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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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44 : public RefCountedThreadSafe<PosixDynamicThreadPool> { | 44 : public RefCountedThreadSafe<PosixDynamicThreadPool> { |
45 public: | 45 public: |
46 class PosixDynamicThreadPoolPeer; | 46 class PosixDynamicThreadPoolPeer; |
47 | 47 |
48 // All worker threads will share the same |name_prefix|. They will exit after | 48 // All worker threads will share the same |name_prefix|. They will exit after |
49 // |idle_seconds_before_exit|. | 49 // |idle_seconds_before_exit|. |
50 PosixDynamicThreadPool(const std::string& name_prefix, | 50 PosixDynamicThreadPool(const std::string& name_prefix, |
51 int idle_seconds_before_exit); | 51 int idle_seconds_before_exit); |
52 | 52 |
53 // Adds |task| to the thread pool. | 53 // Adds |task| to the thread pool. |
54 void PostTask(const tracked_objects::Location& from_here, Closure task); | 54 void PostTask(const tracked_objects::Location& from_here, OnceClosure task); |
55 | 55 |
56 // Worker thread method to wait for up to |idle_seconds_before_exit| for more | 56 // Worker thread method to wait for up to |idle_seconds_before_exit| for more |
57 // work from the thread pool. Returns NULL if no work is available. | 57 // work from the thread pool. Returns NULL if no work is available. |
58 PendingTask WaitForTask(); | 58 PendingTask WaitForTask(); |
59 | 59 |
60 private: | 60 private: |
61 friend class RefCountedThreadSafe<PosixDynamicThreadPool>; | 61 friend class RefCountedThreadSafe<PosixDynamicThreadPool>; |
62 friend class PosixDynamicThreadPoolPeer; | 62 friend class PosixDynamicThreadPoolPeer; |
63 | 63 |
64 ~PosixDynamicThreadPool(); | 64 ~PosixDynamicThreadPool(); |
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81 // Only used for tests to ensure correct thread ordering. It will always be | 81 // Only used for tests to ensure correct thread ordering. It will always be |
82 // NULL in non-test code. | 82 // NULL in non-test code. |
83 std::unique_ptr<ConditionVariable> num_idle_threads_cv_; | 83 std::unique_ptr<ConditionVariable> num_idle_threads_cv_; |
84 | 84 |
85 DISALLOW_COPY_AND_ASSIGN(PosixDynamicThreadPool); | 85 DISALLOW_COPY_AND_ASSIGN(PosixDynamicThreadPool); |
86 }; | 86 }; |
87 | 87 |
88 } // namespace base | 88 } // namespace base |
89 | 89 |
90 #endif // BASE_THREADING_WORKER_POOL_POSIX_H_ | 90 #endif // BASE_THREADING_WORKER_POOL_POSIX_H_ |
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