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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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58 // thread that has Wait()ed the longest is selected. The default policy | 58 // thread that has Wait()ed the longest is selected. The default policy |
59 // may improve performance, as the selected thread may have a greater chance of | 59 // may improve performance, as the selected thread may have a greater chance of |
60 // having some of its stack data in various CPU caches. | 60 // having some of its stack data in various CPU caches. |
61 // | 61 // |
62 // For a discussion of the many very subtle implementation details, see the FAQ | 62 // For a discussion of the many very subtle implementation details, see the FAQ |
63 // at the end of condition_variable_win.cc. | 63 // at the end of condition_variable_win.cc. |
64 | 64 |
65 #ifndef BASE_SYNCHRONIZATION_CONDITION_VARIABLE_H_ | 65 #ifndef BASE_SYNCHRONIZATION_CONDITION_VARIABLE_H_ |
66 #define BASE_SYNCHRONIZATION_CONDITION_VARIABLE_H_ | 66 #define BASE_SYNCHRONIZATION_CONDITION_VARIABLE_H_ |
67 | 67 |
| 68 #include "base/base_export.h" |
| 69 #include "base/logging.h" |
| 70 #include "base/macros.h" |
| 71 #include "base/synchronization/lock.h" |
68 #include "build/build_config.h" | 72 #include "build/build_config.h" |
69 | 73 |
70 #if defined(OS_POSIX) | 74 #if defined(OS_POSIX) |
71 #include <pthread.h> | 75 #include <pthread.h> |
72 #endif | 76 #endif |
73 | 77 |
74 #include "base/base_export.h" | |
75 #include "base/basictypes.h" | |
76 #include "base/logging.h" | |
77 #include "base/synchronization/lock.h" | |
78 | |
79 namespace base { | 78 namespace base { |
80 | 79 |
81 class ConditionVarImpl; | 80 class ConditionVarImpl; |
82 class TimeDelta; | 81 class TimeDelta; |
83 | 82 |
84 class BASE_EXPORT ConditionVariable { | 83 class BASE_EXPORT ConditionVariable { |
85 public: | 84 public: |
86 // Construct a cv for use with ONLY one user lock. | 85 // Construct a cv for use with ONLY one user lock. |
87 explicit ConditionVariable(Lock* user_lock); | 86 explicit ConditionVariable(Lock* user_lock); |
88 | 87 |
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110 #endif | 109 #endif |
111 | 110 |
112 #endif | 111 #endif |
113 | 112 |
114 DISALLOW_COPY_AND_ASSIGN(ConditionVariable); | 113 DISALLOW_COPY_AND_ASSIGN(ConditionVariable); |
115 }; | 114 }; |
116 | 115 |
117 } // namespace base | 116 } // namespace base |
118 | 117 |
119 #endif // BASE_SYNCHRONIZATION_CONDITION_VARIABLE_H_ | 118 #endif // BASE_SYNCHRONIZATION_CONDITION_VARIABLE_H_ |
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