())
+    {
+        return -1;
+    }
+    CriticalSectionScoped lock(*critical_section_);
+    if (!existing_next_item)
+    {
+        PushBackImpl(new_item);
+        return 0;
+    }
+
+    ListItem* previous_item = existing_next_item->prev_;
+    new_item->next_ = existing_next_item;
+    new_item->prev_ = previous_item;
+    existing_next_item->prev_ = new_item;
+    if (previous_item)
+    {
+        previous_item->next_ = new_item;
+    }
+    else
+    {
+        first_ = new_item;
+    }
+    size_++;
+    return 0;
+}
+
+int ListWrapper::Erase(ListItem* item)
+{
+    if (!item)
+    {
+        return -1;
+    }
+    size_--;
+    ListItem* previous_item = item->prev_;
+    ListItem* next_item = item->next_;
+    if (!previous_item)
+    {
+        if(next_item)
+        {
+            next_item->prev_ = 0;
+        }
+        first_ = next_item;
+    }
+    else
+    {
+        previous_item->next_ = next_item;
+    }
+    if (!next_item)
+    {
+        if(previous_item)
+        {
+            previous_item->next_ = 0;
+        }
+        last_ = previous_item;
+    }
+    else
+    {
+        next_item->prev_ = previous_item;
+    }
+    delete item;
+    return 0;
+}
+
+void ListWrapper::PushBackImpl(ListItem* item)
+{
+    if (Empty())
+    {
+        first_ = item;
+        last_ = item;
+        size_++;
+        return;
+    }
+
+    item->prev_ = last_;
+    last_->next_ = item;
+    last_ = item;
+    size_++;
+}
+
+void ListWrapper::PushFrontImpl(ListItem* item)
+{
+    if (Empty())
+    {
+        first_ = item;
+        last_ = item;
+        size_++;
+        return;
+    }
+
+    item->next_ = first_;
+    first_->prev_ = item;
+    first_ = item;
+    size_++;
+}
+} //namespace webrtc

system_wrappers/source/list_no_stl.h

@@ -0,0 +1,79 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_SYSTEM_WRAPPERS_SOURCE_LIST_NO_STL_H_
+#define WEBRTC_SYSTEM_WRAPPERS_SOURCE_LIST_NO_STL_H_
+
+#include "constructor_magic.h"
+
+namespace webrtc {
+class CriticalSectionWrapper;
+
+class ListNoStlItem
+{
+public:
+    ListNoStlItem(const void* ptr);
+    ListNoStlItem(const unsigned int item);
+    virtual ~ListNoStlItem();
+    void* GetItem() const;
+    unsigned int GetUnsignedItem() const;
+
+protected:
+    ListNoStlItem* next_;
+    ListNoStlItem* prev_;
+
+private:
+    friend class ListNoStl;
+
+    const void*         item_ptr_;
+    const unsigned int  item_;
+    DISALLOW_COPY_AND_ASSIGN(ListNoStlItem);
+};
+
+
+class ListNoStl
+{
+public:
+    ListNoStl();
+    virtual ~ListNoStl();
+
+    // ListWrapper functions
+    unsigned int GetSize() const;
+    int PushBack(const void* ptr);
+    int PushBack(const unsigned int item_id);
+    int PushFront(const void* ptr);
+    int PushFront(const unsigned int item_id);
+    int PopFront();
+    int PopBack();
+    bool Empty() const;
+    ListNoStlItem* First() const;
+    ListNoStlItem* Last() const;
+    ListNoStlItem* Next(ListNoStlItem* item) const;
+    ListNoStlItem* Previous(ListNoStlItem* item) const;
+    int Erase(ListNoStlItem* item);
+    int Insert(ListNoStlItem* existing_previous_item,
+               ListNoStlItem* new_item);
+
+    int InsertBefore(ListNoStlItem* existing_next_item,
+                     ListNoStlItem* new_item);
+
+private:
+    void PushBack(ListNoStlItem* item);
+    void PushFront(ListNoStlItem* item);
+
+    CriticalSectionWrapper* critical_section_;
+    ListNoStlItem* first_;
+    ListNoStlItem* last_;
+    unsigned int size_;
+    DISALLOW_COPY_AND_ASSIGN(ListNoStl);
+};
+} // namespace webrtc
+
+#endif // WEBRTC_SYSTEM_WRAPPERS_SOURCE_LIST_NO_STL_H_

system_wrappers/source/list_stl.cc

@@ -0,0 +1,244 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "list_wrapper.h"
+
+#include "trace.h"
+
+namespace webrtc {
+ListItem::ListItem(const void* item)
+    : this_iter_(),
+      item_ptr_(item),
+      item_(0)
+{
+}
+
+ListItem::ListItem(const unsigned int item)
+    : this_iter_(),
+      item_ptr_(0),
+      item_(item)
+{
+}
+
+ListItem::~ListItem()
+{
+}
+
+void* ListItem::GetItem() const
+{
+    return const_cast<void*>(item_ptr_);
+}
+
+unsigned int ListItem::GetUnsignedItem() const
+{
+    return item_;
+}
+
+ListWrapper::ListWrapper() : list_()
+{
+}
+
+ListWrapper::~ListWrapper()
+{
+    if (!Empty())
+    {
+        // TODO (hellner) I'm not sure this loggin is useful.
+        WEBRTC_TRACE(kTraceMemory, kTraceUtility, -1,
+                   "Potential memory leak in ListWrapper");
+        // Remove all remaining list items.
+        while (Erase(First()) == 0)
+        {}
+    }
+}
+
+bool ListWrapper::Empty() const
+{
+    return list_.empty();
+}
+
+unsigned int ListWrapper::GetSize() const
+{
+    return list_.size();
+}
+
+int ListWrapper::PushBack(const void* ptr)
+{
+    ListItem* item = new ListItem(ptr);
+    list_.push_back(item);
+    return 0;
+}
+
+int ListWrapper::PushBack(const unsigned int item_id)
+{
+    ListItem* item = new ListItem(item_id);
+    list_.push_back(item);
+    return 0;
+}
+
+int ListWrapper::PushFront(const unsigned int item_id)
+{
+    ListItem* item = new ListItem(item_id);
+    list_.push_front(item);
+    return 0;
+}
+
+int ListWrapper::PushFront(const void* ptr)
+{
+    ListItem* item = new ListItem(ptr);
+    list_.push_front(item);
+    return 0;
+}
+
+int ListWrapper::PopFront()
+{
+    if(list_.empty())
+    {
+        return -1;
+    }
+    list_.pop_front();
+    return 0;
+}
+
+int ListWrapper::PopBack()
+{
+    if(list_.empty())
+    {
+        return -1;
+    }
+    list_.pop_back();
+    return 0;
+}
+
+ListItem* ListWrapper::First() const
+{
+    if(list_.empty())
+    {
+        return NULL;
+    }
+    std::list<ListItem*>::iterator item_iter = list_.begin();
+    ListItem* return_item = (*item_iter);
+    return_item->this_iter_ = item_iter;
+    return return_item;
+}
+
+ListItem* ListWrapper::Last() const
+{
+    if(list_.empty())
+    {
+        return NULL;
+    }
+    // std::list::end() addresses the last item + 1. Decrement so that the
+    // actual last is accessed.
+    std::list<ListItem*>::iterator item_iter = list_.end();
+    --item_iter;
+    ListItem* return_item = (*item_iter);
+    return_item->this_iter_ = item_iter;
+    return return_item;
+}
+
+ListItem* ListWrapper::Next(ListItem* item) const
+{
+    if(item == NULL)
+    {
+        return NULL;
+    }
+    std::list<ListItem*>::iterator item_iter = item->this_iter_;
+    ++item_iter;
+    if (item_iter == list_.end())
+    {
+        return NULL;
+    }
+    ListItem* return_item = (*item_iter);
+    return_item->this_iter_ = item_iter;
+    return return_item;
+}
+
+ListItem* ListWrapper::Previous(ListItem* item) const
+{
+    if(item == NULL)
+    {
+        return NULL;
+    }
+    std::list<ListItem*>::iterator item_iter = item->this_iter_;
+    if (item_iter == list_.begin())
+    {
+      return NULL;
+    }
+    --item_iter;
+    ListItem* return_item = (*item_iter);
+    return_item->this_iter_ = item_iter;
+    return return_item;
+}
+
+int ListWrapper::Insert(ListItem* existing_previous_item,
+                        ListItem* new_item)
+{
+    // Allow existingPreviousItem to be NULL if the list is empty.
+    // TODO (hellner) why allow this? Keep it as is for now to avoid
+    // breaking API contract.
+    if (!existing_previous_item && !Empty())
+    {
+        return -1;
+    }
+
+    if (!new_item)
+    {
+        return -1;
+    }
+
+    std::list<ListItem*>::iterator insert_location = list_.begin();
+    if (!Empty())
+    {
+        insert_location = existing_previous_item->this_iter_;
+        if(insert_location != list_.end())
+        {
+            ++insert_location;
+        }
+    }
+
+    list_.insert(insert_location,new_item);
+    return 0;
+}
+
+int ListWrapper::InsertBefore(ListItem* existing_next_item,
+                           ListItem* new_item)
+{
+    // Allow existing_next_item to be NULL if the list is empty.
+    // Todo: why allow this? Keep it as is for now to avoid breaking API
+    // contract.
+    if (!existing_next_item && !Empty())
+    {
+        return -1;
+    }
+    if (!new_item)
+    {
+        return -1;
+    }
+
+    std::list<ListItem*>::iterator insert_location = list_.begin();
+    if (!Empty())
+    {
+        insert_location = existing_next_item->this_iter_;
+    }
+
+    list_.insert(insert_location,new_item);
+    return 0;
+}
+
+int ListWrapper::Erase(ListItem* item)
+{
+    if(item == NULL)
+    {
+        return -1;
+    }
+    list_.erase(item->this_iter_);
+    return 0;
+}
+} // namespace webrtc

system_wrappers/source/list_stl.h

@@ -0,0 +1,66 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_SYSTEM_WRAPPERS_SOURCE_LIST_STL_H_
+#define WEBRTC_SYSTEM_WRAPPERS_SOURCE_LIST_STL_H_
+
+#include <list>
+
+#include "constructor_magic.h"
+
+namespace webrtc {
+class ListItem
+{
+friend class ListWrapper;
+
+public:
+    ListItem(const void* ptr);
+    ListItem(const unsigned int item);
+    virtual ~ListItem();
+    void* GetItem() const;
+    unsigned int GetUnsignedItem() const;
+
+private:
+    mutable std::list<ListItem*>::iterator this_iter_;
+    const void*         item_ptr_;
+    const unsigned int  item_;
+    DISALLOW_COPY_AND_ASSIGN(ListItem);
+};
+
+class ListWrapper
+{
+public:
+    ListWrapper();
+    ~ListWrapper();
+
+    // ListWrapper functions
+    unsigned int GetSize() const;
+    int PushBack(const void* ptr);
+    int PushBack(const unsigned int item_id);
+    int PushFront(const void* ptr);
+    int PushFront(const unsigned int item_id);
+    int PopFront();
+    int PopBack();
+    bool Empty() const;
+    ListItem* First() const;
+    ListItem* Last() const;
+    ListItem* Next(ListItem* item) const;
+    ListItem* Previous(ListItem* item) const;
+    int Erase(ListItem* item);
+    int Insert(ListItem* existing_previous_item, ListItem* new_item);
+    int InsertBefore(ListItem* existing_next_item, ListItem* new_item);
+
+private:
+    mutable std::list<ListItem*> list_;
+    DISALLOW_COPY_AND_ASSIGN(ListWrapper);
+};
+} // namespace webrtc
+
+#endif // WEBRTC_SYSTEM_WRAPPERS_SOURCE_LIST_STL_H_

system_wrappers/source/map.cc

@@ -0,0 +1,166 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "map_wrapper.h"
+
+#include "trace.h"
+
+namespace webrtc {
+MapItem::MapItem(int id, void* item) : item_pointer_(item), item_id_(id)
+{
+}
+
+MapItem::~MapItem()
+{
+}
+
+void* MapItem::GetItem()
+{
+    return item_pointer_;
+}
+
+int MapItem::GetId()
+{
+    return item_id_;
+}
+
+unsigned int MapItem::GetUnsignedId()
+{
+    return static_cast<unsigned int>(item_id_);
+}
+
+void MapItem::SetItem(void* ptr)
+{
+    item_pointer_ = ptr;
+}
+
+MapWrapper::MapWrapper() : map_()
+{
+}
+
+MapWrapper::~MapWrapper()
+{
+    if (!map_.empty())
+    {
+        WEBRTC_TRACE(kTraceMemory, kTraceUtility, -1,
+                   "Potential memory leak in MapWrapper");
+        // Remove all map items. Please note that std::map::clear() can't be
+        // used because each item has some dynamically allocated memory
+        // associated with it (i.e. using std::map::clear would introduce a
+        // memory leak).
+        while (Erase(First()) == 0)
+        {}
+    }
+}
+
+int MapWrapper::Size() const
+{
+    return (int)map_.size();
+}
+
+int MapWrapper::Insert(int id, void* ptr)
+{
+    map_[id] = new MapItem(id,ptr);
+    return 0;
+}
+
+MapItem* MapWrapper::First() const
+{
+    std::map<int, MapItem*>::const_iterator it = map_.begin();
+    if (it != map_.end())
+    {
+        return it->second;
+    }
+    return 0;
+}
+
+MapItem* MapWrapper::Last() const
+{
+    std::map<int, MapItem*>::const_reverse_iterator it = map_.rbegin();
+    if (it != map_.rend())
+    {
+        return it->second;
+    }
+    return 0;
+}
+
+MapItem* MapWrapper::Next(MapItem* item) const
+{
+    if (item == 0)
+    {
+        return 0;
+    }
+    std::map<int, MapItem*>::const_iterator it = map_.find(item->item_id_);
+    if (it != map_.end())
+    {
+        it++;
+        if (it != map_.end())
+        {
+            return it->second;
+        }
+    }
+    return 0;
+}
+
+MapItem* MapWrapper::Previous(MapItem* item) const
+{
+    if (item == 0)
+    {
+        return 0;
+    }
+
+    std::map<int, MapItem*>::const_iterator it = map_.find(item->item_id_);
+    if ((it != map_.end()) &&
+       (it != map_.begin()))
+    {
+        --it;
+        return it->second;
+    }
+    return 0;
+}
+
+MapItem* MapWrapper::Find(int id) const
+{
+    std::map<int, MapItem*>::const_iterator it = map_.find(id);
+    if (it != map_.end())
+    {
+        return it->second;
+    }
+    return 0;
+}
+
+int MapWrapper::Erase(MapItem* item)
+{
+    if (item == 0)
+    {
+        return -1;
+    }
+    std::map<int, MapItem*>::iterator it = map_.find(item->item_id_);
+    if (it != map_.end())
+    {
+        delete it->second;
+        map_.erase(it);
+        return 0;
+    }
+    return -1;
+}
+
+int MapWrapper::Erase(const int id)
+{
+    std::map<int, MapItem*>::iterator it = map_.find(id);
+    if (it != map_.end())
+    {
+        delete it->second;
+        map_.erase(it);
+        return 0;
+    }
+    return -1;
+}
+} // namespace webrtc

system_wrappers/source/map_no_stl.cc

@@ -0,0 +1,217 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "map_no_stl.h"
+
+#include "critical_section_wrapper.h"
+#include "trace.h"
+
+namespace webrtc {
+MapNoStlItem::MapNoStlItem(int id, void* item)
+    : next_(0),
+      prev_(0),
+      item_id_(id),
+      item_ptr_(item)
+{
+}
+
+MapNoStlItem::~MapNoStlItem()
+{
+}
+
+void* MapNoStlItem::GetItem()
+{
+    return item_ptr_;
+}
+
+int MapNoStlItem::GetId()
+{
+    return item_id_;
+}
+
+unsigned int MapNoStlItem::GetUnsignedId()
+{
+    return static_cast<unsigned int>(item_id_);
+}
+
+void MapNoStlItem::SetItem(void* ptr)
+{
+    item_ptr_ = ptr;
+}
+
+MapNoStl::MapNoStl()
+    : critical_section_(CriticalSectionWrapper::CreateCriticalSection()),
+      first_(0),
+      last_(0),
+      size_(0)
+{
+}
+
+MapNoStl::~MapNoStl()
+{
+    if (First())
+    {
+        WEBRTC_TRACE(kTraceMemory, kTraceUtility, -1,
+                   "Potential memory leak in MapNoStl");
+        while (Erase(First()) == 0)
+        {}
+    }
+    delete critical_section_;
+}
+
+int MapNoStl::Size() const
+{
+    return size_;
+}
+
+int MapNoStl::Insert(int id, void* ptr)
+{
+    MapNoStlItem* new_item = new MapNoStlItem(id, ptr);
+
+    CriticalSectionScoped lock(*critical_section_);
+    MapNoStlItem* item = first_;
+    size_++;
+    if (!item)
+    {
+        first_ = new_item;
+        last_ = new_item;
+        return 0;
+    }
+    while(item->next_)
+    {
+        // Three scenarios
+        // 1. Item should be inserted first.
+        // 2. Item should be inserted between two items
+        // 3. Item should be inserted last
+        if (item->GetId() > id)
+        {
+            new_item->next_ = item;
+            item->prev_ = new_item;
+            if (item == first_)
+            {
+                first_ = new_item;
+            }
+            else
+            {
+                new_item->prev_ = item->prev_;
+                new_item->prev_->next_ = new_item;
+            }
+            return 0;
+        }
+        item = item->next_;
+    }
+    // 3
+    item->next_ = new_item;
+    new_item->prev_ = item;
+    last_ = new_item;
+    return 0;
+}
+
+MapNoStlItem* MapNoStl::First() const
+{
+    return first_;
+}
+
+MapNoStlItem* MapNoStl::Last() const
+{
+    return last_;
+}
+
+MapNoStlItem* MapNoStl::Next(MapNoStlItem* item) const
+{
+    if (!item)
+    {
+        return 0;
+    }
+    return item->next_;
+}
+
+MapNoStlItem* MapNoStl::Previous(MapNoStlItem* item) const
+{
+    if (!item)
+    {
+        return 0;
+    }
+    return item->prev_;
+}
+
+MapNoStlItem* MapNoStl::Find(int id) const
+{
+    CriticalSectionScoped lock(*critical_section_);
+    MapNoStlItem* item = Locate(id);
+    return item;
+}
+
+int MapNoStl::Erase(MapNoStlItem* item)
+{
+    if(!item)
+    {
+        return -1;
+    }
+    CriticalSectionScoped lock(*critical_section_);
+    return Remove(item);
+}
+
+int MapNoStl::Erase(const int id)
+{
+    CriticalSectionScoped lock(*critical_section_);
+    MapNoStlItem* item = Locate(id);
+    if(!item)
+    {
+        return -1;
+    }
+    return Remove(item);
+}
+
+MapNoStlItem* MapNoStl::Locate(int id) const
+{
+    MapNoStlItem* item = first_;
+    while(item)
+    {
+        if (item->GetId() == id)
+        {
+            return item;
+        }
+        item = item->next_;
+    }
+    return 0;
+}
+
+int MapNoStl::Remove(MapNoStlItem* item)
+{
+    if (!item)
+    {
+        return -1;
+    }
+    size_--;
+    MapNoStlItem* previous_item = item->prev_;
+    MapNoStlItem* next_item = item->next_;
+    if (!previous_item)
+    {
+        next_item->prev_ = 0;
+        first_ = next_item;
+    }
+    else
+    {
+        previous_item->next_ = next_item;
+    }
+    if (!next_item)
+    {
+        previous_item->next_ = 0;
+        last_ = previous_item;
+    }
+    else
+    {
+        next_item->prev_ = previous_item;
+    }
+    delete item;
+    return 0;
+}
+} // namespace webrtc

system_wrappers/source/map_no_stl.h

@@ -0,0 +1,70 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_SYSTEM_WRAPPERS_SOURCE_MAP_NO_STL_H_
+#define WEBRTC_SYSTEM_WRAPPERS_SOURCE_MAP_NO_STL_H_
+
+#include "constructor_magic.h"
+
+namespace webrtc {
+class CriticalSectionWrapper;
+
+class MapNoStlItem
+{
+friend class Map;
+
+public:
+    MapNoStlItem(int id, void* ptr);
+    virtual ~MapNoStlItem();
+    void* GetItem();
+    int GetId();
+    unsigned int GetUnsignedId();
+    void SetItem(void* ptr);
+
+protected:
+    MapNoStlItem* next_;
+    MapNoStlItem* prev_;
+
+private:
+    int item_id_;
+    void* item_ptr_;
+    DISALLOW_COPY_AND_ASSIGN(MapNoStlItem);
+};
+
+class MapNoStl
+{
+public:
+    MapNoStl();
+    virtual ~MapNoStl();
+
+    // MapWrapper functions.
+    int Insert(int id, void* ptr);
+    int Erase(MapNoStlItem* item);
+    int Erase(int id);
+    int Size() const;
+    MapNoStlItem* First() const;
+    MapNoStlItem* Last() const;
+    MapNoStlItem* Next(MapNoStlItem* item) const;
+    MapNoStlItem* Previous(MapNoStlItem* item) const;
+    MapNoStlItem* Find(int id) const;
+
+private:
+    MapNoStlItem* Locate(int id) const;
+    int Remove(MapNoStlItem* item);
+
+    CriticalSection* critical_section_;
+    MapNoStlItem* first_;
+    MapNoStlItem* last_;
+    int size_;
+    DISALLOW_COPY_AND_ASSIGN(MapNoStl);
+};
+} // namespace webrtc
+
+#endif // WEBRTC_SYSTEM_WRAPPERS_SOURCE_MAP_NO_STL_H_

system_wrappers/source/rw_lock.cc

@@ -0,0 +1,46 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "rw_lock_wrapper.h"
+
+#include <assert.h>
+
+#if defined(_WIN32)
+    #include "rw_lock_windows.h"
+#elif defined(ANDROID)
+    #include <stdlib.h>
+    #include "rw_lock_generic.h"
+#else
+    #include "rw_lock_linux.h"
+#endif
+
+namespace webrtc {
+RWLockWrapper* RWLockWrapper::CreateRWLock()
+{
+#ifdef _WIN32
+    RWLockWrapper* lock =  new RWLockWindows();
+#elif defined(ANDROID)
+    RWLockWrapper* lock =  new RWLockWrapperGeneric();
+#else
+    RWLockWrapper* lock =  new RWLockLinux();
+#endif
+    if(lock->Init() != 0)
+    {
+        delete lock;
+        assert(false);
+        return NULL;
+    }
+    return lock;
+}
+
+RWLockWrapper::~RWLockWrapper()
+{
+}
+} // namespace webrtc

system_wrappers/source/rw_lock_generic.cc

@@ -0,0 +1,106 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "rw_lock_generic.h"
+
+#include "condition_variable_wrapper.h"
+#include "critical_section_wrapper.h"
+
+namespace webrtc {
+RWLockWrapperGeneric::RWLockWrapperGeneric()
+    : _readersActive(0),
+      _writerActive(false),
+      _readersWaiting(0),
+      _writersWaiting(0)
+{
+    _critSectPtr  = CriticalSectionWrapper::CreateCriticalSection();
+    _readCondPtr  = ConditionVariableWrapper::CreateConditionVariable();
+    _writeCondPtr = ConditionVariableWrapper::CreateConditionVariable();
+}
+
+RWLockWrapperGeneric::~RWLockWrapperGeneric()
+{
+    delete _writeCondPtr;
+    delete _readCondPtr;
+    delete _critSectPtr;
+}
+
+int RWLockWrapperGeneric::Init()
+{
+    return 0;
+}
+
+void RWLockWrapperGeneric::AcquireLockExclusive()
+{
+    _critSectPtr->Enter();
+
+    if (_writerActive || _readersActive > 0)
+    {
+        ++_writersWaiting;
+
+        while (_writerActive || _readersActive > 0)
+        {
+            _writeCondPtr->SleepCS(*_critSectPtr);
+        }
+
+        --_writersWaiting;
+    }
+    _writerActive = true;
+    _critSectPtr->Leave();
+}
+
+void RWLockWrapperGeneric::ReleaseLockExclusive()
+{
+    _critSectPtr->Enter();
+
+    _writerActive = false;
+
+    if (_writersWaiting > 0)
+    {
+        _writeCondPtr->Wake();
+
+    }else if (_readersWaiting > 0)
+    {
+        _readCondPtr->WakeAll();
+    }
+    _critSectPtr->Leave();
+}
+
+void RWLockWrapperGeneric::AcquireLockShared()
+{
+    _critSectPtr->Enter();
+
+    if (_writerActive || _writersWaiting > 0)
+    {
+        ++_readersWaiting;
+
+        while (_writerActive || _writersWaiting > 0)
+        {
+            _readCondPtr->SleepCS(*_critSectPtr);
+        }
+        --_readersWaiting;
+    }
+    ++_readersActive;
+    _critSectPtr->Leave();
+}
+
+void RWLockWrapperGeneric::ReleaseLockShared()
+{
+    _critSectPtr->Enter();
+
+    --_readersActive;
+
+    if (_readersActive == 0 && _writersWaiting > 0)
+    {
+        _writeCondPtr->Wake();
+    }
+    _critSectPtr->Leave();
+}
+} // namespace webrtc

system_wrappers/source/rw_lock_generic.h

@@ -0,0 +1,46 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_SYSTEM_WRAPPERS_SOURCE_RW_LOCK_GENERIC_H_
+#define WEBRTC_SYSTEM_WRAPPERS_SOURCE_RW_LOCK_GENERIC_H_
+
+#include "rw_lock_wrapper.h"
+
+namespace webrtc {
+class CriticalSectionWrapper;
+class ConditionVariableWrapper;
+
+class RWLockWrapperGeneric : public RWLockWrapper
+{
+public:
+    RWLockWrapperGeneric();
+    virtual ~RWLockWrapperGeneric();
+
+    virtual void AcquireLockExclusive();
+    virtual void ReleaseLockExclusive();
+
+    virtual void AcquireLockShared();
+    virtual void ReleaseLockShared();
+
+protected:
+    virtual int Init();
+
+private:
+    CriticalSectionWrapper*   _critSectPtr;
+    ConditionVariableWrapper* _readCondPtr;
+    ConditionVariableWrapper* _writeCondPtr;
+
+    int  _readersActive;
+    bool _writerActive;
+    int  _readersWaiting;
+    int  _writersWaiting;
+};
+} // namespace webrtc
+#endif // WEBRTC_SYSTEM_WRAPPERS_SOURCE_RW_LOCK_GENERIC_H_

system_wrappers/source/rw_lock_linux.cc

@@ -0,0 +1,47 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "rw_lock_linux.h"
+
+namespace webrtc {
+RWLockLinux::RWLockLinux() : _lock()
+{
+}
+
+RWLockLinux::~RWLockLinux()
+{
+    pthread_rwlock_destroy(&_lock);
+}
+
+int RWLockLinux::Init()
+{
+    return pthread_rwlock_init(&_lock, 0);
+}
+
+void RWLockLinux::AcquireLockExclusive()
+{
+    pthread_rwlock_wrlock(&_lock);
+}
+
+void RWLockLinux::ReleaseLockExclusive()
+{
+    pthread_rwlock_unlock(&_lock);
+}
+
+void RWLockLinux::AcquireLockShared()
+{
+    pthread_rwlock_rdlock(&_lock);
+}
+
+void RWLockLinux::ReleaseLockShared()
+{
+    pthread_rwlock_unlock(&_lock);
+}
+} // namespace webrtc

system_wrappers/source/rw_lock_linux.h

@@ -0,0 +1,39 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_SYSTEM_WRAPPERS_SOURCE_RW_LOCK_LINUX_H_
+#define WEBRTC_SYSTEM_WRAPPERS_SOURCE_RW_LOCK_LINUX_H_
+
+#include "rw_lock_wrapper.h"
+
+#include <pthread.h>
+
+namespace webrtc {
+class RWLockLinux : public RWLockWrapper
+{
+public:
+    RWLockLinux();
+    virtual ~RWLockLinux();
+
+    virtual void AcquireLockExclusive();
+    virtual void ReleaseLockExclusive();
+
+    virtual void AcquireLockShared();
+    virtual void ReleaseLockShared();
+
+protected:
+    virtual int Init();
+
+private:
+    pthread_rwlock_t _lock;
+};
+} // namespace webrtc
+
+#endif // WEBRTC_SYSTEM_WRAPPERS_SOURCE_RW_LOCK_LINUX_H_

system_wrappers/source/rw_lock_windows.cc

@@ -0,0 +1,186 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "rw_lock_windows.h"
+
+#include "critical_section_wrapper.h"
+#include "condition_variable_wrapper.h"
+#include "trace.h"
+
+// TODO (hellner) why not just use the rw_lock_generic.cc solution if
+//                           native is not supported? Unnecessary redundancy!
+
+namespace webrtc {
+bool RWLockWindows::_winSupportRWLockPrimitive = false;
+static HMODULE library = NULL;
+
+PInitializeSRWLock       _PInitializeSRWLock;
+PAcquireSRWLockExclusive _PAcquireSRWLockExclusive;
+PAcquireSRWLockShared    _PAcquireSRWLockShared;
+PReleaseSRWLockShared    _PReleaseSRWLockShared;
+PReleaseSRWLockExclusive _PReleaseSRWLockExclusive;
+
+RWLockWindows::RWLockWindows()
+    : _critSectPtr(NULL),
+      _readCondPtr(NULL),
+      _writeCondPtr(NULL),
+      _readersActive(0),
+      _writerActive(false),
+      _readersWaiting(0),
+      _writersWaiting(0)
+{
+}
+
+RWLockWindows::~RWLockWindows()
+{
+    delete _writeCondPtr;
+    delete _readCondPtr;
+    delete _critSectPtr;
+}
+
+int RWLockWindows::Init()
+{
+    if(!library)
+    {
+        // Use native implementation if supported (i.e Vista+)
+        library = LoadLibrary(TEXT("Kernel32.dll"));
+        if(library)
+        {
+            WEBRTC_TRACE(kTraceStateInfo, kTraceUtility, -1,
+                         "Loaded Kernel.dll");
+
+            _PInitializeSRWLock =
+                (PInitializeSRWLock)GetProcAddress(
+                    library,
+                    "InitializeSRWLock");
+
+            _PAcquireSRWLockExclusive =
+               (PAcquireSRWLockExclusive)GetProcAddress(
+                   library,
+                   "AcquireSRWLockExclusive");
+            _PReleaseSRWLockExclusive =
+                (PReleaseSRWLockExclusive)GetProcAddress(
+                    library,
+                    "ReleaseSRWLockExclusive");
+            _PAcquireSRWLockShared =
+                (PAcquireSRWLockShared)GetProcAddress(
+                    library,
+                    "AcquireSRWLockShared");
+            _PReleaseSRWLockShared =
+                (PReleaseSRWLockShared)GetProcAddress(
+                    library,
+                    "ReleaseSRWLockShared");
+
+            if( _PInitializeSRWLock &&
+                _PAcquireSRWLockExclusive &&
+                _PReleaseSRWLockExclusive &&
+                _PAcquireSRWLockShared &&
+                _PReleaseSRWLockShared )
+            {
+                WEBRTC_TRACE(kTraceStateInfo, kTraceUtility, -1,
+                            "Loaded Simple RW Lock");
+                _winSupportRWLockPrimitive = true;
+            }
+        }
+    }
+    if(_winSupportRWLockPrimitive)
+    {
+        _PInitializeSRWLock(&_lock);
+    } else {
+        _critSectPtr  = CriticalSectionWrapper::CreateCriticalSection();
+        _readCondPtr  = ConditionVariableWrapper::CreateConditionVariable();
+        _writeCondPtr = ConditionVariableWrapper::CreateConditionVariable();
+    }
+    return 0;
+}
+
+void RWLockWindows::AcquireLockExclusive()
+{
+    if (_winSupportRWLockPrimitive)
+    {
+        _PAcquireSRWLockExclusive(&_lock);
+    } else {
+        _critSectPtr->Enter();
+
+        if (_writerActive || _readersActive > 0)
+        {
+            ++_writersWaiting;
+            while (_writerActive || _readersActive > 0)
+            {
+                _writeCondPtr->SleepCS(*_critSectPtr);
+            }
+            --_writersWaiting;
+        }
+        _writerActive = true;
+        _critSectPtr->Leave();
+    }
+}
+
+void RWLockWindows::ReleaseLockExclusive()
+{
+    if(_winSupportRWLockPrimitive)
+    {
+        _PReleaseSRWLockExclusive(&_lock);
+    } else {
+        _critSectPtr->Enter();
+        _writerActive = false;
+        if (_writersWaiting > 0)
+        {
+            _writeCondPtr->Wake();
+
+        }else if (_readersWaiting > 0) {
+            _readCondPtr->WakeAll();
+        }
+        _critSectPtr->Leave();
+    }
+}
+
+void RWLockWindows::AcquireLockShared()
+{
+    if(_winSupportRWLockPrimitive)
+    {
+        _PAcquireSRWLockShared(&_lock);
+    } else
+    {
+        _critSectPtr->Enter();
+        if (_writerActive || _writersWaiting > 0)
+        {
+            ++_readersWaiting;
+
+            while (_writerActive || _writersWaiting > 0)
+            {
+                _readCondPtr->SleepCS(*_critSectPtr);
+            }
+            --_readersWaiting;
+        }
+        ++_readersActive;
+        _critSectPtr->Leave();
+    }
+}
+
+void RWLockWindows::ReleaseLockShared()
+{
+    if(_winSupportRWLockPrimitive)
+    {
+        _PReleaseSRWLockShared(&_lock);
+    } else
+    {
+        _critSectPtr->Enter();
+
+        --_readersActive;
+
+        if (_readersActive == 0 && _writersWaiting > 0)
+        {
+            _writeCondPtr->Wake();
+        }
+        _critSectPtr->Leave();
+    }
+}
+} // namespace webrtc

system_wrappers/source/rw_lock_windows.h

@@ -0,0 +1,71 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_SYSTEM_WRAPPERS_SOURCE_RW_LOCK_WINDOWS_H_
+#define WEBRTC_SYSTEM_WRAPPERS_SOURCE_RW_LOCK_WINDOWS_H_
+
+#include "rw_lock_wrapper.h"
+
+#include <Windows.h>
+
+#if !defined(RTL_SRWLOCK_INIT)
+    typedef struct _RTL_SRWLOCK
+    {
+        void* Ptr;
+    } RTL_SRWLOCK, *PRTL_SRWLOCK;
+    typedef RTL_SRWLOCK SRWLOCK, *PSRWLOCK;
+#endif
+
+namespace webrtc {
+class CriticalSectionWrapper;
+class ConditionVariableWrapper;
+
+typedef void (WINAPI *PInitializeSRWLock)(PSRWLOCK);
+
+typedef void (WINAPI *PAcquireSRWLockExclusive)(PSRWLOCK);
+typedef void (WINAPI *PReleaseSRWLockExclusive)(PSRWLOCK);
+
+typedef void (WINAPI *PAcquireSRWLockShared)(PSRWLOCK);
+typedef void (WINAPI *PReleaseSRWLockShared)(PSRWLOCK);
+
+
+class RWLockWindows :public RWLockWrapper
+{
+public:
+    RWLockWindows();
+    virtual ~RWLockWindows();
+
+    virtual void AcquireLockExclusive();
+    virtual void ReleaseLockExclusive();
+
+    virtual void AcquireLockShared();
+    virtual void ReleaseLockShared();
+
+protected:
+    virtual int Init();
+
+private:
+    // For native implementation.
+    static bool _winSupportRWLockPrimitive;
+    SRWLOCK     _lock;
+
+    // Genric implementation, fallback if native is not supported.
+    CriticalSectionWrapper*   _critSectPtr;
+    ConditionVariableWrapper* _readCondPtr;
+    ConditionVariableWrapper* _writeCondPtr;
+
+    int  _readersActive;
+    bool _writerActive;
+    int  _readersWaiting;
+    int  _writersWaiting;
+};
+} // namespace webrtc
+
+#endif // WEBRTC_SYSTEM_WRAPPERS_SOURCE_RW_LOCK_WINDOWS_H_

system_wrappers/source/sort.cc

@@ -0,0 +1,551 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+// When the platform supports STL, the functions are implemented using a
+// templated spreadsort algorithm (http://sourceforge.net/projects/spreadsort/),
+// part of the Boost C++ library collection. Otherwise, the C standard library's
+// qsort() will be used.
+
+#include "sort.h"
+
+#include <cassert>
+#include <cstring>  // memcpy
+#include <new>      // nothrow new
+
+#ifdef NO_STL
+#include <cstdlib>      // qsort
+#else
+#include <algorithm>    // std::sort
+#include <vector>
+#include "spreadsort.hpp" // TODO (ajm) upgrade to spreadsortv2.
+#endif
+
+#ifdef NO_STL
+#define COMPARE_DEREFERENCED(XT, YT)        \
+    do                                      \
+    {                                       \
+        if ((XT) > (YT))                    \
+        {                                   \
+            return 1;                       \
+        }                                   \
+        else if ((XT) < (YT))               \
+        {                                   \
+            return -1;                      \
+        }                                   \
+                                            \
+        return 0;                           \
+    }                                       \
+    while(0)
+
+#define COMPARE_FOR_QSORT(X, Y, TYPE)                               \
+    do                                                              \
+    {                                                               \
+        TYPE xT = static_cast<TYPE>(*static_cast<const TYPE*>(X));  \
+        TYPE yT = static_cast<TYPE>(*static_cast<const TYPE*>(Y));  \
+        COMPARE_DEREFERENCED(xT, yT);                               \
+    }                                                               \
+    while(0)
+
+#define COMPARE_KEY_FOR_QSORT(SORT_KEY_X, SORT_KEY_Y, TYPE)         \
+    do                                                              \
+    {                                                               \
+        TYPE xT = static_cast<TYPE>(*static_cast<TYPE*>             \
+            (static_cast<const SortKey*>(SORT_KEY_X)->key));        \
+        TYPE yT = static_cast<TYPE>(*static_cast<TYPE*>             \
+            (static_cast<const SortKey*>(SORT_KEY_Y)->key));        \
+        COMPARE_DEREFERENCED(xT, yT);                               \
+    }                                                               \
+    while(0)
+
+#define KEY_QSORT(SORT_KEY, KEY, NUM_OF_ELEMENTS, KEY_TYPE, COMPARE_FUNC)     \
+    do                                                                        \
+    {                                                                         \
+        KEY_TYPE* keyT = (KEY_TYPE*)(key);                                    \
+        for (WebRtc_UWord32 i = 0; i < (NUM_OF_ELEMENTS); i++)                \
+        {                                                                     \
+            ptrSortKey[i].key = &keyT[i];                                     \
+            ptrSortKey[i].index = i;                                          \
+        }                                                                     \
+                                                                              \
+        qsort((SORT_KEY), (NUM_OF_ELEMENTS), sizeof(SortKey), (COMPARE_FUNC));\
+    }                                                                         \
+    while(0)
+#endif
+
+namespace webrtc
+{
+#ifdef NO_STL
+    struct SortKey
+    {
+        void* key;
+        WebRtc_UWord32 index;
+    };
+#else
+    template<typename KeyType>
+    struct SortKey
+    {
+        KeyType key;
+        WebRtc_UWord32 index;
+    };
+#endif
+
+    namespace // Unnamed namespace provides internal linkage.
+    {
+#ifdef NO_STL
+        int CompareWord8(const void* x, const void* y)
+        {
+            COMPARE_FOR_QSORT(x, y, WebRtc_Word8);
+        }
+
+        int CompareUWord8(const void* x, const void* y)
+        {
+            COMPARE_FOR_QSORT(x, y, WebRtc_UWord8);
+        }
+
+        int CompareWord16(const void* x, const void* y)
+        {
+            COMPARE_FOR_QSORT(x, y, WebRtc_Word16);
+        }
+
+        int CompareUWord16(const void* x, const void* y)
+        {
+            COMPARE_FOR_QSORT(x, y, WebRtc_UWord16);
+        }
+
+        int CompareWord32(const void* x, const void* y)
+        {
+            COMPARE_FOR_QSORT(x, y, WebRtc_Word32);
+        }
+
+        int CompareUWord32(const void* x, const void* y)
+        {
+            COMPARE_FOR_QSORT(x, y, WebRtc_UWord32);
+        }
+
+        int CompareWord64(const void* x, const void* y)
+        {
+            COMPARE_FOR_QSORT(x, y, WebRtc_Word64);
+        }
+
+        int CompareUWord64(const void* x, const void* y)
+        {
+            COMPARE_FOR_QSORT(x, y, WebRtc_UWord64);
+        }
+
+        int CompareFloat32(const void* x, const void* y)
+        {
+            COMPARE_FOR_QSORT(x, y, float);
+        }
+
+        int CompareFloat64(const void* x, const void* y)
+        {
+            COMPARE_FOR_QSORT(x, y, double);
+        }
+
+        int CompareKeyWord8(const void* sortKeyX, const void* sortKeyY)
+        {
+            COMPARE_KEY_FOR_QSORT(sortKeyX, sortKeyY, WebRtc_Word8);
+        }
+
+        int CompareKeyUWord8(const void* sortKeyX, const void* sortKeyY)
+        {
+            COMPARE_KEY_FOR_QSORT(sortKeyX, sortKeyY, WebRtc_UWord8);
+        }
+
+        int CompareKeyWord16(const void* sortKeyX, const void* sortKeyY)
+        {
+            COMPARE_KEY_FOR_QSORT(sortKeyX, sortKeyY, WebRtc_Word16);
+        }
+
+        int CompareKeyUWord16(const void* sortKeyX, const void* sortKeyY)
+        {
+            COMPARE_KEY_FOR_QSORT(sortKeyX, sortKeyY, WebRtc_UWord16);
+        }
+
+        int CompareKeyWord32(const void* sortKeyX, const void* sortKeyY)
+        {
+            COMPARE_KEY_FOR_QSORT(sortKeyX, sortKeyY, WebRtc_Word32);
+        }
+
+        int CompareKeyUWord32(const void* sortKeyX, const void* sortKeyY)
+        {
+            COMPARE_KEY_FOR_QSORT(sortKeyX, sortKeyY, WebRtc_UWord32);
+        }
+
+        int CompareKeyWord64(const void* sortKeyX, const void* sortKeyY)
+        {
+            COMPARE_KEY_FOR_QSORT(sortKeyX, sortKeyY, WebRtc_Word64);
+        }
+
+        int CompareKeyUWord64(const void* sortKeyX, const void* sortKeyY)
+        {
+            COMPARE_KEY_FOR_QSORT(sortKeyX, sortKeyY, WebRtc_UWord64);
+        }
+
+        int CompareKeyFloat32(const void* sortKeyX, const void* sortKeyY)
+        {
+            COMPARE_KEY_FOR_QSORT(sortKeyX, sortKeyY, float);
+        }
+
+        int CompareKeyFloat64(const void* sortKeyX, const void* sortKeyY)
+        {
+            COMPARE_KEY_FOR_QSORT(sortKeyX, sortKeyY, double);
+        }
+#else
+        template <typename KeyType>
+        struct KeyLessThan
+        {
+            bool operator()(const SortKey<KeyType>& sortKeyX,
+                const SortKey<KeyType>& sortKeyY) const
+            {
+                return sortKeyX.key < sortKeyY.key;
+            }
+        };
+
+        template <typename KeyType>
+        struct KeyRightShift
+        {
+            KeyType operator()(const SortKey<KeyType>& sortKey,
+                const unsigned offset) const
+            {
+                return sortKey.key >> offset;
+            }
+        };
+
+        template <typename DataType>
+        inline void IntegerSort(void* data, WebRtc_UWord32 numOfElements)
+        {
+            DataType* dataT = static_cast<DataType*>(data);
+            boost::integer_sort(dataT, dataT + numOfElements);
+        }
+
+        template <typename DataType, typename IntegerType>
+        inline void FloatSort(void* data, WebRtc_UWord32 numOfElements)
+        {
+            DataType* dataT = static_cast<DataType*>(data);
+            IntegerType cVal = 0;
+            boost::float_sort_cast(dataT, dataT + numOfElements, cVal);
+        }
+
+        template <typename DataType>
+        inline void StdSort(void* data, WebRtc_UWord32 numOfElements)
+        {
+            DataType* dataT = static_cast<DataType*>(data);
+            std::sort(dataT, dataT + numOfElements);
+        }
+
+        template<typename KeyType>
+        inline WebRtc_Word32 SetupKeySort(void* key,
+                                          SortKey<KeyType>*& ptrSortKey,
+                                          WebRtc_UWord32 numOfElements)
+        {
+            ptrSortKey = new(std::nothrow) SortKey<KeyType>[numOfElements];
+            if (ptrSortKey == NULL)
+            {
+                return -1;
+            }
+
+            KeyType* keyT = static_cast<KeyType*>(key);
+            for (WebRtc_UWord32 i = 0; i < numOfElements; i++)
+            {
+                ptrSortKey[i].key = keyT[i];
+                ptrSortKey[i].index = i;
+            }
+
+            return 0;
+        }
+
+        template<typename KeyType>
+        inline WebRtc_Word32 TeardownKeySort(void* data,
+                                             SortKey<KeyType>* ptrSortKey,
+            WebRtc_UWord32 numOfElements, WebRtc_UWord32 sizeOfElement)
+        {
+            WebRtc_UWord8* ptrData = static_cast<WebRtc_UWord8*>(data);
+            WebRtc_UWord8* ptrDataSorted = new(std::nothrow) WebRtc_UWord8
+                [numOfElements * sizeOfElement];
+            if (ptrDataSorted == NULL)
+            {
+                return -1;
+            }
+
+            for (WebRtc_UWord32 i = 0; i < numOfElements; i++)
+            {
+                memcpy(ptrDataSorted + i * sizeOfElement, ptrData +
+                       ptrSortKey[i].index * sizeOfElement, sizeOfElement);
+            }
+            memcpy(ptrData, ptrDataSorted, numOfElements * sizeOfElement);
+            delete[] ptrSortKey;
+            delete[] ptrDataSorted;
+            return 0;
+        }
+
+        template<typename KeyType>
+        inline WebRtc_Word32 IntegerKeySort(void* data, void* key,
+                                            WebRtc_UWord32 numOfElements,
+                                            WebRtc_UWord32 sizeOfElement)
+        {
+            SortKey<KeyType>* ptrSortKey;
+            if (SetupKeySort<KeyType>(key, ptrSortKey, numOfElements) != 0)
+            {
+                return -1;
+            }
+
+            boost::integer_sort(ptrSortKey, ptrSortKey + numOfElements,
+                KeyRightShift<KeyType>(), KeyLessThan<KeyType>());
+
+            if (TeardownKeySort<KeyType>(data, ptrSortKey, numOfElements,
+                    sizeOfElement) != 0)
+            {
+                return -1;
+            }
+
+            return 0;
+        }
+
+        template<typename KeyType>
+        inline WebRtc_Word32 StdKeySort(void* data, void* key,
+                                        WebRtc_UWord32 numOfElements,
+                                        WebRtc_UWord32 sizeOfElement)
+        {
+            SortKey<KeyType>* ptrSortKey;
+            if (SetupKeySort<KeyType>(key, ptrSortKey, numOfElements) != 0)
+            {
+                return -1;
+            }
+
+            std::sort(ptrSortKey, ptrSortKey + numOfElements,
+                KeyLessThan<KeyType>());
+
+            if (TeardownKeySort<KeyType>(data, ptrSortKey, numOfElements,
+                    sizeOfElement) != 0)
+            {
+                return -1;
+            }
+
+            return 0;
+        }
+#endif
+    }
+
+    WebRtc_Word32 Sort(void* data, WebRtc_UWord32 numOfElements, Type type)
+    {
+        if (data == NULL)
+        {
+            return -1;
+        }
+
+#ifdef NO_STL
+        switch (type)
+        {
+        case TYPE_Word8:
+            qsort(data, numOfElements, sizeof(WebRtc_Word8), CompareWord8);
+            break;
+        case TYPE_UWord8:
+            qsort(data, numOfElements, sizeof(WebRtc_UWord8), CompareUWord8);
+            break;
+        case TYPE_Word16:
+            qsort(data, numOfElements, sizeof(WebRtc_Word16), CompareWord16);
+            break;
+        case TYPE_UWord16:
+            qsort(data, numOfElements, sizeof(WebRtc_UWord16), CompareUWord16);
+            break;
+        case TYPE_Word32:
+            qsort(data, numOfElements, sizeof(WebRtc_Word32), CompareWord32);
+            break;
+        case TYPE_UWord32:
+            qsort(data, numOfElements, sizeof(WebRtc_UWord32), CompareUWord32);
+            break;
+        case TYPE_Word64:
+            qsort(data, numOfElements, sizeof(WebRtc_Word64), CompareWord64);
+            break;
+        case TYPE_UWord64:
+            qsort(data, numOfElements, sizeof(WebRtc_UWord64), CompareUWord64);
+            break;
+        case TYPE_Float32:
+            qsort(data, numOfElements, sizeof(float), CompareFloat32);
+            break;
+        case TYPE_Float64:
+            qsort(data, numOfElements, sizeof(double), CompareFloat64);
+            break;
+        default:
+            return -1;
+        }
+#else
+        // Fall back to std::sort for 64-bit types and floats due to compiler
+	// warnings and VS 2003 build crashes respectively with spreadsort.
+        switch (type)
+        {
+        case TYPE_Word8:
+            IntegerSort<WebRtc_Word8>(data, numOfElements);
+            break;
+        case TYPE_UWord8:
+            IntegerSort<WebRtc_UWord8>(data, numOfElements);
+            break;
+        case TYPE_Word16:
+            IntegerSort<WebRtc_Word16>(data, numOfElements);
+            break;
+        case TYPE_UWord16:
+            IntegerSort<WebRtc_UWord16>(data, numOfElements);
+            break;
+        case TYPE_Word32:
+            IntegerSort<WebRtc_Word32>(data, numOfElements);
+            break;
+        case TYPE_UWord32:
+            IntegerSort<WebRtc_UWord32>(data, numOfElements);
+            break;
+        case TYPE_Word64:
+            StdSort<WebRtc_Word64>(data, numOfElements);
+            break;
+        case TYPE_UWord64:
+            StdSort<WebRtc_UWord64>(data, numOfElements);
+            break;
+        case TYPE_Float32:
+            StdSort<float>(data, numOfElements);
+            break;
+        case TYPE_Float64:
+            StdSort<double>(data, numOfElements);
+            break;
+        default:
+            return -1;
+        }
+#endif
+        return 0;
+    }
+
+    WebRtc_Word32 KeySort(void* data, void* key, WebRtc_UWord32 numOfElements,
+                          WebRtc_UWord32 sizeOfElement, Type keyType)
+    {
+        if (data == NULL)
+        {
+            return -1;
+        }
+
+        if (key == NULL)
+        {
+            return -1;
+        }
+
+        if ((WebRtc_UWord64)numOfElements * sizeOfElement > 0xffffffff)
+        {
+            return -1;
+        }
+
+#ifdef NO_STL
+        SortKey* ptrSortKey = new(std::nothrow) SortKey[numOfElements];
+        if (ptrSortKey == NULL)
+        {
+            return -1;
+        }
+
+        switch (keyType)
+        {
+        case TYPE_Word8:
+            KEY_QSORT(ptrSortKey, key, numOfElements, WebRtc_Word8,
+                CompareKeyWord8);
+            break;
+        case TYPE_UWord8:
+            KEY_QSORT(ptrSortKey, key, numOfElements, WebRtc_UWord8,
+                CompareKeyUWord8);
+            break;
+        case TYPE_Word16:
+            KEY_QSORT(ptrSortKey, key, numOfElements, WebRtc_Word16,
+                CompareKeyWord16);
+            break;
+        case TYPE_UWord16:
+            KEY_QSORT(ptrSortKey, key, numOfElements, WebRtc_UWord16,
+                CompareKeyUWord16);
+            break;
+        case TYPE_Word32:
+            KEY_QSORT(ptrSortKey, key, numOfElements, WebRtc_Word32,
+                CompareKeyWord32);
+            break;
+        case TYPE_UWord32:
+            KEY_QSORT(ptrSortKey, key, numOfElements, WebRtc_UWord32,
+                CompareKeyUWord32);
+            break;
+        case TYPE_Word64:
+            KEY_QSORT(ptrSortKey, key, numOfElements, WebRtc_Word64,
+                CompareKeyWord64);
+            break;
+        case TYPE_UWord64:
+            KEY_QSORT(ptrSortKey, key, numOfElements, WebRtc_UWord64,
+                CompareKeyUWord64);
+            break;
+        case TYPE_Float32:
+            KEY_QSORT(ptrSortKey, key, numOfElements, float,
+                CompareKeyFloat32);
+            break;
+        case TYPE_Float64:
+            KEY_QSORT(ptrSortKey, key, numOfElements, double,
+                CompareKeyFloat64);
+            break;
+        default:
+            return -1;
+        }
+
+        // Shuffle into sorted position based on index map.
+        WebRtc_UWord8* ptrData = static_cast<WebRtc_UWord8*>(data);
+        WebRtc_UWord8* ptrDataSorted = new(std::nothrow) WebRtc_UWord8
+            [numOfElements * sizeOfElement];
+        if (ptrDataSorted == NULL)
+        {
+            return -1;
+        }
+
+        for (WebRtc_UWord32 i = 0; i < numOfElements; i++)
+        {
+            memcpy(ptrDataSorted + i * sizeOfElement, ptrData +
+                ptrSortKey[i].index * sizeOfElement, sizeOfElement);
+        }
+        memcpy(ptrData, ptrDataSorted, numOfElements * sizeOfElement);
+
+        delete[] ptrSortKey;
+        delete[] ptrDataSorted;
+
+        return 0;
+#else
+        // Fall back to std::sort for 64-bit types and floats due to compiler
+	// warnings and errors respectively with spreadsort.
+        switch (keyType)
+        {
+        case TYPE_Word8:
+            return IntegerKeySort<WebRtc_Word8>(data, key, numOfElements,
+                                                sizeOfElement);
+        case TYPE_UWord8:
+            return IntegerKeySort<WebRtc_UWord8>(data, key, numOfElements,
+                                                 sizeOfElement);
+        case TYPE_Word16:
+            return IntegerKeySort<WebRtc_Word16>(data, key, numOfElements,
+                                                 sizeOfElement);
+        case TYPE_UWord16:
+            return IntegerKeySort<WebRtc_UWord16>(data, key, numOfElements,
+                                                  sizeOfElement);
+        case TYPE_Word32:
+            return IntegerKeySort<WebRtc_Word32>(data, key, numOfElements,
+                                                 sizeOfElement);
+        case TYPE_UWord32:
+            return IntegerKeySort<WebRtc_UWord32>(data, key, numOfElements,
+                                                  sizeOfElement);
+        case TYPE_Word64:
+            return StdKeySort<WebRtc_Word64>(data, key, numOfElements,
+                                             sizeOfElement);
+        case TYPE_UWord64:
+            return StdKeySort<WebRtc_UWord64>(data, key, numOfElements,
+                                              sizeOfElement);
+        case TYPE_Float32:
+            return StdKeySort<float>(data, key, numOfElements, sizeOfElement);
+        case TYPE_Float64:
+            return StdKeySort<double>(data, key, numOfElements, sizeOfElement);
+        default:
+            return -1;
+        }
+#endif
+    }
+} // namespace webrtc

system_wrappers/source/spreadsortlib/constants.hpp

@@ -0,0 +1,42 @@
+/*Boost Software License - Version 1.0 - August 17th, 2003
+
+Permission is hereby granted, free of charge, to any person or organization
+obtaining a copy of the software and accompanying documentation covered by
+this license (the "Software") to use, reproduce, display, distribute,
+execute, and transmit the Software, and to prepare derivative works of the
+Software, and to permit third-parties to whom the Software is furnished to
+do so, all subject to the following:
+
+The copyright notices in the Software and this entire statement, including
+the above license grant, this restriction and the following disclaimer,
+must be included in all copies of the Software, in whole or in part, and
+all derivative works of the Software, unless such copies or derivative
+works are solely in the form of machine-executable object code generated by
+a source language processor.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
+SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
+FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.*/
+#ifndef BOOST_SPREADSORT_CONSTANTS
+#define BOOST_SPREADSORT_CONSTANTS
+namespace boost {
+namespace detail {
+//Tuning constants
+//Sets the minimum number of items per bin.
+static const unsigned LOG_MEAN_BIN_SIZE = 2;
+//This should be tuned to your processor cache; if you go too large you get cache misses on bins
+//The smaller this number, the less worst-case memory usage.  If too small, too many recursions slow down spreadsort
+static const unsigned MAX_SPLITS = 10;
+//Used to force a comparison-based sorting for small bins, if it's faster.  Minimum value 0
+static const unsigned LOG_MIN_SPLIT_COUNT = 5;
+//There is a minimum size below which it is not worth using spreadsort
+static const long MIN_SORT_SIZE = 1000;
+//This is the constant on the log base n of m calculation; make this larger the faster std::sort is relative to spreadsort
+static const unsigned LOG_CONST = 2;
+}
+}
+#endif

system_wrappers/source/system_wrappers.gyp

@@ -0,0 +1,146 @@
+# Copyright (c) 2009 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# TODO: Rename files to use *_linux.cpp etc. names, to automatically include relevant files. Remove conditions section.
+
+{
+  'includes': [
+    '../../common_settings.gypi', # Common settings
+  ],
+  'targets': [
+    {
+      'target_name': 'system_wrappers',
+      'type': '<(library)',
+      'include_dirs': [
+        'spreadsortlib',
+        '../interface',
+      ],
+      'direct_dependent_settings': {
+        'include_dirs': [
+          '../interface',
+        ],
+      },
+      'sources': [
+        '../interface/aligned_malloc.h',
+        '../interface/atomic32_wrapper.h',
+        '../interface/condition_variable_wrapper.h',
+        '../interface/cpu_wrapper.h',
+        '../interface/cpu_features_wrapper.h',
+        '../interface/critical_section_wrapper.h',
+        '../interface/event_wrapper.h',
+        '../interface/file_wrapper.h',
+        '../interface/list_wrapper.h',
+        '../interface/map_wrapper.h',
+        '../interface/rw_lock_wrapper.h',
+        '../interface/sort.h',
+        '../interface/thread_wrapper.h',
+        '../interface/tick_util.h',
+        '../interface/trace.h',
+        'aligned_malloc.cc',
+        'atomic32.cc',
+        'atomic32_linux.h',
+        'atomic32_mac.h',
+        'atomic32_windows.h',
+        'condition_variable.cc',
+        'condition_variable_linux.h',
+        'condition_variable_windows.h',
+        'cpu.cc',
+        'cpu_linux.h',
+        'cpu_mac.h',
+        'cpu_windows.h',
+        'cpu_features.cc',
+        'critical_section.cc',
+        'critical_section_linux.h',
+        'critical_section_windows.h',
+        'event.cc',
+        'event_linux.h',
+        'event_windows.h',
+        'file_impl.cc',
+        'file_impl.h',
+        'list_no_stl.cc',
+        'map.cc',
+        'rw_lock.cc',
+        'rw_lock_linux.h',
+        'rw_lock_windows.h',
+        'sort.cc',
+        'thread.cc',
+        'thread_linux.h',
+        'thread_windows.h',
+        'trace_impl.cc',
+        'trace_impl.h',
+        'trace_linux.h',
+        'trace_windows.h',
+      ],
+      'conditions': [
+        ['OS=="linux"', {
+          'sources': [
+            'condition_variable_linux.cc',
+            'cpu_linux.cc',
+            'critical_section_linux.cc',
+            'event_linux.cc',
+            'thread_linux.cc',
+            'trace_linux.cc',
+            'rw_lock_linux.cc',
+          ],
+          'link_settings': {
+            'libraries': [
+              '-lrt',
+            ],
+          },
+        }],
+        ['OS=="mac"', {
+          'sources': [
+            'condition_variable_linux.cc',
+            'cpu_mac.cc',
+            'critical_section_linux.cc',
+            'event_linux.cc',
+            'rw_lock_linux.cc',
+            'thread_linux.cc',
+            'trace_linux.cc',
+          ],
+        }],
+        ['OS=="win"', {
+          'sources': [
+            'atomic32_windows.h',
+            'condition_variable_windows.cc',
+            'condition_variable_windows.h',
+            'cpu_windows.cc',
+            'cpu_windows.h',
+            'critical_section_windows.cc',
+            'critical_section_windows.h',
+            'event_windows.cc',
+            'event_windows.h',
+            'rw_lock_windows.cc',
+            'rw_lock_windows.h',
+            'thread_windows.cc',
+            'thread_windows.h',
+            'trace_windows.cc',
+            'trace_windows.h',
+          ],
+          'link_settings': {
+            'libraries': [
+              '-lwinmm.lib',
+            ],
+          },
+        }],
+	    ] # conditions
+    },
+    {
+      'target_name': 'system_wrappersTest',
+      'type': 'executable',
+      'dependencies': [
+        'system_wrappers'
+      ],
+      'sources': [
+        '../test/Test.cpp',
+      ],
+    },
+  ], # targets
+}
+
+# Local Variables:
+# tab-width:2
+# indent-tabs-mode:nil
+# End:
+# vim: set expandtab tabstop=2 shiftwidth=2:

system_wrappers/source/thread.cc

@@ -0,0 +1,30 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "thread_wrapper.h"
+
+#if defined(_WIN32)
+    #include "thread_windows.h"
+#else
+    #include "thread_linux.h"
+#endif
+
+namespace webrtc {
+ThreadWrapper* ThreadWrapper::CreateThread(ThreadRunFunction func,
+                                           ThreadObj obj, ThreadPriority prio,
+                                           const char* threadName)
+{
+#if defined(_WIN32)
+    return new ThreadWindows(func, obj, prio, threadName);
+#else
+    return ThreadLinux::Create(func, obj, prio, threadName);
+#endif
+}
+} // namespace webrtc

system_wrappers/source/thread_linux.cc

@@ -0,0 +1,340 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "thread_linux.h"
+
+#include <errno.h>
+#include <string.h> // strncpy
+#include <time.h>   // nanosleep
+#include <unistd.h>
+#ifdef WEBRTC_LINUX
+#include <sys/types.h>
+#include <sched.h>
+#include <sys/syscall.h>
+#include <linux/unistd.h>
+#include <sys/prctl.h>
+#endif
+
+#include "event_wrapper.h"
+#include "trace.h"
+
+namespace webrtc {
+extern "C"
+{
+    static void* StartThread(void* lpParameter)
+    {
+        static_cast<ThreadLinux*>(lpParameter)->Run();
+        return 0;
+    }
+}
+
+#if (defined(WEBRTC_LINUX) && !defined(ANDROID))
+static pid_t gettid()
+{
+#if defined(__NR_gettid)
+    return  syscall(__NR_gettid);
+#else
+    return -1;
+#endif
+}
+#endif
+
+ThreadWrapper* ThreadLinux::Create(ThreadRunFunction func, ThreadObj obj,
+                                   ThreadPriority prio, const char* threadName)
+{
+    ThreadLinux* ptr = new ThreadLinux(func, obj, prio, threadName);
+    if (!ptr)
+    {
+        return NULL;
+    }
+    const int error = ptr->Construct();
+    if (error)
+    {
+        delete ptr;
+        return NULL;
+    }
+    return ptr;
+}
+
+ThreadLinux::ThreadLinux(ThreadRunFunction func, ThreadObj obj,
+                         ThreadPriority prio, const char* threadName)
+    : _runFunction(func),
+      _obj(obj),
+      _alive(false),
+      _dead(true),
+      _prio(prio),
+      _event(EventWrapper::Create()),
+      _setThreadName(false)
+{
+#ifdef WEBRTC_LINUX
+    _linuxPid = -1;
+#endif
+    if (threadName != NULL)
+    {
+        _setThreadName = true;
+        strncpy(_name, threadName, kThreadMaxNameLength);
+    }
+}
+
+int ThreadLinux::Construct()
+{
+    int result = 0;
+#if !defined(ANDROID)
+    // Enable immediate cancellation if requested, see Shutdown()
+    result = pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL);
+    if (result != 0)
+    {
+        return -1;
+    }
+    result = pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, NULL);
+    if (result != 0)
+    {
+        return -1;
+    }
+#endif
+    result = pthread_attr_init(&_attr);
+    if (result != 0)
+    {
+        return -1;
+    }
+
+    return 0;
+}
+
+ThreadLinux::~ThreadLinux()
+{
+    pthread_attr_destroy(&_attr);
+    delete _event;
+}
+
+#define HAS_THREAD_ID !defined(MAC_IPHONE) && !defined(MAC_IPHONE_SIM)  &&  \
+                      !defined(WEBRTC_MAC) && !defined(WEBRTC_MAC_INTEL) && \
+                      !defined(MAC_DYLIB)  && !defined(MAC_INTEL_DYLIB)
+#if HAS_THREAD_ID
+bool ThreadLinux::Start(unsigned int& threadID)
+#else
+bool ThreadLinux::Start(unsigned int& /*threadID*/)
+#endif
+{
+    if (!_runFunction)
+    {
+        return false;
+    }
+    int result = pthread_attr_setdetachstate(&_attr, PTHREAD_CREATE_DETACHED);
+    // Set the stack stack size to 1M.
+    result |= pthread_attr_setstacksize(&_attr, 1024*1024);
+#ifdef WEBRTC_THREAD_RR
+    const int policy = SCHED_RR;
+#else
+    const int policy = SCHED_FIFO;
+#endif
+    _event->Reset();
+    result |= pthread_create(&_thread, &_attr, &StartThread, this);
+    if (result != 0)
+    {
+        return false;
+    }
+
+    // Wait up to 10 seconds for the OS to call the callback function. Prevents
+    // race condition if Stop() is called too quickly after start.
+    if (kEventSignaled != _event->Wait(WEBRTC_EVENT_10_SEC))
+    {
+        // Timed out. Something went wrong.
+        _runFunction = NULL;
+        return false;
+    }
+
+#if HAS_THREAD_ID
+    threadID = static_cast<unsigned int>(_thread);
+#endif
+    sched_param param;
+
+    const int minPrio = sched_get_priority_min(policy);
+    const int maxPrio = sched_get_priority_max(policy);
+    if ((minPrio == EINVAL) || (maxPrio == EINVAL))
+    {
+        return false;
+    }
+
+    switch (_prio)
+    {
+    case kLowPriority:
+        param.sched_priority = minPrio + 1;
+        break;
+    case kNormalPriority:
+        param.sched_priority = (minPrio + maxPrio) / 2;
+        break;
+    case kHighPriority:
+        param.sched_priority = maxPrio - 3;
+        break;
+    case kHighestPriority:
+        param.sched_priority = maxPrio - 2;
+        break;
+    case kRealtimePriority:
+        param.sched_priority = maxPrio - 1;
+        break;
+    default:
+        return false;
+    }
+    result = pthread_setschedparam(_thread, policy, &param);
+    if (result == EINVAL)
+    {
+        return false;
+    }
+    return true;
+}
+
+#if (defined(WEBRTC_LINUX) && !defined(ANDROID))
+bool ThreadLinux::SetAffinity(const int* processorNumbers,
+                              const unsigned int amountOfProcessors)
+{
+    if (!processorNumbers || (amountOfProcessors == 0))
+    {
+        return false;
+    }
+
+    cpu_set_t mask;
+    CPU_ZERO(&mask);
+
+    for(unsigned int processor = 0;
+        processor < amountOfProcessors;
+        processor++)
+    {
+        CPU_SET(processorNumbers[processor], &mask);
+    }
+    const int result = sched_setaffinity(_linuxPid, (unsigned int)sizeof(mask),
+                                         &mask);
+    if (result != 0)
+    {
+        return false;
+
+    }
+    return true;
+}
+#else
+// NOTE: On Mac OS X, use the Thread affinity API in
+// /usr/include/mach/thread_policy.h: thread_policy_set and mach_thread_self()
+// instead of Linux gettid() syscall.
+bool ThreadLinux::SetAffinity(const int* , const unsigned int)
+{
+    return false;
+}
+#endif
+
+void ThreadLinux::SetNotAlive()
+{
+    _alive = false;
+}
+
+bool ThreadLinux::Shutdown()
+{
+#if !defined(ANDROID)
+    if (_thread && (0 != pthread_cancel(_thread)))
+    {
+        return false;
+    }
+
+    return true;
+#else
+    return false;
+#endif
+}
+
+bool ThreadLinux::Stop()
+{
+    _alive = false;
+
+    // TODO (hellner) why not use an event here?
+    // Wait up to 10 seconds for the thread to terminate
+    for (int i = 0; i < 1000 && !_dead; i++)
+    {
+        timespec t;
+        t.tv_sec = 0;
+        t.tv_nsec = 10*1000*1000;
+        nanosleep(&t, NULL);
+    }
+    if (_dead)
+    {
+        return true;
+    }
+    else
+    {
+        return false;
+    }
+}
+
+void ThreadLinux::Run()
+{
+    _alive = true;
+    _dead  = false;
+#ifdef WEBRTC_LINUX
+    if(_linuxPid == -1)
+    {
+        _linuxPid = gettid();
+    }
+#endif
+    // The event the Start() is waiting for.
+    _event->Set();
+
+    if (_setThreadName)
+    {
+#ifdef WEBRTC_LINUX
+        WEBRTC_TRACE(kTraceStateInfo, kTraceUtility,-1,
+                     "Thread with id:%d name:%s started ", _linuxPid, _name);
+        prctl(PR_SET_NAME, (unsigned long)_name, 0, 0, 0);
+#else
+        WEBRTC_TRACE(kTraceStateInfo, kTraceUtility,-1,
+                     "Thread with name:%s started ", _name);
+#endif
+    }else
+    {
+#ifdef WEBRTC_LINUX
+        WEBRTC_TRACE(kTraceStateInfo, kTraceUtility, -1,
+                     "Thread with id:%d without name started", _linuxPid);
+#else
+        WEBRTC_TRACE(kTraceStateInfo, kTraceUtility, -1,
+                     "Thread without name started");
+#endif
+    }
+    do
+    {
+        if (_runFunction)
+        {
+            if (!_runFunction(_obj))
+            {
+                _alive = false;
+            }
+        }
+        else
+        {
+            _alive = false;
+        }
+    }
+    while (_alive);
+
+    if (_setThreadName)
+    {
+        // Don't set the name for the trace thread because it may cause a
+        // deadlock. TODO (hellner) there should be a better solution than
+        // coupling the thread and the trace class like this.
+        if (strcmp(_name, "Trace"))
+        {
+            WEBRTC_TRACE(kTraceStateInfo, kTraceUtility,-1,
+                         "Thread with name:%s stopped", _name);
+        }
+    }
+    else
+    {
+        WEBRTC_TRACE(kTraceStateInfo, kTraceUtility,-1,
+                     "Thread without name stopped");
+    }
+    _dead = true;
+}
+} // namespace webrtc

system_wrappers/source/thread_linux.h

@@ -0,0 +1,69 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_SYSTEM_WRAPPERS_SOURCE_THREAD_LINUX_H_
+#define WEBRTC_SYSTEM_WRAPPERS_SOURCE_THREAD_LINUX_H_
+
+#include "thread_wrapper.h"
+#include <pthread.h>
+
+namespace webrtc {
+class EventWrapper;
+
+class ThreadLinux : public ThreadWrapper
+{
+public:
+    static ThreadWrapper* Create(ThreadRunFunction func, ThreadObj obj,
+                                 ThreadPriority prio, const char* threadName);
+
+    ThreadLinux(ThreadRunFunction func, ThreadObj obj, ThreadPriority prio,
+                const char* threadName);
+    ~ThreadLinux();
+
+    // From ThreadWrapper
+    virtual void SetNotAlive();
+    virtual bool Start(unsigned int& id);
+    // Not implemented on Mac
+    virtual bool SetAffinity(const int* processorNumbers,
+                             unsigned int amountOfProcessors);
+    virtual bool Stop();
+    virtual bool Shutdown();
+
+    void Run();
+
+private:
+    int Construct();
+
+private:
+    // processing function
+    ThreadRunFunction   _runFunction;
+    ThreadObj           _obj;
+
+    // internal state
+    bool                    _alive;
+    bool                    _dead;
+    ThreadPriority          _prio;
+    EventWrapper*           _event;
+
+    // zero-terminated thread name string
+    char                    _name[kThreadMaxNameLength];
+    bool                    _setThreadName;
+
+    // handle to thread
+    pthread_attr_t          _attr;
+    pthread_t               _thread;
+#ifdef WEBRTC_LINUX
+    pid_t                   _linuxPid;
+#endif
+
+};
+} // namespace webrtc
+
+#endif // WEBRTC_SYSTEM_WRAPPERS_SOURCE_THREAD_LINUX_H_

system_wrappers/source/thread_windows.cc

@@ -0,0 +1,234 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "thread_windows.h"
+
+#include <assert.h>
+#include <process.h>
+#include <stdio.h>
+#include <windows.h>
+
+#include "thread_windows_set_name.h"
+#include "trace.h"
+
+#if defined(_WIN32)
+// VS 2005: Disable warnings for default initialized arrays.
+#pragma warning(disable:4351)
+#endif
+
+namespace webrtc {
+ThreadWindows::ThreadWindows(ThreadRunFunction func, ThreadObj obj,
+                             ThreadPriority prio, const char* threadName)
+    : ThreadWrapper(),
+      _runFunction(func),
+      _obj(obj),
+      _alive(false),
+      _dead(true),
+      _doNotCloseHandle(false),
+      _prio(prio),
+      _event(NULL),
+      _thread(NULL),
+      _id(0),
+      _name(),
+      _setThreadName(false)
+{
+    _event = EventWrapper::Create();
+    _critsectStop = CriticalSectionWrapper::CreateCriticalSection();
+    if (threadName != NULL)
+    {
+        // Set the thread name to appear in the VS debugger.
+        _setThreadName = true;
+        strncpy(_name, threadName, kThreadMaxNameLength);
+    }
+}
+
+ThreadWindows::~ThreadWindows()
+{
+#ifdef _DEBUG
+    assert(!_alive);
+#endif
+    if (_thread)
+    {
+        CloseHandle(_thread);
+    }
+    if(_event)
+    {
+        delete _event;
+    }
+    if(_critsectStop)
+    {
+        delete _critsectStop;
+    }
+}
+
+unsigned int WINAPI ThreadWindows::StartThread(LPVOID lpParameter)
+{
+    static_cast<ThreadWindows*>(lpParameter)->Run();
+    return 0;
+}
+
+bool ThreadWindows::Start(unsigned int& threadID)
+{
+    _doNotCloseHandle = false;
+
+    // Set stack size to 1M
+    _thread=(HANDLE)_beginthreadex(NULL, 1024*1024, StartThread, (void*)this, 0,
+                                   &threadID);
+    if(_thread == NULL)
+    {
+        return false;
+    }
+    _id = threadID;
+    _event->Wait(INFINITE);
+
+    switch(_prio)
+    {
+    case kLowPriority:
+        SetThreadPriority(_thread, THREAD_PRIORITY_BELOW_NORMAL);
+        break;
+    case kNormalPriority:
+        SetThreadPriority(_thread, THREAD_PRIORITY_NORMAL);
+        break;
+    case kHighPriority:
+        SetThreadPriority(_thread, THREAD_PRIORITY_ABOVE_NORMAL);
+        break;
+    case kHighestPriority:
+        SetThreadPriority(_thread, THREAD_PRIORITY_HIGHEST);
+        break;
+    case kRealtimePriority:
+        SetThreadPriority(_thread, THREAD_PRIORITY_TIME_CRITICAL);
+        break;
+    };
+    return true;
+}
+
+bool ThreadWindows::SetAffinity(const int* processorNumbers,
+                                const unsigned int amountOfProcessors)
+{
+    DWORD_PTR processorBitMask = 0;
+    for(unsigned int processorIndex = 0;
+        processorIndex < amountOfProcessors;
+        processorIndex++)
+    {
+        // Convert from an array with processor numbers to a bitmask
+        // Processor numbers start at zero.
+        // TODO (hellner): this looks like a bug. Shouldn't the '=' be a '+='?
+        // Or even better |=
+        processorBitMask = 1 << processorNumbers[processorIndex];
+    }
+    return SetThreadAffinityMask(_thread,processorBitMask) != 0;
+}
+
+void ThreadWindows::SetNotAlive()
+{
+    _alive = false;
+}
+
+bool ThreadWindows::Shutdown()
+{
+    DWORD exitCode = 0;
+    BOOL ret = TRUE;
+    if (_thread)
+    {
+        ret = TerminateThread(_thread, exitCode);
+        _alive = false;
+        _dead = true;
+        _thread = NULL;
+    }
+    return ret == TRUE;
+}
+
+bool ThreadWindows::Stop()
+{
+    _critsectStop->Enter();
+    // Prevents the handle from being closed in ThreadWindows::Run()
+    _doNotCloseHandle = true;
+    _alive = false;
+    bool signaled = false;
+    if (_thread && !_dead)
+    {
+        _critsectStop->Leave();
+        // Wait up to 2 seconds for the thread to complete.
+        if( WAIT_OBJECT_0 == WaitForSingleObject(_thread, 2000))
+        {
+            signaled = true;
+        }
+        _critsectStop->Enter();
+    }
+    if (_thread)
+    {
+        CloseHandle(_thread);
+        _thread = NULL;
+    }
+    _critsectStop->Leave();
+
+    if (_dead || signaled)
+    {
+        return true;
+    }
+    else
+    {
+        return false;
+    }
+}
+
+void ThreadWindows::Run()
+{
+    _alive = true;
+    _dead = false;
+    _event->Set();
+
+    // All tracing must be after _event->Set to avoid deadlock in Trace.
+    if (_setThreadName)
+    {
+        WEBRTC_TRACE(kTraceStateInfo, kTraceUtility, _id,
+                     "Thread with name:%s started ", _name);
+        SetThreadName(-1, _name); // -1, set thread name for the calling thread.
+    }else
+    {
+        WEBRTC_TRACE(kTraceStateInfo, kTraceUtility, _id,
+                     "Thread without name started");
+    }
+
+    do
+    {
+        if (_runFunction)
+        {
+            if (!_runFunction(_obj))
+            {
+                _alive = false;
+            }
+        } else {
+            _alive = false;
+        }
+    } while(_alive);
+
+    if (_setThreadName)
+    {
+        WEBRTC_TRACE(kTraceStateInfo, kTraceUtility, _id,
+                     "Thread with name:%s stopped", _name);
+    } else {
+        WEBRTC_TRACE(kTraceStateInfo, kTraceUtility,_id,
+                     "Thread without name stopped");
+    }
+
+    _critsectStop->Enter();
+
+    if (_thread && !_doNotCloseHandle)
+    {
+        HANDLE thread = _thread;
+        _thread = NULL;
+        CloseHandle(thread);
+    }
+    _dead = true;
+
+    _critsectStop->Leave();
+};
+} // namespace webrtc

system_wrappers/source/thread_windows.h

@@ -0,0 +1,66 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_SYSTEM_WRAPPERS_SOURCE_THREAD_WINDOWS_H_
+#define WEBRTC_SYSTEM_WRAPPERS_SOURCE_THREAD_WINDOWS_H_
+
+#include "thread_wrapper.h"
+#include "event_wrapper.h"
+#include "critical_section_wrapper.h"
+
+#include <windows.h>
+
+namespace webrtc {
+
+class ThreadWindows : public ThreadWrapper
+{
+public:
+    ThreadWindows(ThreadRunFunction func, ThreadObj obj, ThreadPriority prio,
+                  const char* threadName);
+    virtual ~ThreadWindows();
+
+    virtual bool Start(unsigned int& id);
+    bool SetAffinity(const int* processorNumbers,
+                     const unsigned int amountOfProcessors);
+    virtual bool Stop();
+    virtual void SetNotAlive();
+
+    static unsigned int WINAPI StartThread(LPVOID lpParameter);
+
+    virtual bool Shutdown();
+
+protected:
+    virtual void Run();
+
+private:
+    ThreadRunFunction    _runFunction;
+    ThreadObj            _obj;
+
+    bool                    _alive;
+    bool                    _dead;
+
+    // TODO (hellner)
+    // _doNotCloseHandle member seem pretty redundant. Should be able to remove
+    // it. Basically it should be fine to reclaim the handle when calling stop
+    // and in the destructor.
+    bool                    _doNotCloseHandle;
+    ThreadPriority          _prio;
+    EventWrapper*           _event;
+    CriticalSectionWrapper* _critsectStop;
+
+    HANDLE                  _thread;
+    unsigned int            _id;
+    char                    _name[kThreadMaxNameLength];
+    bool                    _setThreadName;
+
+};
+} // namespace webrtc
+
+#endif // WEBRTC_SYSTEM_WRAPPERS_SOURCE_THREAD_WINDOWS_H_

system_wrappers/source/thread_windows_set_name.h

@@ -0,0 +1,43 @@
+/*
+ *  Use of this source code is governed by the MICROSOFT LIMITED PUBLIC LICENSE
+ *  copyright license which can be found in the LICENSE file in the
+ *  third_party_mods/mslpl directory of the source tree or at
+ *  http://msdn.microsoft.com/en-us/cc300389.aspx#P.
+ */
+/*
+ *  The original code can be found here:
+ *  http://msdn.microsoft.com/en-us/library/xcb2z8hs(VS.71).aspx
+ */
+
+#ifndef WEBRTC_SYSTEM_WRAPPERS_SOURCE_THREAD_WINDOWS_SET_NAME_H_
+#define WEBRTC_SYSTEM_WRAPPERS_SOURCE_THREAD_WINDOWS_SET_NAME_H_
+
+namespace webrtc {
+
+struct THREADNAME_INFO
+{
+   DWORD dwType;     // must be 0x1000
+   LPCSTR szName;    // pointer to name (in user addr space)
+   DWORD dwThreadID; // thread ID (-1 = caller thread)
+   DWORD dwFlags;    // reserved for future use, must be zero
+};
+
+void SetThreadName(DWORD dwThreadID, LPCSTR szThreadName)
+{
+    THREADNAME_INFO info;
+    info.dwType = 0x1000;
+    info.szName = szThreadName;
+    info.dwThreadID = dwThreadID;
+    info.dwFlags = 0;
+
+    __try
+    {
+        RaiseException(0x406D1388, 0, sizeof(info) / sizeof(DWORD),
+                       (ULONG_PTR*)&info);
+    }
+    __except (EXCEPTION_CONTINUE_EXECUTION)
+    {
+    }
+}
+} // namespace webrtc
+#endif // WEBRTC_SYSTEM_WRAPPERS_SOURCE_THREAD_WINDOWS_SET_NAME_H_

system_wrappers/source/trace_impl.cc

@@ -0,0 +1,949 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "trace_impl.h"
+
+#include <cassert>
+#include <string.h> // memset
+
+#ifdef _WIN32
+#include "trace_windows.h"
+#include "fix_interlocked_exchange_pointer_windows.h"
+#else
+#include <stdio.h>
+#include <time.h>
+#include <stdarg.h>
+#include "trace_linux.h"
+#endif // _WIN32
+
+#define KEY_LEN_CHARS 31
+
+#ifdef _WIN32
+    #pragma warning(disable:4355)
+// VS 2005: Disable warnings for default initialized arrays.
+    #pragma warning(disable:4351)
+#endif // _WIN32
+
+namespace webrtc {
+static WebRtc_UWord32 levelFilter = kTraceDefault;
+
+// Construct On First Use idiom. Avoids "static initialization order fiasco".
+Trace* TraceImpl::StaticInstance(TraceCount inc, const TraceLevel level)
+{
+    // TODO (hellner): use atomic wrapper instead.
+    static volatile long theTraceCount = 0;
+    static Trace* volatile theTrace = NULL;
+
+    TraceCreate state = WEBRTC_TRACE_EXIST;
+
+    // Sanitys to avoid taking lock unless absolutely necessary (for
+    // performance reasons). inc == WEBRTC_TRACE_INC_NO_CREATE) implies that
+    // a message will be written to file.
+    if(level != kTraceAll && inc == WEBRTC_TRACE_INC_NO_CREATE)
+    {
+        if(!(level & levelFilter))
+        {
+            return NULL;
+        }
+    }
+
+#ifndef _WIN32
+    // TODO (pwestin): crtiSect is never reclaimed. Fix memory leak.
+    static CriticalSectionWrapper* crtiSect(
+        CriticalSectionWrapper::CreateCriticalSection());
+    CriticalSectionScoped lock(*crtiSect);
+
+    if(inc == WEBRTC_TRACE_INC_NO_CREATE && theTraceCount == 0)
+    {
+        return NULL;
+    }
+
+    if(inc == WEBRTC_TRACE_INC || inc == WEBRTC_TRACE_INC_NO_CREATE)
+    {
+        theTraceCount++;
+        if(theTraceCount == 1)
+        {
+            state = WEBRTC_TRACE_CREATE;
+        }
+    } else {
+        theTraceCount--;
+        if(theTraceCount == 0)
+        {
+            state = WEBRTC_TRACE_DESTROY;
+        }
+    }
+    if(state == WEBRTC_TRACE_CREATE)
+    {
+        theTrace = TraceImpl::CreateTrace();
+
+    } else if(state == WEBRTC_TRACE_DESTROY) {
+        Trace* oldValue = theTrace;
+        theTrace = NULL;
+        // The lock is held by the scoped critical section. Release the lock
+        // temporarily so that the trace can be safely deleted. If the lock
+        // was kept during the delete, e.g. creating and destroying the trace
+        // too quickly may lead to a deadlock.
+        // This is due to the fact that starting and stopping a ThreadWrapper
+        // thread will trigger writing of trace messages.
+        // TODO (hellner): remove the tight coupling with the thread
+        //                 implementation.
+        crtiSect->Leave();
+        if(oldValue)
+        {
+            delete static_cast<TraceImpl*>(oldValue);
+        }
+        // Re-aqcuire the lock.
+        crtiSect->Enter();
+        return NULL;
+    }
+#else  // _WIN32
+    if(inc == WEBRTC_TRACE_INC_NO_CREATE && theTraceCount == 0)
+    {
+        return NULL;
+    }
+    if(inc == WEBRTC_TRACE_INC_NO_CREATE)
+    {
+        if(1 == InterlockedIncrement(&theTraceCount))
+        {
+            // The trace has been destroyed by some other thread. Rollback.
+            InterlockedDecrement(&theTraceCount);
+            assert(false);
+            return NULL;
+        }
+        // Sanity to catch corrupt state.
+        if(theTrace == NULL)
+        {
+            assert(false);
+            InterlockedDecrement(&theTraceCount);
+            return NULL;
+        }
+    } else if(inc == WEBRTC_TRACE_INC) {
+        if(theTraceCount == 0)
+        {
+            state = WEBRTC_TRACE_CREATE;
+        } else {
+            if(1 == InterlockedIncrement(&theTraceCount))
+            {
+                // InterlockedDecrement because reference count should not be
+                // updated just yet (that's done when the trace is created).
+                InterlockedDecrement(&theTraceCount);
+                state = WEBRTC_TRACE_CREATE;
+            }
+        }
+    } else {
+        int newValue = InterlockedDecrement(&theTraceCount);
+        if(newValue == 0)
+        {
+            state = WEBRTC_TRACE_DESTROY;
+        }
+    }
+
+    if(state == WEBRTC_TRACE_CREATE)
+    {
+        // Create trace and let whichever thread finishes first assign its local
+        // copy to the global instance. All other threads reclaim their local
+        // copy.
+        Trace* newTrace = TraceImpl::CreateTrace();
+        if(1 == InterlockedIncrement(&theTraceCount))
+        {
+            Trace* oldValue = (Trace*)InterlockedExchangePointer(
+                reinterpret_cast<void* volatile*>(&theTrace), newTrace);
+            assert(oldValue == NULL);
+            assert(theTrace);
+        } else {
+            InterlockedDecrement(&theTraceCount);
+            if(newTrace)
+            {
+                delete static_cast<TraceImpl*>(newTrace);
+            }
+        }
+        return NULL;
+    } else if(state == WEBRTC_TRACE_DESTROY)
+    {
+        Trace* oldValue = (Trace*)InterlockedExchangePointer(
+            reinterpret_cast<void* volatile*>(&theTrace), NULL);
+        if(oldValue)
+        {
+            delete static_cast<TraceImpl*>(oldValue);
+        }
+        return NULL;
+    }
+#endif // #ifndef _WIN32
+    return theTrace;
+}
+
+void Trace::CreateTrace()
+{
+    TraceImpl::StaticInstance(WEBRTC_TRACE_INC);
+}
+
+void Trace::ReturnTrace()
+{
+    TraceImpl::StaticInstance(WEBRTC_TRACE_DEC);
+}
+
+TraceImpl* TraceImpl::GetTrace(const TraceLevel level)
+{
+    return (TraceImpl*)StaticInstance(WEBRTC_TRACE_INC_NO_CREATE, level);
+}
+
+Trace* TraceImpl::CreateTrace()
+{
+#if defined(_WIN32)
+    return new TraceWindows();
+#else
+    return new TraceLinux();
+#endif
+}
+
+TraceImpl::TraceImpl()
+    : _critsectInterface(*CriticalSectionWrapper::CreateCriticalSection()),
+      _callback(NULL),
+      _rowCountText(0),
+      _fileCountText(0),
+      _traceFile(*FileWrapper::Create()),
+      _thread(*ThreadWrapper::CreateThread(TraceImpl::Run, this,
+                                           kHighestPriority, "Trace")),
+      _event(*EventWrapper::Create()),
+      _critsectArray(*CriticalSectionWrapper::CreateCriticalSection()),
+      _nextFreeIdx(),
+      _level(),
+      _length(),
+      _messageQueue(),
+      _activeQueue(0)
+{
+    _nextFreeIdx[0] = 0;
+    _nextFreeIdx[1] = 0;
+
+    unsigned int tid = 0;
+    _thread.Start(tid);
+
+    for(int m = 0; m < WEBRTC_TRACE_NUM_ARRAY; m++)
+    {
+        for(int n = 0; n < WEBRTC_TRACE_MAX_QUEUE; n++)
+        {
+            _messageQueue[m][n] = new
+                WebRtc_Word8[WEBRTC_TRACE_MAX_MESSAGE_SIZE];
+        }
+    }
+}
+
+bool TraceImpl::StopThread()
+{
+    // Release the worker thread so that it can flush any lingering messages.
+    _event.Set();
+
+    // Allow 10 ms for pending messages to be flushed out.
+    // TODO (hellner): why not use condition variables to do this? Or let the
+    //                 worker thread die and let this thread flush remaining
+    //                 messages?
+#ifdef _WIN32
+    Sleep(10);
+#else
+    timespec t;
+    t.tv_sec = 0;
+    t.tv_nsec = 10*1000000;
+    nanosleep(&t,NULL);
+#endif
+
+    _thread.SetNotAlive();
+    // Make sure the thread finishes as quickly as possible (instead of having
+    // to wait for the timeout).
+    _event.Set();
+    bool stopped = _thread.Stop();
+
+    CriticalSectionScoped lock(_critsectInterface);
+    _traceFile.Flush();
+    _traceFile.CloseFile();
+    return stopped;
+}
+
+TraceImpl::~TraceImpl()
+{
+    StopThread();
+    delete &_event;
+    delete &_traceFile;
+    delete &_thread;
+    delete &_critsectInterface;
+    delete &_critsectArray;
+
+    for(int m = 0; m < WEBRTC_TRACE_NUM_ARRAY; m++)
+    {
+        for(int n = 0; n < WEBRTC_TRACE_MAX_QUEUE; n++)
+        {
+            delete [] _messageQueue[m][n];
+        }
+    }
+}
+
+WebRtc_Word32 TraceImpl::AddLevel(char* szMessage, const TraceLevel level) const
+{
+    switch (level)
+    {
+        case kTraceStateInfo:
+            sprintf (szMessage, "STATEINFO ; ");
+            break;
+        case kTraceWarning:
+            sprintf (szMessage, "WARNING   ; ");
+            break;
+        case kTraceError:
+            sprintf (szMessage, "ERROR     ; ");
+            break;
+        case kTraceCritical:
+            sprintf (szMessage, "CRITICAL  ; ");
+            break;
+        case kTraceInfo:
+            sprintf (szMessage, "DEBUGINFO ; ");
+            break;
+        case kTraceModuleCall:
+            sprintf (szMessage, "MODULECALL; ");
+            break;
+        case kTraceMemory:
+            sprintf (szMessage, "MEMORY    ; ");
+            break;
+        case kTraceTimer:
+            sprintf (szMessage, "TIMER     ; ");
+            break;
+        case kTraceStream:
+            sprintf (szMessage, "STREAM    ; ");
+            break;
+        case kTraceApiCall:
+            sprintf (szMessage, "APICALL   ; ");
+            break;
+        case kTraceDebug:
+            sprintf (szMessage, "DEBUG     ; ");
+            break;
+        default:
+            assert(false);
+            return 0;
+    }
+    // All messages are 12 characters.
+    return 12;
+}
+
+WebRtc_Word32 TraceImpl::AddModuleAndId(char* traceMessage,
+                                        const TraceModule module,
+                                        const WebRtc_Word32 id) const
+{
+    // Use long int to prevent problems with different definitions of
+    // WebRtc_Word32.
+    // TODO (hellner): is this actually a problem? If so, it should be better to
+    //                 clean up WebRtc_Word32
+    const long int idl = id;
+    if(idl != -1)
+    {
+        const unsigned long int idEngine = id>>16;
+        const unsigned long int idChannel = id & 0xffff;
+
+        switch (module)
+        {
+            case kTraceVoice:
+                sprintf(traceMessage, "       VOICE:%5ld %5ld;", idEngine,
+                        idChannel);
+                break;
+            case kTraceVideo:
+                sprintf(traceMessage, "       VIDEO:%5ld %5ld;", idEngine,
+                        idChannel);
+                break;
+            case kTraceUtility:
+                sprintf(traceMessage, "     UTILITY:%5ld %5ld;", idEngine,
+                        idChannel);
+                break;
+            case kTraceRtpRtcp:
+                sprintf(traceMessage, "    RTP/RTCP:%5ld %5ld;", idEngine,
+                        idChannel);
+                break;
+            case kTraceTransport:
+                sprintf(traceMessage, "   TRANSPORT:%5ld %5ld;", idEngine,
+                        idChannel);
+                break;
+            case kTraceAudioCoding:
+                sprintf(traceMessage, "AUDIO CODING:%5ld %5ld;", idEngine,
+                        idChannel);
+                break;
+            case kTraceSrtp:
+                sprintf(traceMessage, "        SRTP:%5ld %5ld;", idEngine,
+                        idChannel);
+                break;
+            case kTraceAudioMixerServer:
+                sprintf(traceMessage, " AUDIO MIX/S:%5ld %5ld;", idEngine,
+                        idChannel);
+                break;
+            case kTraceAudioMixerClient:
+                sprintf(traceMessage, " AUDIO MIX/C:%5ld %5ld;", idEngine,
+                        idChannel);
+                break;
+            case kTraceVideoCoding:
+                sprintf(traceMessage, "VIDEO CODING:%5ld %5ld;", idEngine,
+                        idChannel);
+                break;
+            case kTraceVideoMixer:
+                // Print sleep time and API call
+                sprintf(traceMessage, "   VIDEO MIX:%5ld %5ld;", idEngine,
+                        idChannel);
+                break;
+            case kTraceFile:
+                sprintf(traceMessage, "        FILE:%5ld %5ld;", idEngine,
+                        idChannel);
+                break;
+            case kTraceVqe:
+                sprintf(traceMessage, "         VQE:%5ld %5ld;", idEngine,
+                        idChannel);
+                break;
+            case kTraceAudioDevice:
+                sprintf(traceMessage, "AUDIO DEVICE:%5ld %5ld;", idEngine,
+                        idChannel);
+                break;
+            case kTraceVideoRenderer:
+                sprintf(traceMessage, "VIDEO RENDER:%5ld %5ld;", idEngine,
+                        idChannel);
+                break;
+            case kTraceVideoCapture:
+                sprintf(traceMessage, "VIDEO CAPTUR:%5ld %5ld;", idEngine,
+                        idChannel);
+                break;
+            case kTraceVideoPreocessing:
+                sprintf(traceMessage, "  VIDEO PROC:%5ld %5ld;", idEngine,
+                        idChannel);
+                break;
+            default:
+                assert(false);
+                return 0;
+        }
+    } else {
+        switch (module)
+        {
+            case kTraceVoice:
+                sprintf (traceMessage, "       VOICE:%11ld;", idl);
+                break;
+            case kTraceVideo:
+                sprintf (traceMessage, "       VIDEO:%11ld;", idl);
+                break;
+            case kTraceUtility:
+                sprintf (traceMessage, "     UTILITY:%11ld;", idl);
+                break;
+            case kTraceRtpRtcp:
+                sprintf (traceMessage, "    RTP/RTCP:%11ld;", idl);
+                break;
+            case kTraceTransport:
+                sprintf (traceMessage, "   TRANSPORT:%11ld;", idl);
+                break;
+            case kTraceAudioCoding:
+                sprintf (traceMessage, "AUDIO CODING:%11ld;", idl);
+                break;
+            case kTraceSrtp:
+                sprintf (traceMessage, "        SRTP:%11ld;", idl);
+                break;
+            case kTraceAudioMixerServer:
+                sprintf (traceMessage, " AUDIO MIX/S:%11ld;", idl);
+                break;
+            case kTraceAudioMixerClient:
+                sprintf (traceMessage, " AUDIO MIX/C:%11ld;", idl);
+                break;
+            case kTraceVideoCoding:
+                sprintf (traceMessage, "VIDEO CODING:%11ld;", idl);
+                break;
+            case kTraceVideoMixer:
+                sprintf (traceMessage, "   VIDEO MIX:%11ld;", idl);
+                break;
+            case kTraceFile:
+                sprintf (traceMessage, "        FILE:%11ld;", idl);
+                break;
+            case kTraceVqe:
+                sprintf (traceMessage, "         VQE:%11ld;", idl);
+                break;
+            case kTraceAudioDevice:
+                sprintf (traceMessage, "AUDIO DEVICE:%11ld;", idl);
+                break;
+            case kTraceVideoRenderer:
+                sprintf (traceMessage, "VIDEO RENDER:%11ld;", idl);
+                break;
+            case kTraceVideoCapture:
+                sprintf (traceMessage, "VIDEO CAPTUR:%11ld;", idl);
+                break;
+            case kTraceVideoPreocessing:
+                sprintf (traceMessage, "  VIDEO PROC:%11ld;", idl);
+                break;
+            default:
+                assert(false);
+                return 0;
+        }
+    }
+    // All messages are 25 characters.
+    return 25;
+}
+
+WebRtc_Word32 TraceImpl::SetTraceFileImpl(const WebRtc_Word8* fileNameUTF8,
+                                          const bool addFileCounter)
+{
+    CriticalSectionScoped lock(_critsectInterface);
+
+    _traceFile.Flush();
+    _traceFile.CloseFile();
+
+    if(fileNameUTF8)
+    {
+        if(addFileCounter)
+        {
+            _fileCountText = 1;
+
+            WebRtc_Word8 fileNameWithCounterUTF8[FileWrapper::kMaxFileNameSize];
+            CreateFileName(fileNameUTF8, fileNameWithCounterUTF8,
+                           _fileCountText);
+            if(_traceFile.OpenFile(fileNameWithCounterUTF8, false, false,
+                                   true) == -1)
+            {
+                return -1;
+            }
+        }else {
+            _fileCountText = 0;
+            if(_traceFile.OpenFile(fileNameUTF8, false, false, true) == -1)
+            {
+                return -1;
+            }
+        }
+    }
+    _rowCountText = 0;
+    return 0;
+}
+
+WebRtc_Word32 TraceImpl::TraceFileImpl(
+    WebRtc_Word8 fileNameUTF8[FileWrapper::kMaxFileNameSize])
+{
+    CriticalSectionScoped lock(_critsectInterface);
+    return _traceFile.FileName(fileNameUTF8, FileWrapper::kMaxFileNameSize);
+}
+
+WebRtc_Word32 TraceImpl::SetTraceCallbackImpl(TraceCallback* callback)
+{
+    CriticalSectionScoped lock(_critsectInterface);
+    _callback = callback;
+    return 0;
+}
+
+WebRtc_Word32 TraceImpl::AddMessage(
+    char* traceMessage,
+    const char msg[WEBRTC_TRACE_MAX_MESSAGE_SIZE],
+    const WebRtc_UWord16 writtenSoFar) const
+
+{
+    int length = 0;
+    if(writtenSoFar >= WEBRTC_TRACE_MAX_MESSAGE_SIZE)
+    {
+        return -1;
+    }
+    // - 2 to leave room for newline and NULL termination
+#ifdef _WIN32
+    length = _snprintf(traceMessage,
+                       WEBRTC_TRACE_MAX_MESSAGE_SIZE - writtenSoFar - 2,
+                       "%s",msg);
+    if(length < 0)
+    {
+        length = WEBRTC_TRACE_MAX_MESSAGE_SIZE - writtenSoFar - 2;
+        traceMessage[length] = 0;
+    }
+#else
+    length = snprintf(traceMessage,
+                      WEBRTC_TRACE_MAX_MESSAGE_SIZE-writtenSoFar-2, "%s",msg);
+    if(length < 0 || length > WEBRTC_TRACE_MAX_MESSAGE_SIZE-writtenSoFar - 2)
+    {
+        length = WEBRTC_TRACE_MAX_MESSAGE_SIZE - writtenSoFar - 2;
+        traceMessage[length] = 0;
+    }
+#endif
+    // Length with NULL termination.
+    return length+1;
+}
+
+void TraceImpl::AddMessageToList(
+    const char traceMessage[WEBRTC_TRACE_MAX_MESSAGE_SIZE],
+    const WebRtc_UWord16 length,
+    const TraceLevel level)
+{
+    CriticalSectionScoped lock(_critsectArray);
+
+    if(_nextFreeIdx[_activeQueue] >= WEBRTC_TRACE_MAX_QUEUE)
+    {
+        if( ! _traceFile.Open() &&
+            !_callback)
+        {
+            // Keep at least the last 1/4 of old messages when not logging.
+            // TODO (hellner): isn't this redundant. The user will make it known
+            //                 when to start logging. Why keep messages before
+            //                 that?
+            for(int n = 0; n < WEBRTC_TRACE_MAX_QUEUE/4; n++)
+            {
+                const int lastQuarterOffset = (3*WEBRTC_TRACE_MAX_QUEUE/4);
+                memcpy(_messageQueue[_activeQueue][n],
+                       _messageQueue[_activeQueue][n + lastQuarterOffset],
+                       WEBRTC_TRACE_MAX_MESSAGE_SIZE);
+            }
+            _nextFreeIdx[_activeQueue] = WEBRTC_TRACE_MAX_QUEUE/4;
+        } else {
+            // More messages are being written than there is room for in the
+            // buffer. Drop any new messages.
+            // TODO (hellner): its probably better to drop old messages instead
+            //                 of new ones. One step further: if this happens
+            //                 it's due to writing faster than what can be
+            //                 processed. Maybe modify the filter at this point.
+            //                 E.g. turn of STREAM.
+            return;
+        }
+    }
+
+    WebRtc_UWord16 idx = _nextFreeIdx[_activeQueue];
+    _nextFreeIdx[_activeQueue]++;
+
+    _level[_activeQueue][idx] = level;
+    _length[_activeQueue][idx] = length;
+    memcpy(_messageQueue[_activeQueue][idx], traceMessage, length);
+
+    if(_nextFreeIdx[_activeQueue] == WEBRTC_TRACE_MAX_QUEUE-1)
+    {
+        // Loggin more messages than can be worked off. Log a warning.
+        memcpy(_messageQueue[_activeQueue][_nextFreeIdx[_activeQueue]],
+               "WARNING MISSING TRACE MESSAGES\n", 32);
+        _nextFreeIdx[_activeQueue]++;
+    }
+}
+
+bool TraceImpl::Run(void* obj)
+{
+    return static_cast<TraceImpl*>(obj)->Process();
+}
+
+bool TraceImpl::Process()
+{
+    if(_event.Wait(1000) == kEventSignaled)
+    {
+        if(_traceFile.Open() || _callback)
+        {
+            // File mode (not calback mode).
+            WriteToFile();
+        }
+    } else {
+        _traceFile.Flush();
+    }
+    return true;
+}
+
+void TraceImpl::WriteToFile()
+{
+    WebRtc_UWord8 localQueueActive = 0;
+    WebRtc_UWord16 localNextFreeIdx = 0;
+
+    // There are two buffer. One for reading (for writing to file) and one for
+    // writing (for storing new messages). Let new messages be posted to the
+    // unused buffer so that the current buffer can be flushed safely.
+    {
+        CriticalSectionScoped lock(_critsectArray);
+        localNextFreeIdx = _nextFreeIdx[_activeQueue];
+        _nextFreeIdx[_activeQueue] = 0;
+        localQueueActive = _activeQueue;
+        if(_activeQueue == 0)
+        {
+            _activeQueue = 1;
+        } else
+        {
+            _activeQueue = 0;
+        }
+    }
+    if(localNextFreeIdx == 0)
+    {
+        return;
+    }
+
+    CriticalSectionScoped lock(_critsectInterface);
+
+    for(WebRtc_UWord16 idx = 0; idx <localNextFreeIdx; idx++)
+    {
+        TraceLevel localLevel = _level[localQueueActive][idx];
+        if(_callback)
+        {
+            _callback->Print(localLevel, _messageQueue[localQueueActive][idx],
+                             _length[localQueueActive][idx]);
+        }
+        if(_traceFile.Open())
+        {
+            if(_rowCountText > WEBRTC_TRACE_MAX_FILE_SIZE)
+            {
+                // wrap file
+                _rowCountText = 0;
+                _traceFile.Flush();
+
+                if(_fileCountText == 0)
+                {
+                    _traceFile.Rewind();
+                } else
+                {
+                    WebRtc_Word8 oldFileName[FileWrapper::kMaxFileNameSize];
+                    WebRtc_Word8 newFileName[FileWrapper::kMaxFileNameSize];
+
+                    // get current name
+                    _traceFile.FileName(oldFileName,
+                                        FileWrapper::kMaxFileNameSize);
+                    _traceFile.CloseFile();
+
+                    _fileCountText++;
+
+                    UpdateFileName(oldFileName, newFileName, _fileCountText);
+
+                    if(_traceFile.OpenFile(newFileName, false, false,
+                                           true) == -1)
+                    {
+                        return;
+                    }
+                }
+            }
+            if(_rowCountText ==  0)
+            {
+                WebRtc_Word8 message[WEBRTC_TRACE_MAX_MESSAGE_SIZE + 1];
+                WebRtc_Word32 length = AddDateTimeInfo(message);
+                if(length != -1)
+                {
+                    message[length] = 0;
+                    message[length-1] = '\n';
+                    _traceFile.Write(message, length);
+                    _rowCountText++;
+                }
+                length = AddBuildInfo(message);
+                if(length != -1)
+                {
+                    message[length+1] = 0;
+                    message[length] = '\n';
+                    message[length-1] = '\n';
+                    _traceFile.Write(message, length+1);
+                    _rowCountText++;
+                    _rowCountText++;
+                }
+            }
+            WebRtc_UWord16 length = _length[localQueueActive][idx];
+            _messageQueue[localQueueActive][idx][length] = 0;
+            _messageQueue[localQueueActive][idx][length-1] = '\n';
+            _traceFile.Write(_messageQueue[localQueueActive][idx], length);
+            _rowCountText++;
+        }
+    }
+}
+
+void TraceImpl::AddImpl(const TraceLevel level, const TraceModule module,
+                        const WebRtc_Word32 id,
+                        const char msg[WEBRTC_TRACE_MAX_MESSAGE_SIZE])
+{
+    if (TraceCheck(level))
+    {
+        char traceMessage[WEBRTC_TRACE_MAX_MESSAGE_SIZE];
+        char* meassagePtr = traceMessage;
+
+        WebRtc_Word32 len = 0;
+        WebRtc_Word32 ackLen = 0;
+
+        len = AddLevel(meassagePtr, level);
+        if(len == -1)
+        {
+            return;
+        }
+        meassagePtr += len;
+        ackLen += len;
+
+        len = AddTime(meassagePtr, level);
+        if(len == -1)
+        {
+            return;
+        }
+        meassagePtr += len;
+        ackLen += len;
+
+        len = AddModuleAndId(meassagePtr, module, id);
+        if(len == -1)
+        {
+            return;
+        }
+        meassagePtr += len;
+        ackLen += len;
+
+        len = AddThreadId(meassagePtr);
+        if(len == -1)
+        {
+            return;
+        }
+        meassagePtr += len;
+        ackLen += len;
+
+        len = AddMessage(meassagePtr, msg, (WebRtc_UWord16)ackLen);
+        if(len == -1)
+        {
+            return;
+        }
+        ackLen += len;
+        AddMessageToList(traceMessage,(WebRtc_UWord16)ackLen, level);
+
+        // Make sure that messages are written as soon as possible.
+        _event.Set();
+    }
+}
+
+bool TraceImpl::TraceCheck(const TraceLevel level) const
+{
+    return (level & levelFilter)? true:false;
+}
+
+bool TraceImpl::UpdateFileName(
+    const WebRtc_Word8 fileNameUTF8[FileWrapper::kMaxFileNameSize],
+    WebRtc_Word8 fileNameWithCounterUTF8[FileWrapper::kMaxFileNameSize],
+    const WebRtc_UWord32 newCount) const
+{
+    WebRtc_Word32 length = (WebRtc_Word32)strlen(fileNameUTF8);
+    if(length < 0)
+    {
+        return false;
+    }
+
+    WebRtc_Word32 lengthWithoutFileEnding = length-1;
+    while(lengthWithoutFileEnding > 0)
+    {
+        if(fileNameUTF8[lengthWithoutFileEnding] == '.')
+        {
+            break;
+        } else {
+            lengthWithoutFileEnding--;
+        }
+    }
+    if(lengthWithoutFileEnding == 0)
+    {
+        lengthWithoutFileEnding = length;
+    }
+    WebRtc_Word32 lengthTo_ = lengthWithoutFileEnding - 1;
+    while(lengthTo_ > 0)
+    {
+        if(fileNameUTF8[lengthTo_] == '_')
+        {
+            break;
+        } else {
+            lengthTo_--;
+        }
+    }
+
+    memcpy(fileNameWithCounterUTF8, fileNameUTF8, lengthTo_);
+    sprintf(fileNameWithCounterUTF8+lengthTo_, "_%lu%s", newCount,
+            fileNameUTF8+lengthWithoutFileEnding);
+    return true;
+}
+
+bool TraceImpl::CreateFileName(
+    const WebRtc_Word8 fileNameUTF8[FileWrapper::kMaxFileNameSize],
+    WebRtc_Word8 fileNameWithCounterUTF8[FileWrapper::kMaxFileNameSize],
+    const WebRtc_UWord32 newCount) const
+{
+    WebRtc_Word32 length = (WebRtc_Word32)strlen(fileNameUTF8);
+    if(length < 0)
+    {
+        return false;
+    }
+
+    WebRtc_Word32 lengthWithoutFileEnding = length-1;
+    while(lengthWithoutFileEnding > 0)
+    {
+        if(fileNameUTF8[lengthWithoutFileEnding] == '.')
+        {
+            break;
+        }else
+        {
+            lengthWithoutFileEnding--;
+        }
+    }
+    if(lengthWithoutFileEnding == 0)
+    {
+        lengthWithoutFileEnding = length;
+    }
+    memcpy(fileNameWithCounterUTF8, fileNameUTF8, lengthWithoutFileEnding);
+    sprintf(fileNameWithCounterUTF8+lengthWithoutFileEnding, "_%lu%s",
+            newCount, fileNameUTF8+lengthWithoutFileEnding);
+    return true;
+}
+
+WebRtc_Word32 Trace::SetLevelFilter(WebRtc_UWord32 filter)
+{
+    levelFilter = filter;
+    return 0;
+};
+
+WebRtc_Word32 Trace::LevelFilter(WebRtc_UWord32& filter)
+{
+    filter = levelFilter;
+    return 0;
+};
+
+WebRtc_Word32 Trace::TraceFile(WebRtc_Word8 fileName[FileWrapper::kMaxFileNameSize])
+{
+    TraceImpl* trace = TraceImpl::GetTrace();
+    if(trace)
+    {
+        int retVal = trace->TraceFileImpl(fileName);
+        ReturnTrace();
+        return retVal;
+    }
+    return -1;
+}
+
+WebRtc_Word32 Trace::SetTraceFile(const WebRtc_Word8* fileName,
+                                  const bool addFileCounter)
+{
+    TraceImpl* trace = TraceImpl::GetTrace();
+    if(trace)
+    {
+        int retVal = trace->SetTraceFileImpl(fileName, addFileCounter);
+        ReturnTrace();
+        return retVal;
+    }
+    return -1;
+}
+
+WebRtc_Word32 Trace::SetTraceCallback(TraceCallback* callback)
+{
+    TraceImpl* trace = TraceImpl::GetTrace();
+    if(trace)
+    {
+        int retVal = trace->SetTraceCallbackImpl(callback);
+        ReturnTrace();
+        return retVal;
+    }
+    return -1;
+}
+
+void Trace::Add(const TraceLevel level, const TraceModule module,
+                const WebRtc_Word32 id, const char* msg, ...)
+
+{
+    TraceImpl* trace = TraceImpl::GetTrace(level);
+    if(trace)
+    {
+        if(trace->TraceCheck(level))
+        {
+            char tempBuff[WEBRTC_TRACE_MAX_MESSAGE_SIZE];
+            char* buff = 0;
+            if(msg)
+            {
+                va_list args;
+                va_start(args, msg);
+#ifdef _WIN32
+                _vsnprintf(tempBuff,WEBRTC_TRACE_MAX_MESSAGE_SIZE-1,msg,args);
+#else
+                vsnprintf(tempBuff,WEBRTC_TRACE_MAX_MESSAGE_SIZE-1,msg,args);
+#endif
+                va_end(args);
+                buff = tempBuff;
+            }
+            trace->AddImpl(level, module, id, buff);
+        }
+        ReturnTrace();
+    }
+}
+} // namespace webrtc

system_wrappers/source/trace_impl.h

@@ -0,0 +1,141 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_SYSTEM_WRAPPERS_SOURCE_TRACE_IMPL_H_
+#define WEBRTC_SYSTEM_WRAPPERS_SOURCE_TRACE_IMPL_H_
+
+#include "system_wrappers/interface/critical_section_wrapper.h"
+#include "system_wrappers/interface/event_wrapper.h"
+#include "system_wrappers/interface/file_wrapper.h"
+#include "system_wrappers/interface/trace.h"
+#include "system_wrappers/interface/thread_wrapper.h"
+
+namespace webrtc {
+enum TraceCount
+{
+    WEBRTC_TRACE_DEC    = 0,
+    WEBRTC_TRACE_INC    = 1,
+    WEBRTC_TRACE_INC_NO_CREATE = 2
+};
+
+enum TraceCreate
+{
+    WEBRTC_TRACE_EXIST    = 0,
+    WEBRTC_TRACE_CREATE   = 1,
+    WEBRTC_TRACE_DESTROY  = 2
+};
+
+// TODO (pwestin) WEBRTC_TRACE_MAX_QUEUE needs to be tweaked
+// TODO (hellner) the buffer should be close to how much the system can write to
+//                file. Increasing the buffer will not solve anything. Sooner or
+//                later the buffer is going to fill up anyways.
+#if defined(MAC_IPHONE)
+    #define WEBRTC_TRACE_MAX_QUEUE  2000
+#else
+    #define WEBRTC_TRACE_MAX_QUEUE  8000
+#endif
+#define WEBRTC_TRACE_NUM_ARRAY 2
+#define WEBRTC_TRACE_MAX_MESSAGE_SIZE 256
+// Total buffer size is WEBRTC_TRACE_NUM_ARRAY (number of buffer partitions) *
+// WEBRTC_TRACE_MAX_QUEUE (number of lines per buffer partition) *
+// WEBRTC_TRACE_MAX_MESSAGE_SIZE (number of 1 byte charachters per line) =
+// 1 or 4 Mbyte
+
+#define WEBRTC_TRACE_MAX_FILE_SIZE 100*1000
+// Number of rows that may be written to file. On average 110 bytes per row (max
+// 256 bytes per row). So on average 110*100*1000 = 11 Mbyte, max 256*100*1000 =
+// 25.6 Mbyte
+
+class TraceImpl : public Trace
+{
+public:
+    virtual ~TraceImpl();
+
+    static Trace* CreateTrace();
+    static TraceImpl* GetTrace(const TraceLevel level = kTraceAll);
+
+    static Trace* StaticInstance(TraceCount inc,
+                                 const TraceLevel level = kTraceAll);
+
+    WebRtc_Word32 SetTraceFileImpl(const WebRtc_Word8* fileName,
+                                   const bool addFileCounter);
+    WebRtc_Word32 TraceFileImpl(
+        WebRtc_Word8 fileName[FileWrapper::kMaxFileNameSize]);
+
+    WebRtc_Word32 SetTraceCallbackImpl(TraceCallback* callback);
+
+    void AddImpl(const TraceLevel level, const TraceModule module,
+                 const WebRtc_Word32 id, const char* msg);
+
+    bool StopThread();
+
+    bool TraceCheck(const TraceLevel level) const;
+
+protected:
+    TraceImpl();
+
+    // OS specific implementations
+    virtual WebRtc_Word32 AddThreadId(char* traceMessage) const = 0;
+    virtual WebRtc_Word32 AddTime(char* traceMessage,
+                                  const TraceLevel level) const = 0;
+
+    virtual WebRtc_Word32 AddBuildInfo(char* traceMessage) const = 0;
+    virtual WebRtc_Word32 AddDateTimeInfo(char* traceMessage) const = 0;
+
+    static bool Run(void* obj);
+    bool Process();
+
+private:
+    WebRtc_Word32 AddLevel(char* szMessage, const TraceLevel level) const;
+
+    WebRtc_Word32 AddModuleAndId(char* traceMessage, const TraceModule module,
+                                 const WebRtc_Word32 id) const;
+
+    WebRtc_Word32 AddMessage(char* traceMessage,
+                             const char msg[WEBRTC_TRACE_MAX_MESSAGE_SIZE],
+                             const WebRtc_UWord16 writtenSoFar) const;
+
+    void AddMessageToList(
+        const char traceMessage[WEBRTC_TRACE_MAX_MESSAGE_SIZE],
+        const WebRtc_UWord16 length,
+        const TraceLevel level);
+
+    bool UpdateFileName(
+        const WebRtc_Word8 fileNameUTF8[FileWrapper::kMaxFileNameSize],
+        WebRtc_Word8 fileNameWithCounterUTF8[FileWrapper::kMaxFileNameSize],
+        const WebRtc_UWord32 newCount) const;
+
+    bool CreateFileName(
+        const WebRtc_Word8 fileNameUTF8[FileWrapper::kMaxFileNameSize],
+        WebRtc_Word8 fileNameWithCounterUTF8[FileWrapper::kMaxFileNameSize],
+        const WebRtc_UWord32 newCount) const;
+
+    void WriteToFile();
+
+    CriticalSectionWrapper& _critsectInterface;
+    TraceCallback* _callback;
+    WebRtc_UWord32 _rowCountText;
+    WebRtc_UWord32 _fileCountText;
+
+    FileWrapper& _traceFile;
+    ThreadWrapper& _thread;
+    EventWrapper& _event;
+
+    // _critsectArray protects _activeQueue
+    CriticalSectionWrapper& _critsectArray;
+    WebRtc_UWord16 _nextFreeIdx[WEBRTC_TRACE_NUM_ARRAY];
+    TraceLevel _level[WEBRTC_TRACE_NUM_ARRAY][WEBRTC_TRACE_MAX_QUEUE];
+    WebRtc_UWord16 _length[WEBRTC_TRACE_NUM_ARRAY][WEBRTC_TRACE_MAX_QUEUE];
+    WebRtc_Word8* _messageQueue[WEBRTC_TRACE_NUM_ARRAY][WEBRTC_TRACE_MAX_QUEUE];
+    WebRtc_UWord8 _activeQueue;
+};
+} // namespace webrtc
+
+#endif // WEBRTC_SYSTEM_WRAPPERS_SOURCE_TRACE_IMPL_H_

system_wrappers/source/trace_linux.cc

@@ -0,0 +1,133 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "trace_linux.h"
+
+#include <cassert>
+#include <stdarg.h>
+#include <stdio.h>
+#include <string.h>
+#include <time.h>
+
+#ifdef ANDROID
+    #include <pthread.h>
+#else
+    #include <iostream>
+#endif
+
+#if defined(_DEBUG)
+    #define BUILDMODE "d"
+#elif defined(DEBUG)
+    #define BUILDMODE "d"
+#elif defined(NDEBUG)
+    #define BUILDMODE "r"
+#else
+    #define BUILDMODE "?"
+#endif
+#define BUILDTIME __TIME__
+#define BUILDDATE __DATE__
+// example: "Oct 10 2002 12:05:30 r"
+#define BUILDINFO BUILDDATE " " BUILDTIME " " BUILDMODE
+
+namespace webrtc {
+TraceLinux::TraceLinux()
+{
+    _prevAPITickCount = time(NULL);
+    _prevTickCount = _prevAPITickCount;
+}
+
+TraceLinux::~TraceLinux()
+{
+    StopThread();
+}
+
+WebRtc_Word32 TraceLinux::AddThreadId(char* traceMessage) const
+{
+    WebRtc_UWord64 threadId = (WebRtc_UWord64)pthread_self();
+    sprintf(traceMessage, "%10llu; ", threadId);
+    // 12 bytes are written.
+    return 12;
+}
+
+WebRtc_Word32 TraceLinux::AddTime(char* traceMessage,
+                                  const TraceLevel level) const
+{
+    time_t dwCurrentTimeInSeconds = time(NULL);
+    struct tm systemTime;
+    gmtime_r(&dwCurrentTimeInSeconds, &systemTime);
+
+    if(level == kTraceApiCall)
+    {
+        WebRtc_UWord32 dwDeltaTime = dwCurrentTimeInSeconds - _prevTickCount;
+        _prevTickCount = dwCurrentTimeInSeconds;
+
+        if(_prevTickCount == 0)
+        {
+            dwDeltaTime = 0;
+        }
+        if(dwDeltaTime > 0x0fffffff)
+        {
+            // Either wraparound or data race.
+            dwDeltaTime = 0;
+        }
+        if(dwDeltaTime > 99999)
+        {
+            dwDeltaTime = 99999;
+        }
+
+        sprintf (traceMessage, "(%2u:%2u:%2u:%3u |%5lu) ", systemTime.tm_hour,
+                 systemTime.tm_min, systemTime.tm_sec, 0, dwDeltaTime);
+    } else {
+        WebRtc_UWord32 dwDeltaTime = dwCurrentTimeInSeconds - _prevAPITickCount;
+        _prevAPITickCount = dwCurrentTimeInSeconds;
+        if(_prevAPITickCount == 0)
+        {
+            dwDeltaTime = 0;
+        }
+        if(dwDeltaTime > 0x0fffffff)
+        {
+            // Either wraparound or data race.
+            dwDeltaTime = 0;
+        }
+        if(dwDeltaTime > 99999)
+        {
+            dwDeltaTime = 99999;
+        }
+        sprintf (traceMessage, "(%2u:%2u:%2u:%3u |%5lu) ", systemTime.tm_hour,
+                 systemTime.tm_min, systemTime.tm_sec, 0, dwDeltaTime);
+    }
+    // Messages is 22 characters.
+    return 22;
+}
+
+WebRtc_Word32 TraceLinux::AddBuildInfo(char* traceMessage) const
+{
+    sprintf(traceMessage, "Build info: %s", BUILDINFO);
+    // Include NULL termination (hence + 1).
+    return strlen(traceMessage) + 1;
+}
+
+WebRtc_Word32 TraceLinux::AddDateTimeInfo(char* traceMessage) const
+{
+    time_t t;
+    time(&t);
+    sprintf(traceMessage, "Local Date: %s", ctime(&t));
+    WebRtc_Word32 len = static_cast<WebRtc_Word32>(strlen(traceMessage));
+
+    if ('\n' == traceMessage[len - 1])
+    {
+        traceMessage[len - 1] = '\0';
+        --len;
+    }
+
+    // Messages is 12 characters.
+    return len + 1;
+}
+} // namespace webrtc

system_wrappers/source/trace_linux.h

@@ -0,0 +1,37 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_SYSTEM_WRAPPERS_SOURCE_TRACE_LINUX_H_
+#define WEBRTC_SYSTEM_WRAPPERS_SOURCE_TRACE_LINUX_H_
+
+#include "critical_section_wrapper.h"
+#include "trace_impl.h"
+
+namespace webrtc {
+class TraceLinux : public TraceImpl
+{
+public:
+    TraceLinux();
+    virtual ~TraceLinux();
+
+    virtual WebRtc_Word32 AddThreadId(char *traceMessage) const;
+    virtual WebRtc_Word32 AddTime(char* traceMessage,
+                                  const TraceLevel level) const;
+
+    virtual WebRtc_Word32 AddBuildInfo(char* traceMessage) const;
+    virtual WebRtc_Word32 AddDateTimeInfo(char* traceMessage) const;
+
+private:
+    volatile mutable WebRtc_UWord32  _prevAPITickCount;
+    volatile mutable WebRtc_UWord32  _prevTickCount;
+};
+} // namespace webrtc
+
+#endif // WEBRTC_SYSTEM_WRAPPERS_SOURCE_TRACE_LINUX_H_

system_wrappers/source/trace_windows.cc

@@ -0,0 +1,141 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "trace_windows.h"
+
+#include <cassert>
+#include <stdarg.h>
+
+#include "Mmsystem.h"
+
+#if defined(_DEBUG)
+    #define BUILDMODE "d"
+#elif defined(DEBUG)
+    #define BUILDMODE "d"
+#elif defined(NDEBUG)
+    #define BUILDMODE "r"
+#else
+    #define BUILDMODE "?"
+#endif
+#define BUILDTIME __TIME__
+#define BUILDDATE __DATE__
+// Example: "Oct 10 2002 12:05:30 r"
+#define BUILDINFO BUILDDATE " " BUILDTIME " " BUILDMODE
+
+namespace webrtc {
+TraceWindows::TraceWindows()
+    : _prevAPITickCount(0),
+      _prevTickCount(0)
+{
+}
+
+TraceWindows::~TraceWindows()
+{
+    StopThread();
+}
+
+WebRtc_Word32 TraceWindows::AddThreadId(char* traceMessage) const
+{
+    WebRtc_UWord32 threadId= GetCurrentThreadId();
+    sprintf (traceMessage, "%10u; ", threadId);
+    // Messages is 12 characters.
+    return 12;
+}
+
+WebRtc_Word32 TraceWindows::AddTime(char* traceMessage,
+                                    const TraceLevel level) const
+{
+    WebRtc_UWord32 dwCurrentTime = timeGetTime();
+    SYSTEMTIME systemTime;
+    GetSystemTime(&systemTime);
+
+    if(level == kTraceApiCall)
+    {
+        WebRtc_UWord32 dwDeltaTime = dwCurrentTime- _prevTickCount;
+        _prevTickCount = dwCurrentTime;
+
+        if(_prevTickCount == 0)
+        {
+            dwDeltaTime = 0;
+        }
+        if(dwDeltaTime > 0x0fffffff)
+        {
+            // Either wraparound or data race.
+            dwDeltaTime = 0;
+        }
+        if(dwDeltaTime > 99999)
+        {
+            dwDeltaTime = 99999;
+        }
+
+        sprintf (traceMessage, "(%2u:%2u:%2u:%3u |%5lu) ", systemTime.wHour,
+                 systemTime.wMinute, systemTime.wSecond,
+                 systemTime.wMilliseconds, dwDeltaTime);
+    } else {
+        WebRtc_UWord32 dwDeltaTime = dwCurrentTime - _prevAPITickCount;
+        _prevAPITickCount = dwCurrentTime;
+
+        if(_prevAPITickCount == 0)
+        {
+            dwDeltaTime = 0;
+        }
+        if(dwDeltaTime > 0x0fffffff)
+        {
+            // Either wraparound or data race.
+            dwDeltaTime = 0;
+        }
+        if(dwDeltaTime > 99999)
+        {
+            dwDeltaTime = 99999;
+        }
+        sprintf (traceMessage, "(%2u:%2u:%2u:%3u |%5lu) ", systemTime.wHour,
+                 systemTime.wMinute, systemTime.wSecond,
+                 systemTime.wMilliseconds, dwDeltaTime);
+    }
+    // Messages is 12 characters.
+    return 22;
+}
+
+WebRtc_Word32 TraceWindows::AddBuildInfo(char* traceMessage) const
+{
+    // write data and time to text file
+    sprintf(traceMessage, "Build info: %s", BUILDINFO);
+    // Include NULL termination (hence + 1).
+    return static_cast<WebRtc_Word32>(strlen(traceMessage)+1);
+}
+
+WebRtc_Word32 TraceWindows::AddDateTimeInfo(char* traceMessage) const
+{
+    _prevAPITickCount = timeGetTime();
+    _prevTickCount = _prevAPITickCount;
+
+    SYSTEMTIME sysTime;
+    GetLocalTime (&sysTime);
+
+    TCHAR szDateStr[20];
+    TCHAR szTimeStr[20];
+    TCHAR *pSzDateStr = szDateStr;
+    TCHAR *pSzTimeStr = szTimeStr;
+
+    // Create date string (e.g. Apr 04 2002)
+    GetDateFormat(LOCALE_SYSTEM_DEFAULT, 0, &sysTime, TEXT("MMM dd yyyy"),
+                  szDateStr, 20);
+
+    // Create time string (e.g. 15:32:08)
+    GetTimeFormat(LOCALE_SYSTEM_DEFAULT, 0, &sysTime, TEXT("HH':'mm':'ss"),
+                  szTimeStr, 20);
+
+    sprintf(traceMessage, "Local Date: %s Local Time: %s", szDateStr,
+            szTimeStr);
+
+    // Include NULL termination (hence + 1).
+    return static_cast<WebRtc_Word32>(strlen(traceMessage)+ 1);
+}
+} // namespace webrtc

system_wrappers/source/trace_windows.h

@@ -0,0 +1,37 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_SYSTEM_WRAPPERS_SOURCE_TRACE_WINDOWS_H_
+#define WEBRTC_SYSTEM_WRAPPERS_SOURCE_TRACE_WINDOWS_H_
+
+#include "trace_impl.h"
+#include <stdio.h>
+#include <windows.h>
+
+namespace webrtc {
+class TraceWindows : public TraceImpl
+{
+public:
+    TraceWindows();
+      virtual ~TraceWindows();
+
+    virtual WebRtc_Word32 AddThreadId(char *traceMessage) const;
+    virtual WebRtc_Word32 AddTime(char* traceMessage,
+                                  const TraceLevel level) const;
+
+    virtual WebRtc_Word32 AddBuildInfo(char* traceMessage) const;
+    virtual WebRtc_Word32 AddDateTimeInfo(char* traceMessage) const;
+private:
+    volatile mutable WebRtc_UWord32    _prevAPITickCount;
+    volatile mutable WebRtc_UWord32   _prevTickCount;
+};
+} // namespace webrtc
+
+#endif // WEBRTC_SYSTEM_WRAPPERS_SOURCE_TRACE_WINDOWS_H_

system_wrappers/test/Test.cpp

@@ -0,0 +1,65 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include <cassert>
+#include <iostream>
+
+#ifdef _WIN32
+    #include <windows.h>
+    #include <tchar.h>
+#else
+    #include <stdio.h>
+    #define Sleep(x) usleep(x*1000)
+#endif
+
+#include "common_types.h"
+#include "trace.h"
+#include "cpu_wrapper.h"
+
+
+#ifdef _WIN32
+int _tmain(int argc, _TCHAR* argv[])
+#else
+int main(int argc, char* argv[])
+#endif
+{
+    Trace::CreateTrace();
+    Trace::SetTraceFile("testTrace.txt");
+    Trace::SetLevelFilter(webrtc::kTraceAll);
+
+    printf("Start system wrapper test\n");
+
+    printf("Number of cores detected:%u\n", (unsigned int)CpuWrapper::DetectNumberOfCores());
+
+    CpuWrapper* cpu = CpuWrapper::CreateCpu();
+
+    WebRtc_UWord32 numCores;
+    WebRtc_UWord32* cores;
+
+    for(int i = 0; i< 10;i++)
+    {
+        WebRtc_Word32 total = cpu->CpuUsageMultiCore(numCores, cores);
+
+        printf("\nNumCores:%d\n", (int)numCores);
+        printf("Total cpu:%d\n", (int)total);
+
+        for (WebRtc_UWord32 i = 0; i< numCores;i++)
+        {
+            printf("Core:%lu CPU:%lu \n", i, cores[i]);
+        }
+        Sleep(1000);
+    }
+
+    printf("Done system wrapper test\n");
+
+    delete cpu;
+
+    Trace::ReturnTrace();
+};

system_wrappers/test/TestSort/TestSort.cpp

@@ -0,0 +1,265 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include <cstdio>
+#include <algorithm>
+#include <cstring>
+
+#include "sort.h"
+#include "tick_util.h"
+
+// Excellent work polluting the global namespace Visual Studio...
+#undef max
+#undef min
+#include <limits>
+
+template<typename KeyType>
+struct LotsOfData
+{
+    KeyType key;
+    char data[64];
+};
+
+template<typename DataType>
+int Compare(const void* dataX, const void* dataY)
+{
+    DataType dataX = (DataType)*(const DataType*)dataX;
+    DataType dataY = (DataType)*(const DataType*)dataY;
+    if (dataX > dataY)
+    {
+        return 1;
+    }
+    else if (dataX < dataY)
+    {
+        return -1;
+    }
+
+    return 0;
+};
+
+template<typename DataType, typename KeyType>
+int CompareKey(const void* dataX, const void* dataY)
+{
+    KeyType keyX = ((const DataType*)dataX)->key;
+    KeyType keyY = ((const DataType*)dataY)->key;
+    if (keyX > keyY)
+    {
+        return 1;
+    }
+    else if (keyX < keyY)
+    {
+        return -1;
+    }
+
+    return 0;
+}
+
+template<typename DataType>
+struct KeyLessThan
+{
+    bool operator()(const DataType &dataX, const DataType &dataY) const
+    {
+        return dataX.key < dataY.key;
+    }
+};
+
+const char* TypeEnumToString(webrtc::Type type)
+{
+    switch (type)
+    {
+        using namespace webrtc;
+        case TYPE_Word8:
+            return "Word8";
+        case TYPE_UWord8:
+            return "UWord8";
+        case TYPE_Word16:
+            return "Word16";
+        case TYPE_UWord16:
+            return "UWord16";
+        case TYPE_Word32:
+            return "Word32";
+        case TYPE_UWord32:
+            return "UWord32";
+        case TYPE_Word64:
+            return "Word64";
+        case TYPE_UWord64:
+            return "UWord64";
+        case TYPE_Float32:
+            return "Float32";
+        case TYPE_Float64:
+            return "Float64";
+        default:
+            return "Unrecognized";
+    }
+}
+
+template<typename Type>
+Type TypedRand()
+{
+    if (std::numeric_limits<Type>::is_integer)
+    {
+        double floatRand = static_cast<double>(rand()) / RAND_MAX;
+        if (std::numeric_limits<Type>::is_signed)
+        {
+            floatRand -= 0.5;
+        }
+
+        // Uniform [-max()/2, max()/2] for signed
+        //         [0, max()] for unsigned
+        return static_cast<Type>(floatRand * std::numeric_limits<Type>::max());
+    }
+    else // Floating point
+    {
+        // Uniform [-0.5, 0.5]
+        // The outer cast is to remove template warnings.
+        return static_cast<Type>((static_cast<Type>(rand()) / RAND_MAX) - 0.5);
+    }
+}
+
+template<typename KeyType>
+void RunSortTest(webrtc::Type sortType, bool keySort)
+{
+    enum { DataLength = 1000 };
+    enum { NumOfTests = 10000 };
+    KeyType key[DataLength];
+    KeyType keyRef[DataLength];
+    LotsOfData<KeyType> data[DataLength];
+    LotsOfData<KeyType> dataRef[DataLength];
+    WebRtc_Word32 retVal = 0;
+
+    if (keySort)
+    {
+        printf("Running %s KeySort() tests...\n", TypeEnumToString(sortType));
+    }
+    else
+    {
+        printf("Running %s Sort() tests...\n", TypeEnumToString(sortType));
+    }
+
+    TickInterval accTicks;
+    for (int i = 0; i < NumOfTests; i++)
+    {
+        for (int j = 0; j < DataLength; j++)
+        {
+            key[j] = TypedRand<KeyType>();
+            data[j].key = key[j];
+            // Write index to payload. We use this later for verification.
+            sprintf(data[j].data, "%d", j);
+        }
+
+        memcpy(dataRef, data, sizeof(data));
+        memcpy(keyRef, key, sizeof(key));
+
+        retVal = 0;
+        TickTime t0 = TickTime::Now();
+        if (keySort)
+        {
+            retVal = webrtc::KeySort(data, key, DataLength, sizeof(LotsOfData<KeyType>),
+                sortType);
+
+            //std::sort(data, data + DataLength, KeyLessThan<KeyType>());
+            //qsort(data, DataLength, sizeof(LotsOfData<KeyType>),
+            //    CompareKey<LotsOfData<KeyType>, KeyType>);
+        }
+        else
+        {
+            retVal = webrtc::Sort(key, DataLength, sortType);
+
+            //std::sort(key, key + DataLength);
+            //qsort(key, DataLength, sizeof(KeyType), Compare<KeyType>);
+        }
+        TickTime t1 = TickTime::Now();
+        accTicks += (t1 - t0);
+
+        if (retVal != 0)
+        {
+            printf("Test failed at iteration %d:\n", i);
+            printf("Sort returned an error. ");
+            printf("It likely does not support the requested type\nExiting...\n");
+            exit(0);
+        }
+
+        // Reference sort.
+        if (!keySort)
+        {
+            std::sort(keyRef, keyRef + DataLength);
+        }
+
+        if (keySort)
+        {
+            for (int j = 0; j < DataLength - 1; j++)
+            {
+                if (data[j].key > data[j + 1].key)
+                {
+                    printf("Test failed at iteration %d:\n", i);
+                    printf("Keys are not monotonically increasing\nExiting...\n");
+                    exit(0);
+                }
+
+                int index = atoi(data[j].data);
+                if (index < 0 || index >= DataLength || data[j].key != dataRef[index].key)
+                {
+                    printf("Test failed at iteration %d:\n", i);
+                    printf("Payload data is corrupt\nExiting...\n");
+                    exit(0);
+                }
+            }
+        }
+        else
+        {
+            for (int j = 0; j < DataLength - 1; j++)
+            {
+                if (key[j] > key[j + 1])
+                {
+                    printf("Test failed at iteration %d:\n", i);
+                    printf("Data is not monotonically increasing\nExiting...\n");
+                    exit(0);
+                }
+            }
+
+            if (memcmp(key, keyRef, sizeof(key)) != 0)
+            {
+                printf("Test failed at iteration %d:\n", i);
+                printf("Sort data differs from std::sort reference\nExiting...\n");
+                exit(0);
+            }
+        }
+    }
+
+    printf("Compliance test passed over %d iterations\n", NumOfTests);
+
+    WebRtc_Word64 executeTime = accTicks.Milliseconds();
+    printf("Execute time: %.2f s\n\n", (float)executeTime / 1000);
+}
+
+int main()
+{
+    // Seed rand().
+    srand(42);
+    bool keySort = false;
+    for (int i = 0; i < 2; i++) {
+        RunSortTest<WebRtc_Word8>(webrtc::TYPE_Word8, keySort);
+        RunSortTest<WebRtc_UWord8>(webrtc::TYPE_UWord8, keySort);
+        RunSortTest<WebRtc_Word16>(webrtc::TYPE_Word16, keySort);
+        RunSortTest<WebRtc_UWord16>(webrtc::TYPE_UWord16, keySort);
+        RunSortTest<WebRtc_Word32>(webrtc::TYPE_Word32, keySort);
+        RunSortTest<WebRtc_UWord32>(webrtc::TYPE_UWord32, keySort);
+        RunSortTest<WebRtc_Word64>(webrtc::TYPE_Word64, keySort);
+        RunSortTest<WebRtc_UWord64>(webrtc::TYPE_UWord64, keySort);
+        RunSortTest<float>(webrtc::TYPE_Float32, keySort);
+        RunSortTest<double>(webrtc::TYPE_Float64, keySort);
+
+        keySort = !keySort;
+    }
+
+    printf("All tests passed\n");
+
+    return 0;
+}

system_wrappers/test/list/list.cc

@@ -0,0 +1,174 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "list_wrapper.h"
+
+const int kNumberOfElements = 10;
+
+void FailTest(bool failed)
+{
+    if (failed)
+    {
+        printf("Test failed!\n");
+        printf("Press enter to continue:");
+        getchar();
+        exit(0);
+    }
+}
+
+int GetStoredIntegerValue(ListItem* list_item)
+{
+    void* list_item_pointer = list_item->GetItem();
+    if (list_item_pointer != NULL)
+    {
+        return *(reinterpret_cast<int*>(list_item_pointer));
+    }
+    return static_cast<int>(list_item->GetUnsignedItem());
+}
+
+void PrintList(ListWrapper& list)
+{
+    ListItem* list_item = list.First();
+    printf("List: ");
+    while (list_item != NULL)
+    {
+        int item_value = GetStoredIntegerValue(list_item);
+        FailTest(item_value < 0);
+        printf(" %d",item_value);
+        list_item = list.Next(list_item);
+    }
+    printf("\n");
+}
+
+// The list should always be in ascending order
+void ListSanity(ListWrapper& list)
+{
+    if(list.Empty())
+    {
+      return;
+    }
+    ListItem* item_iter = list.First();
+    // Fake a previous value for the first iteration
+    int previous_value = GetStoredIntegerValue(item_iter) - 1;
+    while (item_iter != NULL)
+    {
+        const int value = GetStoredIntegerValue(item_iter);
+        FailTest(value != previous_value + 1);
+        previous_value = value;
+        item_iter = list.Next(item_iter);
+    }
+}
+
+int main(int /*argc*/, char* /*argv*/[])
+{
+    printf("List Test:\n");
+    int element_array[kNumberOfElements];
+    for (int i = 0; i < kNumberOfElements; i++)
+    {
+        element_array[i] = i;
+    }
+    // Test PushBack 1
+    ListWrapper test_list;
+    for (int i = 2; i < kNumberOfElements - 2; i++)
+    {
+        FailTest(test_list.PushBack((void*)&element_array[i]) != 0);
+    }
+    // Test PushBack 2
+    FailTest(test_list.PushBack(element_array[kNumberOfElements - 2]) != 0);
+    FailTest(test_list.PushBack(element_array[kNumberOfElements - 1]) != 0);
+    // Test PushFront 2
+    FailTest(test_list.PushFront(element_array[1]) != 0);
+    // Test PushFront 1
+    FailTest(test_list.PushFront((void*)&element_array[0]) != 0);
+    // Test GetSize
+    FailTest(test_list.GetSize() != kNumberOfElements);
+    PrintList(test_list);
+    //Test PopFront
+    FailTest(test_list.PopFront() != 0);
+    //Test PopBack
+    FailTest(test_list.PopBack() != 0);
+    // Test GetSize
+    FailTest(test_list.GetSize() != kNumberOfElements - 2);
+    // Test Empty
+    FailTest(test_list.Empty());
+    // Test First
+    ListItem* first_item = test_list.First();
+    FailTest(first_item == NULL);
+    // Test Last
+    ListItem* last_item = test_list.Last();
+    FailTest(last_item == NULL);
+    // Test Next
+    ListItem* second_item = test_list.Next(first_item);
+    FailTest(second_item == NULL);
+    FailTest(test_list.Next(last_item) != NULL);
+    FailTest(test_list.Next(NULL) != NULL);
+    // Test Previous
+    ListItem* second_to_last_item = test_list.Previous(last_item);
+    FailTest(second_to_last_item == NULL);
+    FailTest(test_list.Previous(first_item) != NULL);
+    FailTest(test_list.Previous(NULL) != NULL);
+    // Test GetUnsignedItem
+    FailTest(last_item->GetUnsignedItem() !=
+             kNumberOfElements - 2);
+    FailTest(last_item->GetItem() !=
+             NULL);
+    // Test GetItem
+    FailTest(GetStoredIntegerValue(second_to_last_item) !=
+             kNumberOfElements - 3);
+    FailTest(second_to_last_item->GetUnsignedItem() != 0);
+    // Pop last and first since they are pushed as unsigned items.
+    FailTest(test_list.PopFront() != 0);
+    FailTest(test_list.PopBack() != 0);
+    // Test Insert. Please note that old iterators are no longer valid at
+    // this point.
+    ListItem* insert_item_last = new ListItem(reinterpret_cast<void*>(&element_array[kNumberOfElements - 2]));
+    FailTest(test_list.Insert(test_list.Last(),insert_item_last) != 0);
+    FailTest(test_list.Insert(NULL,insert_item_last) == 0);
+    ListItem* insert_item_last2 = new ListItem(reinterpret_cast<void*>(&element_array[kNumberOfElements - 2]));
+    FailTest(test_list.Insert(insert_item_last2,NULL) == 0);
+    // test InsertBefore
+    ListItem* insert_item_first = new ListItem(reinterpret_cast<void*>(&element_array[1]));
+    FailTest(test_list.InsertBefore(test_list.First(),insert_item_first) != 0);
+    FailTest(test_list.InsertBefore(NULL,insert_item_first) == 0);
+    ListItem* insert_item_first2 = new ListItem(reinterpret_cast<void*>(&element_array[1]));
+    FailTest(test_list.InsertBefore(insert_item_first2,NULL) == 0);
+    PrintList(test_list);
+    ListSanity(test_list);
+    // Erase the whole list
+    int counter = 0;
+    while (test_list.PopFront() == 0)
+    {
+        FailTest(counter++ > kNumberOfElements);
+    }
+    PrintList(test_list);
+    // Test APIs when list is empty
+    FailTest(test_list.GetSize() != 0);
+    FailTest(test_list.PopFront() != -1);
+    FailTest(test_list.PopBack() != -1);
+    FailTest(!test_list.Empty());
+    FailTest(test_list.First() != NULL);
+    FailTest(test_list.Last() != NULL);
+    FailTest(test_list.Next(NULL) != NULL);
+    FailTest(test_list.Previous(NULL) != NULL);
+    FailTest(test_list.Erase(NULL) != -1);
+    // Test Insert APIs when list is empty
+    ListItem* new_item = new ListItem(reinterpret_cast<void*>(&element_array[0]));
+    FailTest(test_list.Insert(NULL,new_item) != 0);
+    FailTest(test_list.Empty());
+    FailTest(test_list.PopFront() != 0);
+    ListItem* new_item2 = new ListItem(reinterpret_cast<void*>(&element_array[0]));
+    FailTest(test_list.InsertBefore(NULL,new_item2) != 0);
+    FailTest(test_list.Empty());
+
+    printf("Tests passed successfully!\n");
+}

system_wrappers/test/map/map.cc

@@ -0,0 +1,112 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "map_wrapper.h"
+
+const int kNumberOfElements = 10;
+
+void FailTest(bool failed)
+{
+    if (failed)
+    {
+        printf("Test failed!\n");
+        printf("Press enter to continue:");
+        getchar();
+        exit(0);
+    }
+}
+
+int GetStoredIntegerValue(MapItem* map_item)
+{
+    void* map_item_pointer = map_item->GetItem();
+    if (map_item_pointer != NULL)
+    {
+        return *(reinterpret_cast<int*>(map_item_pointer));
+    }
+    return static_cast<int>(map_item->GetUnsignedId());
+}
+
+void PrintMap(MapWrapper& map)
+{
+    MapItem* map_item = map.First();
+    printf("Map: ");
+    while (map_item != NULL)
+    {
+      int item_value = GetStoredIntegerValue(map_item);
+        FailTest(item_value < 0);
+        printf(" %d",item_value);
+        map_item = map.Next(map_item);
+    }
+    printf("\n");
+}
+
+int main(int /*argc*/, char* /*argv*/[])
+{
+    int element_array[kNumberOfElements];
+    for (int i = 0; i < kNumberOfElements; i++)
+    {
+        element_array[i] = i;
+    }
+    // Test insert
+    MapWrapper test_map;
+    for (int i = 0; i < kNumberOfElements; i++)
+    {
+        test_map.Insert(i,(void*)&element_array[i]);
+    }
+    // Test Erase1
+    MapItem* remove_item = test_map.Find(2);
+    FailTest(remove_item == NULL);
+    FailTest(test_map.Erase(remove_item) != 0);
+    FailTest(test_map.Find(2) != NULL);
+    remove_item = NULL;
+    FailTest(test_map.Erase(remove_item) != -1);
+    // Test Erase2
+    FailTest(test_map.Erase(1) != 0);
+    FailTest(test_map.Find(1) != NULL);
+    FailTest(test_map.Erase(1) != -1);
+    // Test Size
+    FailTest(test_map.Size() != kNumberOfElements - 2);
+    PrintMap(test_map);
+    // Test First
+    MapItem* first_item = test_map.First();
+    FailTest(first_item == NULL);
+    FailTest(GetStoredIntegerValue(first_item) != 0);
+    // Test Last
+    MapItem* last_item = test_map.Last();
+    FailTest(last_item == NULL);
+    FailTest(GetStoredIntegerValue(last_item) != 9);
+    // Test Next
+    MapItem* second_item = test_map.Next(first_item);
+    FailTest(second_item == NULL);
+    FailTest(GetStoredIntegerValue(second_item) != 3);
+    FailTest(test_map.Next(last_item) != NULL);
+    // Test Previous
+    MapItem* second_to_last_item = test_map.Previous(last_item);
+    FailTest(second_to_last_item == NULL);
+    FailTest(GetStoredIntegerValue(second_to_last_item) != 8);
+    FailTest(test_map.Previous(first_item) != NULL);
+    // Test Find (only improper usage untested)
+    FailTest(test_map.Find(kNumberOfElements + 2) != NULL);
+    // Test GetId
+    FailTest(*(reinterpret_cast<int*>(second_to_last_item->GetItem())) !=
+         second_to_last_item->GetId());
+    FailTest(second_to_last_item->GetUnsignedId() !=
+             static_cast<unsigned int>(second_to_last_item->GetId()));
+    // Test SetItem
+    int swapped_item = kNumberOfElements;
+    last_item->SetItem(reinterpret_cast<void*>(&swapped_item));
+    FailTest(GetStoredIntegerValue(last_item) !=
+             swapped_item);
+
+    printf("Tests passed successfully!\n");
+}