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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 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 // The thread pool used in the POSIX implementation of WorkerPool dynamically | 5 // The thread pool used in the POSIX implementation of WorkerPool dynamically |
6 // adds threads as necessary to handle all tasks. It keeps old threads around | 6 // adds threads as necessary to handle all tasks. It keeps old threads around |
7 // for a period of time to allow them to be reused. After this waiting period, | 7 // for a period of time to allow them to be reused. After this waiting period, |
8 // the threads exit. This thread pool uses non-joinable threads, therefore | 8 // the threads exit. This thread pool uses non-joinable threads, therefore |
9 // worker threads are not joined during process shutdown. This means that | 9 // worker threads are not joined during process shutdown. This means that |
10 // potentially long running tasks (such as DNS lookup) do not block process | 10 // potentially long running tasks (such as DNS lookup) do not block process |
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23 | 23 |
24 #ifndef BASE_THREADING_WORKER_POOL_POSIX_H_ | 24 #ifndef BASE_THREADING_WORKER_POOL_POSIX_H_ |
25 #define BASE_THREADING_WORKER_POOL_POSIX_H_ | 25 #define BASE_THREADING_WORKER_POOL_POSIX_H_ |
26 | 26 |
27 #include <queue> | 27 #include <queue> |
28 #include <string> | 28 #include <string> |
29 | 29 |
30 #include "base/basictypes.h" | 30 #include "base/basictypes.h" |
31 #include "base/callback_forward.h" | 31 #include "base/callback_forward.h" |
32 #include "base/location.h" | 32 #include "base/location.h" |
33 #include "base/time.h" | |
34 #include "base/memory/ref_counted.h" | 33 #include "base/memory/ref_counted.h" |
35 #include "base/memory/scoped_ptr.h" | 34 #include "base/memory/scoped_ptr.h" |
36 #include "base/pending_task.h" | 35 #include "base/pending_task.h" |
37 #include "base/synchronization/condition_variable.h" | 36 #include "base/synchronization/condition_variable.h" |
38 #include "base/synchronization/lock.h" | 37 #include "base/synchronization/lock.h" |
39 #include "base/threading/platform_thread.h" | 38 #include "base/threading/platform_thread.h" |
40 #include "base/tracked_objects.h" | 39 #include "base/tracked_objects.h" |
41 | 40 |
42 class Task; | 41 class Task; |
43 | 42 |
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90 // Only used for tests to ensure correct thread ordering. It will always be | 89 // Only used for tests to ensure correct thread ordering. It will always be |
91 // NULL in non-test code. | 90 // NULL in non-test code. |
92 scoped_ptr<ConditionVariable> num_idle_threads_cv_; | 91 scoped_ptr<ConditionVariable> num_idle_threads_cv_; |
93 | 92 |
94 DISALLOW_COPY_AND_ASSIGN(PosixDynamicThreadPool); | 93 DISALLOW_COPY_AND_ASSIGN(PosixDynamicThreadPool); |
95 }; | 94 }; |
96 | 95 |
97 } // namespace base | 96 } // namespace base |
98 | 97 |
99 #endif // BASE_THREADING_WORKER_POOL_POSIX_H_ | 98 #endif // BASE_THREADING_WORKER_POOL_POSIX_H_ |
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