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

Issue 1538743002: Switch to standard integer types in base/. (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: DEPS roll too Created 4 years, 12 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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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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