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 1418 : ConditionVariable::ConditionVariable(Lock* user_lock)
19 1418 : : user_mutex_(user_lock->lock_impl()->os_lock()) {
20 1418 : int rv = pthread_cond_init(&condition_, NULL);
21 1418 : DCHECK(rv == 0);
22 1418 : }
23 :
24 1418 : ConditionVariable::~ConditionVariable() {
25 1418 : int rv = pthread_cond_destroy(&condition_);
26 1418 : DCHECK(rv == 0);
27 1418 : }
28 :
29 1418 : void ConditionVariable::Wait() {
30 1418 : int rv = pthread_cond_wait(&condition_, user_mutex_);
31 1418 : DCHECK(rv == 0);
32 1418 : }
33 :
34 0 : void ConditionVariable::TimedWait(const TimeDelta& max_time) {
35 0 : int64 usecs = max_time.InMicroseconds();
36 :
37 : // The timeout argument to pthread_cond_timedwait is in absolute time.
38 : struct timeval now;
39 0 : gettimeofday(&now, NULL);
40 :
41 : struct timespec abstime;
42 0 : abstime.tv_sec = now.tv_sec + (usecs / Time::kMicrosecondsPerSecond);
43 : abstime.tv_nsec = (now.tv_usec + (usecs % Time::kMicrosecondsPerSecond)) *
44 0 : Time::kNanosecondsPerMicrosecond;
45 0 : abstime.tv_sec += abstime.tv_nsec / Time::kNanosecondsPerSecond;
46 0 : abstime.tv_nsec %= Time::kNanosecondsPerSecond;
47 0 : DCHECK(abstime.tv_sec >= now.tv_sec); // Overflow paranoia
48 :
49 0 : int rv = pthread_cond_timedwait(&condition_, user_mutex_, &abstime);
50 0 : DCHECK(rv == 0 || rv == ETIMEDOUT);
51 0 : }
52 :
53 1418 : void ConditionVariable::Broadcast() {
54 1418 : int rv = pthread_cond_broadcast(&condition_);
55 1418 : DCHECK(rv == 0);
56 1418 : }
57 :
58 0 : void ConditionVariable::Signal() {
59 0 : int rv = pthread_cond_signal(&condition_);
60 0 : DCHECK(rv == 0);
61 0 : }
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