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1 // Copyright 2013 the V8 project authors. All rights reserved. | 1 // Copyright 2013 the V8 project 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 #ifndef V8_BASE_PLATFORM_CONDITION_VARIABLE_H_ | 5 #ifndef V8_BASE_PLATFORM_CONDITION_VARIABLE_H_ |
6 #define V8_BASE_PLATFORM_CONDITION_VARIABLE_H_ | 6 #define V8_BASE_PLATFORM_CONDITION_VARIABLE_H_ |
7 | 7 |
8 #include "src/base/lazy-instance.h" | 8 #include "src/base/lazy-instance.h" |
9 #include "src/base/platform/mutex.h" | 9 #include "src/base/platform/mutex.h" |
10 | 10 |
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21 // This class is a synchronization primitive that can be used to block a thread, | 21 // This class is a synchronization primitive that can be used to block a thread, |
22 // or multiple threads at the same time, until: | 22 // or multiple threads at the same time, until: |
23 // - a notification is received from another thread, | 23 // - a notification is received from another thread, |
24 // - a timeout expires, or | 24 // - a timeout expires, or |
25 // - a spurious wakeup occurs | 25 // - a spurious wakeup occurs |
26 // Any thread that intends to wait on a ConditionVariable has to acquire a lock | 26 // Any thread that intends to wait on a ConditionVariable has to acquire a lock |
27 // on a Mutex first. The |Wait()| and |WaitFor()| operations atomically release | 27 // on a Mutex first. The |Wait()| and |WaitFor()| operations atomically release |
28 // the mutex and suspend the execution of the calling thread. When the condition | 28 // the mutex and suspend the execution of the calling thread. When the condition |
29 // variable is notified, the thread is awakened, and the mutex is reacquired. | 29 // variable is notified, the thread is awakened, and the mutex is reacquired. |
30 | 30 |
31 class ConditionVariable FINAL { | 31 class ConditionVariable final { |
32 public: | 32 public: |
33 ConditionVariable(); | 33 ConditionVariable(); |
34 ~ConditionVariable(); | 34 ~ConditionVariable(); |
35 | 35 |
36 // If any threads are waiting on this condition variable, calling | 36 // If any threads are waiting on this condition variable, calling |
37 // |NotifyOne()| unblocks one of the waiting threads. | 37 // |NotifyOne()| unblocks one of the waiting threads. |
38 void NotifyOne(); | 38 void NotifyOne(); |
39 | 39 |
40 // Unblocks all threads currently waiting for this condition variable. | 40 // Unblocks all threads currently waiting for this condition variable. |
41 void NotifyAll(); | 41 void NotifyAll(); |
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56 // spuriously. When unblocked, regardless of the reason, the lock on the mutex | 56 // spuriously. When unblocked, regardless of the reason, the lock on the mutex |
57 // is reacquired and |WaitFor()| exits. Returns true if the condition variable | 57 // is reacquired and |WaitFor()| exits. Returns true if the condition variable |
58 // was notified prior to the timeout. | 58 // was notified prior to the timeout. |
59 bool WaitFor(Mutex* mutex, const TimeDelta& rel_time) WARN_UNUSED_RESULT; | 59 bool WaitFor(Mutex* mutex, const TimeDelta& rel_time) WARN_UNUSED_RESULT; |
60 | 60 |
61 // The implementation-defined native handle type. | 61 // The implementation-defined native handle type. |
62 #if V8_OS_POSIX | 62 #if V8_OS_POSIX |
63 typedef pthread_cond_t NativeHandle; | 63 typedef pthread_cond_t NativeHandle; |
64 #elif V8_OS_WIN | 64 #elif V8_OS_WIN |
65 struct Event; | 65 struct Event; |
66 class NativeHandle FINAL { | 66 class NativeHandle final { |
67 public: | 67 public: |
68 NativeHandle() : waitlist_(NULL), freelist_(NULL) {} | 68 NativeHandle() : waitlist_(NULL), freelist_(NULL) {} |
69 ~NativeHandle(); | 69 ~NativeHandle(); |
70 | 70 |
71 Event* Pre() WARN_UNUSED_RESULT; | 71 Event* Pre() WARN_UNUSED_RESULT; |
72 void Post(Event* event, bool result); | 72 void Post(Event* event, bool result); |
73 | 73 |
74 Mutex* mutex() { return &mutex_; } | 74 Mutex* mutex() { return &mutex_; } |
75 Event* waitlist() { return waitlist_; } | 75 Event* waitlist() { return waitlist_; } |
76 | 76 |
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109 // } | 109 // } |
110 typedef LazyStaticInstance< | 110 typedef LazyStaticInstance< |
111 ConditionVariable, DefaultConstructTrait<ConditionVariable>, | 111 ConditionVariable, DefaultConstructTrait<ConditionVariable>, |
112 ThreadSafeInitOnceTrait>::type LazyConditionVariable; | 112 ThreadSafeInitOnceTrait>::type LazyConditionVariable; |
113 | 113 |
114 #define LAZY_CONDITION_VARIABLE_INITIALIZER LAZY_STATIC_INSTANCE_INITIALIZER | 114 #define LAZY_CONDITION_VARIABLE_INITIALIZER LAZY_STATIC_INSTANCE_INITIALIZER |
115 | 115 |
116 } } // namespace v8::base | 116 } } // namespace v8::base |
117 | 117 |
118 #endif // V8_BASE_PLATFORM_CONDITION_VARIABLE_H_ | 118 #endif // V8_BASE_PLATFORM_CONDITION_VARIABLE_H_ |
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