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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 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 <algorithm> | 5 #include <algorithm> |
6 #include <vector> | 6 #include <vector> |
7 | 7 |
8 #include "base/logging.h" | 8 #include "base/logging.h" |
9 #include "base/synchronization/waitable_event.h" | 9 #include "base/synchronization/waitable_event.h" |
10 #include "base/synchronization/condition_variable.h" | 10 #include "base/synchronization/condition_variable.h" |
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84 // ----------------------------------------------------------------------------- | 84 // ----------------------------------------------------------------------------- |
85 class SyncWaiter : public WaitableEvent::Waiter { | 85 class SyncWaiter : public WaitableEvent::Waiter { |
86 public: | 86 public: |
87 SyncWaiter() | 87 SyncWaiter() |
88 : fired_(false), | 88 : fired_(false), |
89 signaling_event_(NULL), | 89 signaling_event_(NULL), |
90 lock_(), | 90 lock_(), |
91 cv_(&lock_) { | 91 cv_(&lock_) { |
92 } | 92 } |
93 | 93 |
94 virtual bool Fire(WaitableEvent* signaling_event) OVERRIDE { | 94 virtual bool Fire(WaitableEvent* signaling_event) override { |
95 base::AutoLock locked(lock_); | 95 base::AutoLock locked(lock_); |
96 | 96 |
97 if (fired_) | 97 if (fired_) |
98 return false; | 98 return false; |
99 | 99 |
100 fired_ = true; | 100 fired_ = true; |
101 signaling_event_ = signaling_event; | 101 signaling_event_ = signaling_event; |
102 | 102 |
103 cv_.Broadcast(); | 103 cv_.Broadcast(); |
104 | 104 |
105 // Unlike AsyncWaiter objects, SyncWaiter objects are stack-allocated on | 105 // Unlike AsyncWaiter objects, SyncWaiter objects are stack-allocated on |
106 // the blocking thread's stack. There is no |delete this;| in Fire. The | 106 // the blocking thread's stack. There is no |delete this;| in Fire. The |
107 // SyncWaiter object is destroyed when it goes out of scope. | 107 // SyncWaiter object is destroyed when it goes out of scope. |
108 | 108 |
109 return true; | 109 return true; |
110 } | 110 } |
111 | 111 |
112 WaitableEvent* signaling_event() const { | 112 WaitableEvent* signaling_event() const { |
113 return signaling_event_; | 113 return signaling_event_; |
114 } | 114 } |
115 | 115 |
116 // --------------------------------------------------------------------------- | 116 // --------------------------------------------------------------------------- |
117 // These waiters are always stack allocated and don't delete themselves. Thus | 117 // These waiters are always stack allocated and don't delete themselves. Thus |
118 // there's no problem and the ABA tag is the same as the object pointer. | 118 // there's no problem and the ABA tag is the same as the object pointer. |
119 // --------------------------------------------------------------------------- | 119 // --------------------------------------------------------------------------- |
120 virtual bool Compare(void* tag) OVERRIDE { | 120 virtual bool Compare(void* tag) override { |
121 return this == tag; | 121 return this == tag; |
122 } | 122 } |
123 | 123 |
124 // --------------------------------------------------------------------------- | 124 // --------------------------------------------------------------------------- |
125 // Called with lock held. | 125 // Called with lock held. |
126 // --------------------------------------------------------------------------- | 126 // --------------------------------------------------------------------------- |
127 bool fired() const { | 127 bool fired() const { |
128 return fired_; | 128 return fired_; |
129 } | 129 } |
130 | 130 |
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408 return true; | 408 return true; |
409 } | 409 } |
410 } | 410 } |
411 | 411 |
412 return false; | 412 return false; |
413 } | 413 } |
414 | 414 |
415 // ----------------------------------------------------------------------------- | 415 // ----------------------------------------------------------------------------- |
416 | 416 |
417 } // namespace base | 417 } // namespace base |
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