michael@0: // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
michael@0: // Use of this source code is governed by a BSD-style license that can be
michael@0: // found in the LICENSE file.
michael@0: 
michael@0: #include "base/condition_variable.h"
michael@0: 
michael@0: #include <errno.h>
michael@0: #include <sys/time.h>
michael@0: 
michael@0: #include "base/lock.h"
michael@0: #include "base/lock_impl.h"
michael@0: #include "base/logging.h"
michael@0: #include "base/time.h"
michael@0: 
michael@0: using base::Time;
michael@0: using base::TimeDelta;
michael@0: 
michael@0: ConditionVariable::ConditionVariable(Lock* user_lock)
michael@0:     : user_mutex_(user_lock->lock_impl()->os_lock()) {
michael@0:   int rv = 0;
michael@0: #if !defined(OS_MACOSX) && !defined(OS_ANDROID)
michael@0:   pthread_condattr_t attrs;
michael@0:   rv = pthread_condattr_init(&attrs);
michael@0:   DCHECK_EQ(0, rv);
michael@0:   pthread_condattr_setclock(&attrs, CLOCK_MONOTONIC);
michael@0:   rv = pthread_cond_init(&condition_, &attrs);
michael@0:   pthread_condattr_destroy(&attrs);
michael@0: #else
michael@0:   rv = pthread_cond_init(&condition_, NULL);
michael@0: #endif
michael@0:   DCHECK_EQ(0, rv);
michael@0: }
michael@0: 
michael@0: ConditionVariable::~ConditionVariable() {
michael@0:   int rv = pthread_cond_destroy(&condition_);
michael@0:   DCHECK(rv == 0);
michael@0: }
michael@0: 
michael@0: void ConditionVariable::Wait() {
michael@0:   int rv = pthread_cond_wait(&condition_, user_mutex_);
michael@0:   DCHECK(rv == 0);
michael@0: }
michael@0: 
michael@0: void ConditionVariable::TimedWait(const TimeDelta& max_time) {
michael@0:   int64_t usecs = max_time.InMicroseconds();
michael@0: 
michael@0:   struct timespec relative_time;
michael@0:   relative_time.tv_sec = usecs / Time::kMicrosecondsPerSecond;
michael@0:   relative_time.tv_nsec =
michael@0:       (usecs % Time::kMicrosecondsPerSecond) * Time::kNanosecondsPerMicrosecond;
michael@0: 
michael@0: #if defined(OS_MACOSX)
michael@0:   int rv = pthread_cond_timedwait_relative_np(
michael@0:       &condition_, user_mutex_, &relative_time);
michael@0: #else
michael@0:   // The timeout argument to pthread_cond_timedwait is in absolute time.
michael@0:   struct timespec now;
michael@0:   clock_gettime(CLOCK_MONOTONIC, &now);
michael@0: 
michael@0:   struct timespec absolute_time;
michael@0:   absolute_time.tv_sec = now.tv_sec;
michael@0:   absolute_time.tv_nsec = now.tv_nsec;
michael@0:   absolute_time.tv_sec += relative_time.tv_sec;
michael@0:   absolute_time.tv_nsec += relative_time.tv_nsec;
michael@0:   absolute_time.tv_sec += absolute_time.tv_nsec / Time::kNanosecondsPerSecond;
michael@0:   absolute_time.tv_nsec %= Time::kNanosecondsPerSecond;
michael@0:   DCHECK_GE(absolute_time.tv_sec, now.tv_sec);  // Overflow paranoia
michael@0: 
michael@0: #if defined(OS_ANDROID)
michael@0:   int rv = pthread_cond_timedwait_monotonic_np(
michael@0:       &condition_, user_mutex_, &absolute_time);
michael@0: #else
michael@0:   int rv = pthread_cond_timedwait(&condition_, user_mutex_, &absolute_time);
michael@0: #endif  // OS_ANDROID
michael@0: #endif  // OS_MACOSX
michael@0: 
michael@0:   DCHECK(rv == 0 || rv == ETIMEDOUT);
michael@0: }
michael@0: 
michael@0: void ConditionVariable::Broadcast() {
michael@0:   int rv = pthread_cond_broadcast(&condition_);
michael@0:   DCHECK(rv == 0);
michael@0: }
michael@0: 
michael@0: void ConditionVariable::Signal() {
michael@0:   int rv = pthread_cond_signal(&condition_);
michael@0:   DCHECK(rv == 0);
michael@0: }