1 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #include "base/condition_variable.h" 6 7 #include <errno.h> 8 #include <sys/time.h> 9 10 #include "base/lock.h" 11 #include "base/lock_impl.h" 12 #include "base/logging.h" 13 #include "base/time.h" 14 15 using base::Time; 16 using base::TimeDelta; 17 18 ConditionVariable::ConditionVariable(Lock* user_lock) 19 : user_mutex_(user_lock->lock_impl()->os_lock()) { 20 int rv = pthread_cond_init(&condition_, NULL); 21 DCHECK(rv == 0); 22 } 23 24 ConditionVariable::~ConditionVariable() { 25 int rv = pthread_cond_destroy(&condition_); 26 DCHECK(rv == 0); 27 } 28 29 void ConditionVariable::Wait() { 30 int rv = pthread_cond_wait(&condition_, user_mutex_); 31 DCHECK(rv == 0); 32 } 33 34 void ConditionVariable::TimedWait(const TimeDelta& max_time) { 35 int64 usecs = max_time.InMicroseconds(); 36 37 // The timeout argument to pthread_cond_timedwait is in absolute time. 38 struct timeval now; 39 gettimeofday(&now, NULL); 40 41 struct timespec abstime; 42 abstime.tv_sec = now.tv_sec + (usecs / Time::kMicrosecondsPerSecond); 43 abstime.tv_nsec = (now.tv_usec + (usecs % Time::kMicrosecondsPerSecond)) * 44 Time::kNanosecondsPerMicrosecond; 45 abstime.tv_sec += abstime.tv_nsec / Time::kNanosecondsPerSecond; 46 abstime.tv_nsec %= Time::kNanosecondsPerSecond; 47 DCHECK(abstime.tv_sec >= now.tv_sec); // Overflow paranoia 48 49 int rv = pthread_cond_timedwait(&condition_, user_mutex_, &abstime); 50 DCHECK(rv == 0 || rv == ETIMEDOUT); 51 } 52 53 void ConditionVariable::Broadcast() { 54 int rv = pthread_cond_broadcast(&condition_); 55 DCHECK(rv == 0); 56 } 57 58 void ConditionVariable::Signal() { 59 int rv = pthread_cond_signal(&condition_); 60 DCHECK(rv == 0); 61 } 62
