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1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "base/synchronization/condition_variable.h" | 5 #include "base/synchronization/condition_variable.h" |
6 | 6 |
7 #include <errno.h> | 7 #include <errno.h> |
8 #include <sys/time.h> | 8 #include <sys/time.h> |
9 | 9 |
10 #include "base/logging.h" | 10 #include "base/logging.h" |
11 #include "base/synchronization/lock.h" | 11 #include "base/synchronization/lock.h" |
12 #include "base/threading/thread_restrictions.h" | 12 #include "base/threading/thread_restrictions.h" |
13 #include "base/time/time.h" | 13 #include "base/time/time.h" |
14 | 14 |
15 namespace base { | 15 namespace base { |
16 | 16 |
17 ConditionVariable::ConditionVariable(Lock* user_lock) | 17 ConditionVariable::ConditionVariable(Lock* user_lock) |
18 : user_mutex_(user_lock->lock_.native_handle()) | 18 : user_mutex_(user_lock->lock_.native_handle()) |
19 #if !defined(NDEBUG) | 19 #if !defined(NDEBUG) |
20 , user_lock_(user_lock) | 20 , user_lock_(user_lock) |
21 #endif | 21 #endif |
22 { | 22 { |
23 int rv = pthread_cond_init(&condition_, NULL); | 23 int rv = 0; |
24 // http://crbug.com/293736 | |
25 // Mac and NaCl don't support monotonic clock based deadlines. | |
26 // Android supports it through the non-standard | |
27 // pthread_cond_timedwait_monotonic_np. | |
28 #if !defined(OS_MACOSX) && !defined(OS_NACL) && !defined(OS_ANDROID) | |
29 pthread_condattr_t attrs; | |
30 rv = pthread_condattr_init(&attrs); | |
31 DCHECK_EQ(0, rv); | |
32 pthread_condattr_setclock(&attrs, CLOCK_MONOTONIC); | |
33 rv = pthread_cond_init(&condition_, &attrs); | |
34 pthread_condattr_destroy(&attrs); | |
35 #else | |
36 rv = pthread_cond_init(&condition_, NULL); | |
37 #endif | |
24 DCHECK_EQ(0, rv); | 38 DCHECK_EQ(0, rv); |
25 } | 39 } |
26 | 40 |
27 ConditionVariable::~ConditionVariable() { | 41 ConditionVariable::~ConditionVariable() { |
28 int rv = pthread_cond_destroy(&condition_); | 42 int rv = pthread_cond_destroy(&condition_); |
29 DCHECK_EQ(0, rv); | 43 DCHECK_EQ(0, rv); |
30 } | 44 } |
31 | 45 |
32 void ConditionVariable::Wait() { | 46 void ConditionVariable::Wait() { |
33 base::ThreadRestrictions::AssertWaitAllowed(); | 47 base::ThreadRestrictions::AssertWaitAllowed(); |
34 #if !defined(NDEBUG) | 48 #if !defined(NDEBUG) |
35 user_lock_->CheckHeldAndUnmark(); | 49 user_lock_->CheckHeldAndUnmark(); |
36 #endif | 50 #endif |
37 int rv = pthread_cond_wait(&condition_, user_mutex_); | 51 int rv = pthread_cond_wait(&condition_, user_mutex_); |
38 DCHECK_EQ(0, rv); | 52 DCHECK_EQ(0, rv); |
39 #if !defined(NDEBUG) | 53 #if !defined(NDEBUG) |
40 user_lock_->CheckUnheldAndMark(); | 54 user_lock_->CheckUnheldAndMark(); |
41 #endif | 55 #endif |
42 } | 56 } |
43 | 57 |
44 void ConditionVariable::TimedWait(const TimeDelta& max_time) { | 58 void ConditionVariable::TimedWait(const TimeDelta& max_time) { |
45 base::ThreadRestrictions::AssertWaitAllowed(); | 59 base::ThreadRestrictions::AssertWaitAllowed(); |
46 int64 usecs = max_time.InMicroseconds(); | 60 int64 usecs = max_time.InMicroseconds(); |
47 | 61 |
48 // The timeout argument to pthread_cond_timedwait is in absolute time. | 62 // The timeout argument to pthread_cond_timedwait is in absolute time. |
63 struct timespec abstime; | |
64 #if defined(OS_MACOSX) || defined(OS_NACL) | |
49 struct timeval now; | 65 struct timeval now; |
50 gettimeofday(&now, NULL); | 66 gettimeofday(&now, NULL); |
67 abstime.tv_sec = now.tv_sec; | |
68 abstime.tv_nsec = now.tv_usec * Time::kNanosecondsPerMicrosecond; | |
69 #else | |
70 struct timespec now; | |
71 clock_gettime(CLOCK_MONOTONIC, &now); | |
72 abstime.tv_sec = now.tv_sec; | |
73 abstime.tv_nsec = now.tv_nsec; | |
74 #endif | |
51 | 75 |
52 struct timespec abstime; | 76 abstime.tv_sec += usecs / Time::kMicrosecondsPerSecond; |
53 abstime.tv_sec = now.tv_sec + (usecs / Time::kMicrosecondsPerSecond); | 77 abstime.tv_nsec += |
54 abstime.tv_nsec = (now.tv_usec + (usecs % Time::kMicrosecondsPerSecond)) * | 78 (usecs % Time::kMicrosecondsPerSecond) * Time::kNanosecondsPerMicrosecond; |
55 Time::kNanosecondsPerMicrosecond; | |
56 abstime.tv_sec += abstime.tv_nsec / Time::kNanosecondsPerSecond; | 79 abstime.tv_sec += abstime.tv_nsec / Time::kNanosecondsPerSecond; |
57 abstime.tv_nsec %= Time::kNanosecondsPerSecond; | 80 abstime.tv_nsec %= Time::kNanosecondsPerSecond; |
58 DCHECK_GE(abstime.tv_sec, now.tv_sec); // Overflow paranoia | 81 DCHECK_GE(abstime.tv_sec, now.tv_sec); // Overflow paranoia |
59 | 82 |
60 #if !defined(NDEBUG) | 83 #if !defined(NDEBUG) |
61 user_lock_->CheckHeldAndUnmark(); | 84 user_lock_->CheckHeldAndUnmark(); |
62 #endif | 85 #endif |
86 #if defined(OS_ANDROID) | |
87 int rv = pthread_cond_timedwait_monotonic_np( | |
88 &condition_, user_mutex_, &abstime); | |
Nico
2013/10/01 21:20:42
I haven't used it before, but from some googling a
| |
89 #else | |
63 int rv = pthread_cond_timedwait(&condition_, user_mutex_, &abstime); | 90 int rv = pthread_cond_timedwait(&condition_, user_mutex_, &abstime); |
91 #endif | |
64 DCHECK(rv == 0 || rv == ETIMEDOUT); | 92 DCHECK(rv == 0 || rv == ETIMEDOUT); |
65 #if !defined(NDEBUG) | 93 #if !defined(NDEBUG) |
66 user_lock_->CheckUnheldAndMark(); | 94 user_lock_->CheckUnheldAndMark(); |
67 #endif | 95 #endif |
68 } | 96 } |
69 | 97 |
70 void ConditionVariable::Broadcast() { | 98 void ConditionVariable::Broadcast() { |
71 int rv = pthread_cond_broadcast(&condition_); | 99 int rv = pthread_cond_broadcast(&condition_); |
72 DCHECK_EQ(0, rv); | 100 DCHECK_EQ(0, rv); |
73 } | 101 } |
74 | 102 |
75 void ConditionVariable::Signal() { | 103 void ConditionVariable::Signal() { |
76 int rv = pthread_cond_signal(&condition_); | 104 int rv = pthread_cond_signal(&condition_); |
77 DCHECK_EQ(0, rv); | 105 DCHECK_EQ(0, rv); |
78 } | 106 } |
79 | 107 |
80 } // namespace base | 108 } // namespace base |
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