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| 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 | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #ifndef BASE_THREADING_WORKER_POOL_H_ | |
| 6 #define BASE_THREADING_WORKER_POOL_H_ | |
| 7 | |
| 8 #include "base/base_export.h" | |
| 9 #include "base/callback_forward.h" | |
| 10 #include "base/memory/ref_counted.h" | |
| 11 | |
| 12 class Task; | |
| 13 | |
| 14 namespace tracked_objects { | |
| 15 class Location; | |
| 16 } // namespace tracked_objects | |
| 17 | |
| 18 namespace base { | |
| 19 | |
| 20 class TaskRunner; | |
| 21 | |
| 22 // This is a facility that runs tasks that don't require a specific thread or | |
| 23 // a message loop. | |
| 24 // | |
| 25 // WARNING: This shouldn't be used unless absolutely necessary. We don't wait | |
| 26 // for the worker pool threads to finish on shutdown, so the tasks running | |
| 27 // inside the pool must be extremely careful about other objects they access | |
| 28 // (MessageLoops, Singletons, etc). During shutdown these object may no longer | |
| 29 // exist. | |
| 30 class BASE_EXPORT WorkerPool { | |
| 31 public: | |
| 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 | |
| 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. | |
| 36 static bool PostTask(const tracked_objects::Location& from_here, | |
| 37 const base::Closure& task, bool task_is_slow); | |
| 38 | |
| 39 // Just like TaskRunner::PostTaskAndReply, except the destination | |
| 40 // for |task| is a worker thread and you can specify |task_is_slow| just | |
| 41 // like you can for PostTask above. | |
| 42 static bool PostTaskAndReply(const tracked_objects::Location& from_here, | |
| 43 const Closure& task, | |
| 44 const Closure& reply, | |
| 45 bool task_is_slow); | |
| 46 | |
| 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 | |
| 49 // this WorkerPool interface, RunsTasksOnCurrentThread would return false on | |
| 50 // those threads.) | |
| 51 static bool RunsTasksOnCurrentThread(); | |
| 52 | |
| 53 // Get a TaskRunner wrapper which posts to the WorkerPool using the given | |
| 54 // |task_is_slow| behavior. | |
| 55 static const scoped_refptr<TaskRunner>& GetTaskRunner(bool task_is_slow); | |
| 56 }; | |
| 57 | |
| 58 } // namespace base | |
| 59 | |
| 60 #endif // BASE_THREADING_WORKER_POOL_H_ | |
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