OLD | NEW |
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 |
(...skipping 41 matching lines...) Expand 10 before | Expand all | Expand 10 after Loading... |
52 // All worker threads will share the same |name_prefix|. They will exit after | 52 // All worker threads will share the same |name_prefix|. They will exit after |
53 // |idle_seconds_before_exit|. | 53 // |idle_seconds_before_exit|. |
54 PosixDynamicThreadPool(const std::string& name_prefix, | 54 PosixDynamicThreadPool(const std::string& name_prefix, |
55 int idle_seconds_before_exit); | 55 int idle_seconds_before_exit); |
56 ~PosixDynamicThreadPool(); | 56 ~PosixDynamicThreadPool(); |
57 | 57 |
58 // Indicates that the thread pool is going away. Stops handing out tasks to | 58 // Indicates that the thread pool is going away. Stops handing out tasks to |
59 // worker threads. Wakes up all the idle threads to let them exit. | 59 // worker threads. Wakes up all the idle threads to let them exit. |
60 void Terminate(); | 60 void Terminate(); |
61 | 61 |
62 // Adds |task| to the thread pool. PosixDynamicThreadPool assumes ownership | |
63 // of |task|. | |
64 // | |
65 // TODO(ajwong): Remove this compatibility API once the Task -> Closure | |
66 // migration is finished. | |
67 void PostTask(const tracked_objects::Location& from_here, Task* task); | |
68 | |
69 // Adds |task| to the thread pool. | 62 // Adds |task| to the thread pool. |
70 void PostTask(const tracked_objects::Location& from_here, | 63 void PostTask(const tracked_objects::Location& from_here, |
71 const Closure& task); | 64 const Closure& task); |
72 | 65 |
73 // Worker thread method to wait for up to |idle_seconds_before_exit| for more | 66 // Worker thread method to wait for up to |idle_seconds_before_exit| for more |
74 // work from the thread pool. Returns NULL if no work is available. | 67 // work from the thread pool. Returns NULL if no work is available. |
75 PendingTask WaitForTask(); | 68 PendingTask WaitForTask(); |
76 | 69 |
77 private: | 70 private: |
78 friend class PosixDynamicThreadPoolPeer; | 71 friend class PosixDynamicThreadPoolPeer; |
(...skipping 17 matching lines...) Expand all Loading... |
96 // 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 |
97 // NULL in non-test code. | 90 // NULL in non-test code. |
98 scoped_ptr<ConditionVariable> num_idle_threads_cv_; | 91 scoped_ptr<ConditionVariable> num_idle_threads_cv_; |
99 | 92 |
100 DISALLOW_COPY_AND_ASSIGN(PosixDynamicThreadPool); | 93 DISALLOW_COPY_AND_ASSIGN(PosixDynamicThreadPool); |
101 }; | 94 }; |
102 | 95 |
103 } // namespace base | 96 } // namespace base |
104 | 97 |
105 #endif // BASE_THREADING_WORKER_POOL_POSIX_H_ | 98 #endif // BASE_THREADING_WORKER_POOL_POSIX_H_ |
OLD | NEW |