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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 <stack> | 7 #include <stack> |
8 | 8 |
9 #include "base/logging.h" | 9 #include "base/logging.h" |
10 #include "base/synchronization/lock.h" | 10 #include "base/synchronization/lock.h" |
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110 // objects as there are threads simultaneously using this instance's Wait() | 110 // objects as there are threads simultaneously using this instance's Wait() |
111 // functionality. | 111 // functionality. |
112 ConditionVariable::Event* ConditionVariable::GetEventForWaiting() { | 112 ConditionVariable::Event* ConditionVariable::GetEventForWaiting() { |
113 // We hold internal_lock, courtesy of Wait(). | 113 // We hold internal_lock, courtesy of Wait(). |
114 Event* cv_event; | 114 Event* cv_event; |
115 if (0 == recycling_list_size_) { | 115 if (0 == recycling_list_size_) { |
116 DCHECK(recycling_list_.IsEmpty()); | 116 DCHECK(recycling_list_.IsEmpty()); |
117 cv_event = new Event(); | 117 cv_event = new Event(); |
118 cv_event->InitListElement(); | 118 cv_event->InitListElement(); |
119 allocation_counter_++; | 119 allocation_counter_++; |
120 CHECK(cv_event->handle()); | 120 DCHECK(cv_event->handle()); |
121 } else { | 121 } else { |
122 cv_event = recycling_list_.PopFront(); | 122 cv_event = recycling_list_.PopFront(); |
123 recycling_list_size_--; | 123 recycling_list_size_--; |
124 } | 124 } |
125 waiting_list_.PushBack(cv_event); | 125 waiting_list_.PushBack(cv_event); |
126 return cv_event; | 126 return cv_event; |
127 } | 127 } |
128 | 128 |
129 // RecycleEvent() takes a cv_event that was previously used for Wait()ing, and | 129 // RecycleEvent() takes a cv_event that was previously used for Wait()ing, and |
130 // recycles it for use in future Wait() calls for this or other threads. | 130 // recycles it for use in future Wait() calls for this or other threads. |
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186 if (0 != handle_) { | 186 if (0 != handle_) { |
187 int ret_val = CloseHandle(handle_); | 187 int ret_val = CloseHandle(handle_); |
188 DCHECK(ret_val); | 188 DCHECK(ret_val); |
189 } | 189 } |
190 } | 190 } |
191 | 191 |
192 // Change a container instance permanently into an element of a list. | 192 // Change a container instance permanently into an element of a list. |
193 void ConditionVariable::Event::InitListElement() { | 193 void ConditionVariable::Event::InitListElement() { |
194 DCHECK(!handle_); | 194 DCHECK(!handle_); |
195 handle_ = CreateEvent(NULL, false, false, NULL); | 195 handle_ = CreateEvent(NULL, false, false, NULL); |
196 CHECK(handle_); | 196 DCHECK(handle_); |
197 } | 197 } |
198 | 198 |
199 // Methods for use on lists. | 199 // Methods for use on lists. |
200 bool ConditionVariable::Event::IsEmpty() const { | 200 bool ConditionVariable::Event::IsEmpty() const { |
201 DCHECK(ValidateAsList()); | 201 DCHECK(ValidateAsList()); |
202 return IsSingleton(); | 202 return IsSingleton(); |
203 } | 203 } |
204 | 204 |
205 void ConditionVariable::Event::PushBack(Event* other) { | 205 void ConditionVariable::Event::PushBack(Event* other) { |
206 DCHECK(ValidateAsList()); | 206 DCHECK(ValidateAsList()); |
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438 provided O(1) performance in all required operations. Since other operations | 438 provided O(1) performance in all required operations. Since other operations |
439 to provide performance-and/or-fairness required queue (FIFO) and list (LIFO) | 439 to provide performance-and/or-fairness required queue (FIFO) and list (LIFO) |
440 containers, I would also have needed to use an STL list/queue as well as an STL | 440 containers, I would also have needed to use an STL list/queue as well as an STL |
441 map. In the end I decided it would be "fun" to just do it right, and I | 441 map. In the end I decided it would be "fun" to just do it right, and I |
442 put so many assertions (DCHECKs) into the container class that it is trivial to | 442 put so many assertions (DCHECKs) into the container class that it is trivial to |
443 code review and validate its correctness. | 443 code review and validate its correctness. |
444 | 444 |
445 */ | 445 */ |
446 | 446 |
447 } // namespace base | 447 } // namespace base |
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