OLD | NEW |
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 |
(...skipping 20 matching lines...) Expand all Loading... |
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/macros.h" | 33 #include "base/macros.h" |
34 #include "base/memory/ref_counted.h" | 34 #include "base/memory/ref_counted.h" |
35 #include "base/pending_task.h" | 35 #include "base/pending_task.h" |
36 #include "base/synchronization/condition_variable.h" | 36 #include "base/synchronization/condition_variable.h" |
37 #include "base/synchronization/lock.h" | 37 #include "base/synchronization/lock.h" |
38 #include "base/threading/platform_thread.h" | 38 #include "base/threading/platform_thread.h" |
39 #include "base/tracked_objects.h" | 39 #include "base/tracked_objects.h" |
40 | 40 |
41 class Task; | |
42 | |
43 namespace base { | 41 namespace base { |
44 | 42 |
45 class BASE_EXPORT PosixDynamicThreadPool | 43 class BASE_EXPORT PosixDynamicThreadPool |
46 : public RefCountedThreadSafe<PosixDynamicThreadPool> { | 44 : public RefCountedThreadSafe<PosixDynamicThreadPool> { |
47 public: | 45 public: |
48 class PosixDynamicThreadPoolPeer; | 46 class PosixDynamicThreadPoolPeer; |
49 | 47 |
50 // 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 |
51 // |idle_seconds_before_exit|. | 49 // |idle_seconds_before_exit|. |
52 PosixDynamicThreadPool(const std::string& name_prefix, | 50 PosixDynamicThreadPool(const std::string& name_prefix, |
(...skipping 36 matching lines...) Expand 10 before | Expand all | Expand 10 after Loading... |
89 // Only used for tests to ensure correct thread ordering. It will always be | 87 // Only used for tests to ensure correct thread ordering. It will always be |
90 // NULL in non-test code. | 88 // NULL in non-test code. |
91 std::unique_ptr<ConditionVariable> num_idle_threads_cv_; | 89 std::unique_ptr<ConditionVariable> num_idle_threads_cv_; |
92 | 90 |
93 DISALLOW_COPY_AND_ASSIGN(PosixDynamicThreadPool); | 91 DISALLOW_COPY_AND_ASSIGN(PosixDynamicThreadPool); |
94 }; | 92 }; |
95 | 93 |
96 } // namespace base | 94 } // namespace base |
97 | 95 |
98 #endif // BASE_THREADING_WORKER_POOL_POSIX_H_ | 96 #endif // BASE_THREADING_WORKER_POOL_POSIX_H_ |
OLD | NEW |