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1 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2006-2008 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_CONDITION_VARIABLE_H_ | 65 #ifndef BASE_CONDITION_VARIABLE_H_ |
66 #define BASE_CONDITION_VARIABLE_H_ | 66 #define BASE_CONDITION_VARIABLE_H_ |
67 | 67 |
| 68 #include "build/build_config.h" |
| 69 |
| 70 #if defined(OS_WIN) |
| 71 #include <windows.h> |
| 72 #elif defined(OS_POSIX) |
| 73 #include <pthread.h> |
| 74 #endif |
| 75 |
| 76 #include "base/basictypes.h" |
68 #include "base/lock.h" | 77 #include "base/lock.h" |
69 | 78 |
70 namespace base { | 79 namespace base { |
71 class TimeDelta; | 80 class TimeDelta; |
72 } | 81 } |
73 | 82 |
74 class ConditionVariable { | 83 class ConditionVariable { |
75 public: | 84 public: |
76 // Construct a cv for use with ONLY one user lock. | 85 // Construct a cv for use with ONLY one user lock. |
77 explicit ConditionVariable(Lock* user_lock); | 86 explicit ConditionVariable(Lock* user_lock); |
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165 | 174 |
166 pthread_cond_t condition_; | 175 pthread_cond_t condition_; |
167 pthread_mutex_t* user_mutex_; | 176 pthread_mutex_t* user_mutex_; |
168 | 177 |
169 #endif | 178 #endif |
170 | 179 |
171 DISALLOW_COPY_AND_ASSIGN(ConditionVariable); | 180 DISALLOW_COPY_AND_ASSIGN(ConditionVariable); |
172 }; | 181 }; |
173 | 182 |
174 #endif // BASE_CONDITION_VARIABLE_H_ | 183 #endif // BASE_CONDITION_VARIABLE_H_ |
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