1/* 2 * Copyright (c) 2011 The WebRTC project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11#include "webrtc/system_wrappers/source/condition_variable_posix.h" 12 13#include <errno.h> 14#if defined(WEBRTC_LINUX) 15#include <time.h> 16#else 17#include <sys/time.h> 18#endif 19 20#include "webrtc/system_wrappers/source/critical_section_posix.h" 21 22namespace webrtc { 23 24ConditionVariableWrapper* ConditionVariablePosix::Create() { 25 ConditionVariablePosix* ptr = new ConditionVariablePosix; 26 if (!ptr) { 27 return NULL; 28 } 29 30 const int error = ptr->Construct(); 31 if (error) { 32 delete ptr; 33 return NULL; 34 } 35 36 return ptr; 37} 38 39ConditionVariablePosix::ConditionVariablePosix() { 40} 41 42int ConditionVariablePosix::Construct() { 43#ifdef WEBRTC_CLOCK_TYPE_REALTIME 44 pthread_cond_init(&cond_, NULL); 45#else 46 int result = 0; 47 pthread_condattr_t cond_attr; 48 result = pthread_condattr_init(&cond_attr); 49 if (result != 0) { 50 return -1; 51 } 52 result = pthread_condattr_setclock(&cond_attr, CLOCK_MONOTONIC); 53 if (result != 0) { 54 return -1; 55 } 56 result = pthread_cond_init(&cond_, &cond_attr); 57 if (result != 0) { 58 return -1; 59 } 60 result = pthread_condattr_destroy(&cond_attr); 61 if (result != 0) { 62 return -1; 63 } 64#endif 65 return 0; 66} 67 68ConditionVariablePosix::~ConditionVariablePosix() { 69 pthread_cond_destroy(&cond_); 70} 71 72void ConditionVariablePosix::SleepCS(CriticalSectionWrapper& crit_sect) { 73 CriticalSectionPosix* cs = reinterpret_cast<CriticalSectionPosix*>( 74 &crit_sect); 75 pthread_cond_wait(&cond_, &cs->mutex_); 76} 77 78bool ConditionVariablePosix::SleepCS(CriticalSectionWrapper& crit_sect, 79 unsigned long max_time_inMS) { 80 const unsigned long INFINITE = 0xFFFFFFFF; 81 const int MILLISECONDS_PER_SECOND = 1000; 82#ifndef WEBRTC_LINUX 83 const int MICROSECONDS_PER_MILLISECOND = 1000; 84#endif 85 const int NANOSECONDS_PER_SECOND = 1000000000; 86 const int NANOSECONDS_PER_MILLISECOND = 1000000; 87 88 CriticalSectionPosix* cs = reinterpret_cast<CriticalSectionPosix*>( 89 &crit_sect); 90 91 if (max_time_inMS != INFINITE) { 92 timespec ts; 93#ifndef WEBRTC_MAC 94#ifdef WEBRTC_CLOCK_TYPE_REALTIME 95 clock_gettime(CLOCK_REALTIME, &ts); 96#else 97 clock_gettime(CLOCK_MONOTONIC, &ts); 98#endif 99#else // WEBRTC_MAC 100 struct timeval tv; 101 gettimeofday(&tv, 0); 102 ts.tv_sec = tv.tv_sec; 103 ts.tv_nsec = tv.tv_usec * MICROSECONDS_PER_MILLISECOND; 104#endif 105 106 ts.tv_sec += max_time_inMS / MILLISECONDS_PER_SECOND; 107 ts.tv_nsec += 108 (max_time_inMS 109 - ((max_time_inMS / MILLISECONDS_PER_SECOND) * MILLISECONDS_PER_SECOND)) 110 * NANOSECONDS_PER_MILLISECOND; 111 112 if (ts.tv_nsec >= NANOSECONDS_PER_SECOND) { 113 ts.tv_sec += ts.tv_nsec / NANOSECONDS_PER_SECOND; 114 ts.tv_nsec %= NANOSECONDS_PER_SECOND; 115 } 116 const int res = pthread_cond_timedwait(&cond_, &cs->mutex_, &ts); 117 return (res == ETIMEDOUT) ? false : true; 118 } else { 119 pthread_cond_wait(&cond_, &cs->mutex_); 120 return true; 121 } 122} 123 124void ConditionVariablePosix::Wake() { 125 pthread_cond_signal(&cond_); 126} 127 128void ConditionVariablePosix::WakeAll() { 129 pthread_cond_broadcast(&cond_); 130} 131 132} // namespace webrtc 133