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Atomic32Wrapper -> Atomic32

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This change does the following:

* Remove the Atomic32Wrapper and AtomicImpl classes and provide the Atomic32
  implementation directly via platform specific source files.
* Move/rename/delete all source files accordingly
* The atomic value itself is now volatile. Previously it was only the pointer to
  the memory that was volatile, but not the actual value.
* No additional heap allocations are now done for the atomic value.

In a follow up cl I plan to start using Atomic32 in the RefCount class in order
to fix issues reported by Coverity.
Review URL: https://webrtc-codereview.appspot.com/490004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@2065 4adac7df-926f-26a2-2b94-8c16560cd09d
This commit is contained in:
tommi@webrtc.org
2012-04-19 14:28:45 +00:00
parent 1cd1162c7a
commit e84373c38f
14 changed files with 281 additions and 509 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
src/modules/audio_conference_mixer/source/memory_pool_win.h
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@@ -1,5 +1,5 @@
/*
* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
* Copyright (c) 2012 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
@@ -15,7 +15,7 @@
#include <windows.h>
#include "aligned_malloc.h"
#include "atomic32_wrapper.h"
#include "atomic32.h"
#include "typedefs.h"
namespace webrtc {
@@ -66,8 +66,8 @@ private:
// Atomic single linked list head.
PSLIST_HEADER _pListHead;
Atomic32Wrapper _createdMemory;
Atomic32Wrapper _outstandingMemory;
Atomic32 _createdMemory;
Atomic32 _outstandingMemory;
};
template<class MemoryType>

8
src/modules/udp_transport/source/udp_socket2_manager_windows.h
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@@ -1,5 +1,5 @@
/*
* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
* Copyright (c) 2012 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
@@ -17,7 +17,7 @@
#include <winsock2.h>
#include "atomic32_wrapper.h"
#include "atomic32.h"
#include "critical_section_wrapper.h"
#include "event_wrapper.h"
#include "list_wrapper.h"
@@ -88,8 +88,8 @@ private:
PSLIST_HEADER _pListHead;
bool _init;
Atomic32Wrapper _size;
Atomic32Wrapper _inUse;
Atomic32 _size;
Atomic32 _inUse;
};

8
src/modules/udp_transport/source/udp_socket2_windows.h
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@@ -19,7 +19,7 @@
#include <Ntddndis.h>
#include <traffic.h>
#include "atomic32_wrapper.h"
#include "atomic32.h"
#include "condition_variable_wrapper.h"
#include "critical_section_wrapper.h"
#include "event_wrapper.h"
@@ -129,8 +129,8 @@ private:
UdpSocket2ManagerWindows* _mgr;
CriticalSectionWrapper* _pCrit;
Atomic32Wrapper _outstandingCalls;
Atomic32Wrapper _outstandingCallComplete;
Atomic32 _outstandingCalls;
Atomic32 _outstandingCallComplete;
volatile bool _terminate;
volatile bool _addedToMgr;
@@ -165,7 +165,7 @@ private:
// Holds the current pcp value. Can be -2 or 0 - 7.
int _pcp;
Atomic32Wrapper _receiveBuffers;
Atomic32 _receiveBuffers;
};
} // namespace webrtc
#endif // WEBRTC_MODULES_UDP_TRANSPORT_SOURCE_UDP_SOCKET2_WINDOWS_H_

65
src/system_wrappers/interface/atomic32.h Normal file
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@@ -0,0 +1,65 @@
/*
* Copyright (c) 2012 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 independent 32-bit integer. Unless you know what you're
// doing, use locks instead! :-)
//
// Note: uses full memory barriers.
// Note: assumes 32-bit (or higher) system
#ifndef WEBRTC_SYSTEM_WRAPPERS_INTERFACE_ATOMIC32_H_
#define WEBRTC_SYSTEM_WRAPPERS_INTERFACE_ATOMIC32_H_
#include <cstddef>
#include "common_types.h"
#include "constructor_magic.h"
namespace webrtc {
// 32 bit atomic variable. Note that this class relies on the compiler to
// align the 32 bit value correctly (on a 32 bit boundary), so as long as you're
// not doing things like reinterpret_cast over some custom allocated memory
// without being careful with alignment, you should be fine.
class Atomic32
{
public:
Atomic32(WebRtc_Word32 initialValue = 0);
~Atomic32();
// Prefix operator!
WebRtc_Word32 operator++();
WebRtc_Word32 operator--();
WebRtc_Word32 operator+=(WebRtc_Word32 value);
WebRtc_Word32 operator-=(WebRtc_Word32 value);
// 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.
Atomic32 operator+(const Atomic32& other);
Atomic32 operator-(const Atomic32& other);
// Checks if |_value| is 32bit aligned.
inline bool Is32bitAligned() const {
return (reinterpret_cast<ptrdiff_t>(&_value) & 3) == 0;
}
DISALLOW_COPY_AND_ASSIGN(Atomic32);
WebRtc_Word32 _value;
};
} // namespace webrtc
#endif // WEBRTC_SYSTEM_WRAPPERS_INTERFACE_ATOMIC32_H_

55
src/system_wrappers/interface/atomic32_wrapper.h
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@@ -1,55 +0,0 @@
/*
* 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_

6
src/system_wrappers/interface/ref_count.h
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@@ -1,5 +1,5 @@
/*
* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
* Copyright (c) 2012 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
@@ -11,7 +11,7 @@
#ifndef SYSTEM_WRAPPERS_INTERFACE_REF_COUNT_H_
#define SYSTEM_WRAPPERS_INTERFACE_REF_COUNT_H_
#include "system_wrappers/interface/atomic32_wrapper.h"
#include "system_wrappers/interface/atomic32.h"
namespace webrtc {
@@ -74,7 +74,7 @@ class RefCountImpl : public T {
}
protected:
Atomic32Wrapper ref_count_;
Atomic32 ref_count_;
};
} // namespace webrtc

84
src/system_wrappers/source/atomic32.cc
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@@ -1,84 +0,0 @@
/*
* 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_win.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

64
src/system_wrappers/source/atomic32_linux.cc Normal file
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@@ -0,0 +1,64 @@
/*
* Copyright (c) 2012 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.h"
#include <assert.h>
#include <inttypes.h>
#include <malloc.h>
#include "common_types.h"
namespace webrtc {
Atomic32::Atomic32(WebRtc_Word32 initialValue) : _value(initialValue)
{
assert(Is32bitAligned());
}
Atomic32::~Atomic32()
{
}
WebRtc_Word32 Atomic32::operator++()
{
return __sync_fetch_and_add(&_value, 1) + 1;
}
WebRtc_Word32 Atomic32::operator--()
{
return __sync_fetch_and_sub(&_value, 1) - 1;
}
WebRtc_Word32 Atomic32::operator+=(WebRtc_Word32 value)
{
WebRtc_Word32 returnValue = __sync_fetch_and_add(&_value, value);
returnValue += value;
return returnValue;
}
WebRtc_Word32 Atomic32::operator-=(WebRtc_Word32 value)
{
WebRtc_Word32 returnValue = __sync_fetch_and_sub(&_value, value);
returnValue -= value;
return returnValue;
}
bool Atomic32::CompareExchange(WebRtc_Word32 newValue,
WebRtc_Word32 compareValue)
{
return __sync_bool_compare_and_swap(&_value, compareValue, newValue);
}
WebRtc_Word32 Atomic32::Value() const
{
return _value;
}
} // namespace webrtc

119
src/system_wrappers/source/atomic32_linux.h
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@@ -1,119 +0,0 @@
/*
* 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_

60
src/system_wrappers/source/atomic32_mac.cc Normal file
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@@ -0,0 +1,60 @@
/*
* Copyright (c) 2012 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.h"
#include <assert.h>
#include <libkern/OSAtomic.h>
#include <stdlib.h>
#include "common_types.h"
namespace webrtc {
Atomic32::Atomic32(WebRtc_Word32 initialValue) : _value(initialValue)
{
assert(Is32bitAligned());
}
Atomic32::~Atomic32()
{
}
WebRtc_Word32 Atomic32::operator++()
{
return OSAtomicIncrement32Barrier(&_value);
}
WebRtc_Word32 Atomic32::operator--()
{
return OSAtomicDecrement32Barrier(&_value);
}
WebRtc_Word32 Atomic32::operator+=(WebRtc_Word32 value)
{
return OSAtomicAdd32Barrier(value, &_value);
}
WebRtc_Word32 Atomic32::operator-=(WebRtc_Word32 value)
{
return OSAtomicAdd32Barrier(-value, &_value);
}
bool Atomic32::CompareExchange(WebRtc_Word32 newValue,
WebRtc_Word32 compareValue)
{
return OSAtomicCompareAndSwap32Barrier(compareValue, newValue, &_value);
}
WebRtc_Word32 Atomic32::Value() const
{
return _value;
}
} // namespace webrtc

117
src/system_wrappers/source/atomic32_mac.h
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@@ -1,117 +0,0 @@
/*
* 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_

72
src/system_wrappers/source/atomic32_win.cc Normal file
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@@ -0,0 +1,72 @@
/*
* Copyright (c) 2012 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.h"
#include <assert.h>
#include <windows.h>
#include "common_types.h"
#include "compile_assert.h"
namespace webrtc {
Atomic32::Atomic32(WebRtc_Word32 initialValue) : _value(initialValue)
{
// Make sure that the counter variable we're using is of the same size
// as what the API expects.
COMPILE_ASSERT(sizeof(_value) == sizeof(LONG), atomic_size_mismatch);
assert(Is32bitAligned());
}
Atomic32::~Atomic32()
{
}
WebRtc_Word32 Atomic32::operator++()
{
return static_cast<WebRtc_Word32>(InterlockedIncrement(
reinterpret_cast<volatile LONG*>(&_value)));
}
WebRtc_Word32 Atomic32::operator--()
{
return static_cast<WebRtc_Word32>(InterlockedDecrement(
reinterpret_cast<volatile LONG*>(&_value)));
}
WebRtc_Word32 Atomic32::operator+=(WebRtc_Word32 value)
{
return InterlockedExchangeAdd(reinterpret_cast<volatile LONG*>(&_value),
value);
}
WebRtc_Word32 Atomic32::operator-=(WebRtc_Word32 value)
{
return InterlockedExchangeAdd(reinterpret_cast<volatile LONG*>(&_value),
-value);
}
bool Atomic32::CompareExchange(WebRtc_Word32 newValue,
WebRtc_Word32 compareValue)
{
const LONG oldValue = InterlockedCompareExchange(
reinterpret_cast<volatile LONG*>(&_value),
newValue,
compareValue);
// If the old value and the compare value is the same an exchange happened.
return (oldValue == compareValue);
}
WebRtc_Word32 Atomic32::Value() const
{
return _value;
}
} // namespace webrtc

113
src/system_wrappers/source/atomic32_win.h
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@@ -1,113 +0,0 @@
/*
* 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_

11
src/system_wrappers/source/system_wrappers.gyp
View File

@@ -1,4 +1,4 @@
# Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
# Copyright (c) 2012 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
@@ -23,7 +23,7 @@
},
'sources': [
'../interface/aligned_malloc.h',
'../interface/atomic32_wrapper.h',
'../interface/atomic32.h',
'../interface/compile_assert.h',
'../interface/condition_variable_wrapper.h',
'../interface/cpu_info.h',
@@ -48,10 +48,9 @@
'../interface/tick_util.h',
'../interface/trace.h',
'aligned_malloc.cc',
'atomic32.cc',
'atomic32_linux.h',
'atomic32_mac.h',
'atomic32_win.h',
'atomic32_linux.cc',
'atomic32_mac.cc',
'atomic32_win.cc',
'condition_variable.cc',
'condition_variable_posix.cc',
'condition_variable_posix.h',