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