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