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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 // 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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32 #include "base/memory/ref_counted.h" | 32 #include "base/memory/ref_counted.h" |
33 #include "base/memory/scoped_ptr.h" | 33 #include "base/memory/scoped_ptr.h" |
34 #include "base/synchronization/condition_variable.h" | 34 #include "base/synchronization/condition_variable.h" |
35 #include "base/synchronization/lock.h" | 35 #include "base/synchronization/lock.h" |
36 #include "base/threading/platform_thread.h" | 36 #include "base/threading/platform_thread.h" |
37 | 37 |
38 class Task; | 38 class Task; |
39 | 39 |
40 namespace base { | 40 namespace base { |
41 | 41 |
42 class PosixDynamicThreadPool | 42 class BASE_API PosixDynamicThreadPool |
43 : public RefCountedThreadSafe<PosixDynamicThreadPool> { | 43 : public RefCountedThreadSafe<PosixDynamicThreadPool> { |
44 public: | 44 public: |
45 class PosixDynamicThreadPoolPeer; | 45 class PosixDynamicThreadPoolPeer; |
46 | 46 |
47 // All worker threads will share the same |name_prefix|. They will exit after | 47 // All worker threads will share the same |name_prefix|. They will exit after |
48 // |idle_seconds_before_exit|. | 48 // |idle_seconds_before_exit|. |
49 PosixDynamicThreadPool(const std::string& name_prefix, | 49 PosixDynamicThreadPool(const std::string& name_prefix, |
50 int idle_seconds_before_exit); | 50 int idle_seconds_before_exit); |
51 ~PosixDynamicThreadPool(); | 51 ~PosixDynamicThreadPool(); |
52 | 52 |
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80 // Only used for tests to ensure correct thread ordering. It will always be | 80 // Only used for tests to ensure correct thread ordering. It will always be |
81 // NULL in non-test code. | 81 // NULL in non-test code. |
82 scoped_ptr<ConditionVariable> num_idle_threads_cv_; | 82 scoped_ptr<ConditionVariable> num_idle_threads_cv_; |
83 | 83 |
84 DISALLOW_COPY_AND_ASSIGN(PosixDynamicThreadPool); | 84 DISALLOW_COPY_AND_ASSIGN(PosixDynamicThreadPool); |
85 }; | 85 }; |
86 | 86 |
87 } // namespace base | 87 } // namespace base |
88 | 88 |
89 #endif // BASE_THREADING_WORKER_POOL_POSIX_H_ | 89 #endif // BASE_THREADING_WORKER_POOL_POSIX_H_ |
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