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Side by Side Diff: base/threading/worker_pool_posix.h

Issue 1550503002: Switch to standard integer types in base/threading/. (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Created 4 years, 12 months ago
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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
11 // shutdown, but also means that process shutdown may "leak" objects. Note that 11 // shutdown, but also means that process shutdown may "leak" objects. Note that
12 // although PosixDynamicThreadPool spawns the worker threads and manages the 12 // although PosixDynamicThreadPool spawns the worker threads and manages the
13 // task queue, it does not own the worker threads. The worker threads ask the 13 // task queue, it does not own the worker threads. The worker threads ask the
14 // PosixDynamicThreadPool for work and eventually clean themselves up. The 14 // PosixDynamicThreadPool for work and eventually clean themselves up. The
15 // worker threads all maintain scoped_refptrs to the PosixDynamicThreadPool 15 // worker threads all maintain scoped_refptrs to the PosixDynamicThreadPool
16 // instance, which prevents PosixDynamicThreadPool from disappearing before all 16 // instance, which prevents PosixDynamicThreadPool from disappearing before all
17 // worker threads exit. The owner of PosixDynamicThreadPool should likewise 17 // worker threads exit. The owner of PosixDynamicThreadPool should likewise
18 // maintain a scoped_refptr to the PosixDynamicThreadPool instance. 18 // maintain a scoped_refptr to the PosixDynamicThreadPool instance.
19 // 19 //
20 // NOTE: The classes defined in this file are only meant for use by the POSIX 20 // NOTE: The classes defined in this file are only meant for use by the POSIX
21 // implementation of WorkerPool. No one else should be using these classes. 21 // implementation of WorkerPool. No one else should be using these classes.
22 // These symbols are exported in a header purely for testing purposes. 22 // These symbols are exported in a header purely for testing purposes.
23 23
24 #ifndef BASE_THREADING_WORKER_POOL_POSIX_H_ 24 #ifndef BASE_THREADING_WORKER_POOL_POSIX_H_
25 #define BASE_THREADING_WORKER_POOL_POSIX_H_ 25 #define BASE_THREADING_WORKER_POOL_POSIX_H_
26 26
27 #include <queue> 27 #include <queue>
28 #include <string> 28 #include <string>
29 29
30 #include "base/basictypes.h"
31 #include "base/callback_forward.h" 30 #include "base/callback_forward.h"
32 #include "base/location.h" 31 #include "base/location.h"
32 #include "base/macros.h"
33 #include "base/memory/ref_counted.h" 33 #include "base/memory/ref_counted.h"
34 #include "base/memory/scoped_ptr.h" 34 #include "base/memory/scoped_ptr.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; 41 class Task;
42 42
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89 // 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
90 // NULL in non-test code. 90 // NULL in non-test code.
91 scoped_ptr<ConditionVariable> num_idle_threads_cv_; 91 scoped_ptr<ConditionVariable> num_idle_threads_cv_;
92 92
93 DISALLOW_COPY_AND_ASSIGN(PosixDynamicThreadPool); 93 DISALLOW_COPY_AND_ASSIGN(PosixDynamicThreadPool);
94 }; 94 };
95 95
96 } // namespace base 96 } // namespace base
97 97
98 #endif // BASE_THREADING_WORKER_POOL_POSIX_H_ 98 #endif // BASE_THREADING_WORKER_POOL_POSIX_H_
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