81 lines
2.2 KiB
C++
81 lines
2.2 KiB
C++
// Copyright (c) 2011 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/synchronization/condition_variable.h"
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#include <errno.h>
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#include <sys/time.h>
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#include "base/logging.h"
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#include "base/synchronization/lock.h"
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#include "base/threading/thread_restrictions.h"
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#include "base/time/time.h"
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namespace base {
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ConditionVariable::ConditionVariable(Lock* user_lock)
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: user_mutex_(user_lock->lock_.os_lock())
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#if !defined(NDEBUG)
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, user_lock_(user_lock)
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#endif
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{
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int rv = pthread_cond_init(&condition_, NULL);
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DCHECK_EQ(0, rv);
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}
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ConditionVariable::~ConditionVariable() {
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int rv = pthread_cond_destroy(&condition_);
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DCHECK_EQ(0, rv);
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}
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void ConditionVariable::Wait() {
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base::ThreadRestrictions::AssertWaitAllowed();
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#if !defined(NDEBUG)
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user_lock_->CheckHeldAndUnmark();
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#endif
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int rv = pthread_cond_wait(&condition_, user_mutex_);
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DCHECK_EQ(0, rv);
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#if !defined(NDEBUG)
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user_lock_->CheckUnheldAndMark();
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#endif
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}
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void ConditionVariable::TimedWait(const TimeDelta& max_time) {
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base::ThreadRestrictions::AssertWaitAllowed();
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int64 usecs = max_time.InMicroseconds();
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// The timeout argument to pthread_cond_timedwait is in absolute time.
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struct timeval now;
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gettimeofday(&now, NULL);
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struct timespec abstime;
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abstime.tv_sec = now.tv_sec + (usecs / Time::kMicrosecondsPerSecond);
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abstime.tv_nsec = (now.tv_usec + (usecs % Time::kMicrosecondsPerSecond)) *
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Time::kNanosecondsPerMicrosecond;
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abstime.tv_sec += abstime.tv_nsec / Time::kNanosecondsPerSecond;
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abstime.tv_nsec %= Time::kNanosecondsPerSecond;
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DCHECK_GE(abstime.tv_sec, now.tv_sec); // Overflow paranoia
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#if !defined(NDEBUG)
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user_lock_->CheckHeldAndUnmark();
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#endif
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int rv = pthread_cond_timedwait(&condition_, user_mutex_, &abstime);
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DCHECK(rv == 0 || rv == ETIMEDOUT);
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#if !defined(NDEBUG)
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user_lock_->CheckUnheldAndMark();
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#endif
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}
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void ConditionVariable::Broadcast() {
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int rv = pthread_cond_broadcast(&condition_);
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DCHECK_EQ(0, rv);
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}
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void ConditionVariable::Signal() {
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int rv = pthread_cond_signal(&condition_);
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DCHECK_EQ(0, rv);
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}
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} // namespace base
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