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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 #ifndef BASE_THREADING_WORKER_POOL_H_ | 5 #ifndef BASE_THREADING_WORKER_POOL_H_ |
6 #define BASE_THREADING_WORKER_POOL_H_ | 6 #define BASE_THREADING_WORKER_POOL_H_ |
7 | 7 |
8 #include "base/base_export.h" | 8 #include "base/base_export.h" |
9 #include "base/callback_forward.h" | 9 #include "base/callback_forward.h" |
10 #include "base/memory/ref_counted.h" | 10 #include "base/memory/ref_counted.h" |
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29 // exist. | 29 // exist. |
30 class BASE_EXPORT WorkerPool { | 30 class BASE_EXPORT WorkerPool { |
31 public: | 31 public: |
32 // This function posts |task| to run on a worker thread. |task_is_slow| | 32 // This function posts |task| to run on a worker thread. |task_is_slow| |
33 // should be used for tasks that will take a long time to execute. Returns | 33 // should be used for tasks that will take a long time to execute. Returns |
34 // false if |task| could not be posted to a worker thread. Regardless of | 34 // false if |task| could not be posted to a worker thread. Regardless of |
35 // return value, ownership of |task| is transferred to the worker pool. | 35 // return value, ownership of |task| is transferred to the worker pool. |
36 static bool PostTask(const tracked_objects::Location& from_here, | 36 static bool PostTask(const tracked_objects::Location& from_here, |
37 const base::Closure& task, bool task_is_slow); | 37 const base::Closure& task, bool task_is_slow); |
38 | 38 |
39 // Just like MessageLoopProxy::PostTaskAndReply, except the destination | 39 // Just like TaskRunner::PostTaskAndReply, except the destination |
40 // for |task| is a worker thread and you can specify |task_is_slow| just | 40 // for |task| is a worker thread and you can specify |task_is_slow| just |
41 // like you can for PostTask above. | 41 // like you can for PostTask above. |
42 static bool PostTaskAndReply(const tracked_objects::Location& from_here, | 42 static bool PostTaskAndReply(const tracked_objects::Location& from_here, |
43 const Closure& task, | 43 const Closure& task, |
44 const Closure& reply, | 44 const Closure& reply, |
45 bool task_is_slow); | 45 bool task_is_slow); |
46 | 46 |
47 // Return true if the current thread is one that this WorkerPool runs tasks | 47 // Return true if the current thread is one that this WorkerPool runs tasks |
48 // on. (Note that if the Windows worker pool is used without going through | 48 // on. (Note that if the Windows worker pool is used without going through |
49 // this WorkerPool interface, RunsTasksOnCurrentThread would return false on | 49 // this WorkerPool interface, RunsTasksOnCurrentThread would return false on |
50 // those threads.) | 50 // those threads.) |
51 static bool RunsTasksOnCurrentThread(); | 51 static bool RunsTasksOnCurrentThread(); |
52 | 52 |
53 // Get a TaskRunner wrapper which posts to the WorkerPool using the given | 53 // Get a TaskRunner wrapper which posts to the WorkerPool using the given |
54 // |task_is_slow| behavior. | 54 // |task_is_slow| behavior. |
55 static const scoped_refptr<TaskRunner>& GetTaskRunner(bool task_is_slow); | 55 static const scoped_refptr<TaskRunner>& GetTaskRunner(bool task_is_slow); |
56 }; | 56 }; |
57 | 57 |
58 } // namespace base | 58 } // namespace base |
59 | 59 |
60 #endif // BASE_THREADING_WORKER_POOL_H_ | 60 #endif // BASE_THREADING_WORKER_POOL_H_ |
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