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Side by Side Diff: base/synchronization/condition_variable.h

Issue 6142009: Upating the app, ceee, chrome, ipc, media, and net directories to use the correct lock.h file. (Closed) Base URL: http://git.chromium.org/git/chromium.git@trunk
Patch Set: Unified patch updating all references to the new base/synchronization/lock.h Created 9 years, 11 months ago
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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 // ConditionVariable wraps pthreads condition variable synchronization or, on 5 // ConditionVariable wraps pthreads condition variable synchronization or, on
6 // Windows, simulates it. This functionality is very helpful for having 6 // Windows, simulates it. This functionality is very helpful for having
7 // several threads wait for an event, as is common with a thread pool managed 7 // several threads wait for an event, as is common with a thread pool managed
8 // by a master. The meaning of such an event in the (worker) thread pool 8 // by a master. The meaning of such an event in the (worker) thread pool
9 // scenario is that additional tasks are now available for processing. It is 9 // scenario is that additional tasks are now available for processing. It is
10 // used in Chrome in the DNS prefetching system to notify worker threads that 10 // used in Chrome in the DNS prefetching system to notify worker threads that
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68 68
69 #include "build/build_config.h" 69 #include "build/build_config.h"
70 70
71 #if defined(OS_WIN) 71 #if defined(OS_WIN)
72 #include <windows.h> 72 #include <windows.h>
73 #elif defined(OS_POSIX) 73 #elif defined(OS_POSIX)
74 #include <pthread.h> 74 #include <pthread.h>
75 #endif 75 #endif
76 76
77 #include "base/basictypes.h" 77 #include "base/basictypes.h"
78 #include "base/lock.h" 78 #include "base/synchronization/lock.h"
79 79
80 namespace base { 80 namespace base {
81 81
82 class TimeDelta; 82 class TimeDelta;
83 83
84 class ConditionVariable { 84 class ConditionVariable {
85 public: 85 public:
86 // Construct a cv for use with ONLY one user lock. 86 // Construct a cv for use with ONLY one user lock.
87 explicit ConditionVariable(Lock* user_lock); 87 explicit ConditionVariable(Lock* user_lock);
88 88
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149 // This helps with defensive destructor coding in the face of user error. 149 // This helps with defensive destructor coding in the face of user error.
150 enum RunState { SHUTDOWN = 0, RUNNING = 64213 }; 150 enum RunState { SHUTDOWN = 0, RUNNING = 64213 };
151 151
152 // Internal implementation methods supporting Wait(). 152 // Internal implementation methods supporting Wait().
153 Event* GetEventForWaiting(); 153 Event* GetEventForWaiting();
154 void RecycleEvent(Event* used_event); 154 void RecycleEvent(Event* used_event);
155 155
156 RunState run_state_; 156 RunState run_state_;
157 157
158 // Private critical section for access to member data. 158 // Private critical section for access to member data.
159 Lock internal_lock_; 159 base::Lock internal_lock_;
160 160
161 // Lock that is acquired before calling Wait(). 161 // Lock that is acquired before calling Wait().
162 Lock& user_lock_; 162 base::Lock& user_lock_;
163 163
164 // Events that threads are blocked on. 164 // Events that threads are blocked on.
165 Event waiting_list_; 165 Event waiting_list_;
166 166
167 // Free list for old events. 167 // Free list for old events.
168 Event recycling_list_; 168 Event recycling_list_;
169 int recycling_list_size_; 169 int recycling_list_size_;
170 170
171 // The number of allocated, but not yet deleted events. 171 // The number of allocated, but not yet deleted events.
172 int allocation_counter_; 172 int allocation_counter_;
173 173
174 #elif defined(OS_POSIX) 174 #elif defined(OS_POSIX)
175 175
176 pthread_cond_t condition_; 176 pthread_cond_t condition_;
177 pthread_mutex_t* user_mutex_; 177 pthread_mutex_t* user_mutex_;
178 #if !defined(NDEBUG) 178 #if !defined(NDEBUG)
179 Lock* user_lock_; // Needed to adjust shadow lock state on wait. 179 base::Lock* user_lock_; // Needed to adjust shadow lock state on wait.
180 #endif 180 #endif
181 181
182 #endif 182 #endif
183 183
184 DISALLOW_COPY_AND_ASSIGN(ConditionVariable); 184 DISALLOW_COPY_AND_ASSIGN(ConditionVariable);
185 }; 185 };
186 186
187 } // namespace base 187 } // namespace base
188 188
189 #endif // BASE_SYNCHRONIZATION_CONDITION_VARIABLE_H_ 189 #endif // BASE_SYNCHRONIZATION_CONDITION_VARIABLE_H_
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