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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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46 class BASE_EXPORT PosixDynamicThreadPool | 46 class BASE_EXPORT PosixDynamicThreadPool |
47 : public RefCountedThreadSafe<PosixDynamicThreadPool> { | 47 : public RefCountedThreadSafe<PosixDynamicThreadPool> { |
48 public: | 48 public: |
49 class PosixDynamicThreadPoolPeer; | 49 class PosixDynamicThreadPoolPeer; |
50 | 50 |
51 struct PendingTask { | 51 struct PendingTask { |
52 PendingTask(const tracked_objects::Location& posted_from, | 52 PendingTask(const tracked_objects::Location& posted_from, |
53 const base::Closure& task); | 53 const base::Closure& task); |
54 ~PendingTask(); | 54 ~PendingTask(); |
55 | 55 |
56 #if defined(TRACK_ALL_TASK_OBJECTS) | |
57 // Counter for location where the Closure was posted from. | 56 // Counter for location where the Closure was posted from. |
58 tracked_objects::Births* post_births; | 57 tracked_objects::Births* birth_tally; |
59 | 58 |
60 // Time the task was posted. | 59 // Time the task was posted. |
61 TimeTicks time_posted; | 60 tracked_objects::TrackedTime time_posted; |
62 #endif // defined(TRACK_ALL_TASK_OBJECTS) | |
63 | 61 |
64 const tracked_objects::Location posted_from; | 62 const tracked_objects::Location posted_from; |
65 | 63 |
66 // The task to run. | 64 // The task to run. |
67 base::Closure task; | 65 base::Closure task; |
68 }; | 66 }; |
69 | 67 |
70 // All worker threads will share the same |name_prefix|. They will exit after | 68 // All worker threads will share the same |name_prefix|. They will exit after |
71 // |idle_seconds_before_exit|. | 69 // |idle_seconds_before_exit|. |
72 PosixDynamicThreadPool(const std::string& name_prefix, | 70 PosixDynamicThreadPool(const std::string& name_prefix, |
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114 // Only used for tests to ensure correct thread ordering. It will always be | 112 // Only used for tests to ensure correct thread ordering. It will always be |
115 // NULL in non-test code. | 113 // NULL in non-test code. |
116 scoped_ptr<ConditionVariable> num_idle_threads_cv_; | 114 scoped_ptr<ConditionVariable> num_idle_threads_cv_; |
117 | 115 |
118 DISALLOW_COPY_AND_ASSIGN(PosixDynamicThreadPool); | 116 DISALLOW_COPY_AND_ASSIGN(PosixDynamicThreadPool); |
119 }; | 117 }; |
120 | 118 |
121 } // namespace base | 119 } // namespace base |
122 | 120 |
123 #endif // BASE_THREADING_WORKER_POOL_POSIX_H_ | 121 #endif // BASE_THREADING_WORKER_POOL_POSIX_H_ |
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