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| 1 // Copyright (c) 2011 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/synchronization/condition_variable.h" | |
| 6 | |
| 7 #include <errno.h> | |
| 8 #include <sys/time.h> | |
| 9 | |
| 10 #include "base/logging.h" | |
| 11 #include "base/synchronization/lock.h" | |
| 12 #include "base/threading/thread_restrictions.h" | |
| 13 #include "base/time/time.h" | |
| 14 | |
| 15 namespace base { | |
| 16 | |
| 17 ConditionVariable::ConditionVariable(Lock* user_lock) | |
| 18 : user_mutex_(user_lock->lock_.native_handle()) | |
| 19 #if !defined(NDEBUG) || defined(DCHECK_ALWAYS_ON) | |
| 20 , user_lock_(user_lock) | |
| 21 #endif | |
| 22 { | |
| 23 int rv = 0; | |
| 24 // http://crbug.com/293736 | |
| 25 // NaCl doesn't support monotonic clock based absolute deadlines. | |
| 26 // On older Android platform versions, it's supported through the | |
| 27 // non-standard pthread_cond_timedwait_monotonic_np. Newer platform | |
| 28 // versions have pthread_condattr_setclock. | |
| 29 // Mac can use relative time deadlines. | |
| 30 #if !defined(OS_MACOSX) && !defined(OS_NACL) && \ | |
| 31 !(defined(OS_ANDROID) && defined(HAVE_PTHREAD_COND_TIMEDWAIT_MONOTONIC)) | |
| 32 pthread_condattr_t attrs; | |
| 33 rv = pthread_condattr_init(&attrs); | |
| 34 DCHECK_EQ(0, rv); | |
| 35 pthread_condattr_setclock(&attrs, CLOCK_MONOTONIC); | |
| 36 rv = pthread_cond_init(&condition_, &attrs); | |
| 37 pthread_condattr_destroy(&attrs); | |
| 38 #else | |
| 39 rv = pthread_cond_init(&condition_, NULL); | |
| 40 #endif | |
| 41 DCHECK_EQ(0, rv); | |
| 42 } | |
| 43 | |
| 44 ConditionVariable::~ConditionVariable() { | |
| 45 int rv = pthread_cond_destroy(&condition_); | |
| 46 DCHECK_EQ(0, rv); | |
| 47 } | |
| 48 | |
| 49 void ConditionVariable::Wait() { | |
| 50 base::ThreadRestrictions::AssertWaitAllowed(); | |
| 51 #if !defined(NDEBUG) || defined(DCHECK_ALWAYS_ON) | |
| 52 user_lock_->CheckHeldAndUnmark(); | |
| 53 #endif | |
| 54 int rv = pthread_cond_wait(&condition_, user_mutex_); | |
| 55 DCHECK_EQ(0, rv); | |
| 56 #if !defined(NDEBUG) || defined(DCHECK_ALWAYS_ON) | |
| 57 user_lock_->CheckUnheldAndMark(); | |
| 58 #endif | |
| 59 } | |
| 60 | |
| 61 void ConditionVariable::TimedWait(const TimeDelta& max_time) { | |
| 62 base::ThreadRestrictions::AssertWaitAllowed(); | |
| 63 int64 usecs = max_time.InMicroseconds(); | |
| 64 struct timespec relative_time; | |
| 65 relative_time.tv_sec = usecs / Time::kMicrosecondsPerSecond; | |
| 66 relative_time.tv_nsec = | |
| 67 (usecs % Time::kMicrosecondsPerSecond) * Time::kNanosecondsPerMicrosecond; | |
| 68 | |
| 69 #if !defined(NDEBUG) || defined(DCHECK_ALWAYS_ON) | |
| 70 user_lock_->CheckHeldAndUnmark(); | |
| 71 #endif | |
| 72 | |
| 73 #if defined(OS_MACOSX) | |
| 74 int rv = pthread_cond_timedwait_relative_np( | |
| 75 &condition_, user_mutex_, &relative_time); | |
| 76 #else | |
| 77 // The timeout argument to pthread_cond_timedwait is in absolute time. | |
| 78 struct timespec absolute_time; | |
| 79 #if defined(OS_NACL) | |
| 80 // See comment in constructor for why this is different in NaCl. | |
| 81 struct timeval now; | |
| 82 gettimeofday(&now, NULL); | |
| 83 absolute_time.tv_sec = now.tv_sec; | |
| 84 absolute_time.tv_nsec = now.tv_usec * Time::kNanosecondsPerMicrosecond; | |
| 85 #else | |
| 86 struct timespec now; | |
| 87 clock_gettime(CLOCK_MONOTONIC, &now); | |
| 88 absolute_time.tv_sec = now.tv_sec; | |
| 89 absolute_time.tv_nsec = now.tv_nsec; | |
| 90 #endif | |
| 91 | |
| 92 absolute_time.tv_sec += relative_time.tv_sec; | |
| 93 absolute_time.tv_nsec += relative_time.tv_nsec; | |
| 94 absolute_time.tv_sec += absolute_time.tv_nsec / Time::kNanosecondsPerSecond; | |
| 95 absolute_time.tv_nsec %= Time::kNanosecondsPerSecond; | |
| 96 DCHECK_GE(absolute_time.tv_sec, now.tv_sec); // Overflow paranoia | |
| 97 | |
| 98 #if defined(OS_ANDROID) && defined(HAVE_PTHREAD_COND_TIMEDWAIT_MONOTONIC) | |
| 99 int rv = pthread_cond_timedwait_monotonic_np( | |
| 100 &condition_, user_mutex_, &absolute_time); | |
| 101 #else | |
| 102 int rv = pthread_cond_timedwait(&condition_, user_mutex_, &absolute_time); | |
| 103 #endif // OS_ANDROID && HAVE_PTHREAD_COND_TIMEDWAIT_MONOTONIC | |
| 104 #endif // OS_MACOSX | |
| 105 | |
| 106 DCHECK(rv == 0 || rv == ETIMEDOUT); | |
| 107 #if !defined(NDEBUG) || defined(DCHECK_ALWAYS_ON) | |
| 108 user_lock_->CheckUnheldAndMark(); | |
| 109 #endif | |
| 110 } | |
| 111 | |
| 112 void ConditionVariable::Broadcast() { | |
| 113 int rv = pthread_cond_broadcast(&condition_); | |
| 114 DCHECK_EQ(0, rv); | |
| 115 } | |
| 116 | |
| 117 void ConditionVariable::Signal() { | |
| 118 int rv = pthread_cond_signal(&condition_); | |
| 119 DCHECK_EQ(0, rv); | |
| 120 } | |
| 121 | |
| 122 } // namespace base | |
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