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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 #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 #pragma once | 7 #pragma once | 
| 8 | 8 | 
| 9 #include "base/base_export.h" | 9 #include "base/base_export.h" | 
| 10 #include "base/callback_forward.h" | 10 #include "base/callback_forward.h" | 
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| 24 // for the worker pool threads to finish on shutdown, so the tasks running | 24 // for the worker pool threads to finish on shutdown, so the tasks running | 
| 25 // inside the pool must be extremely careful about other objects they access | 25 // inside the pool must be extremely careful about other objects they access | 
| 26 // (MessageLoops, Singletons, etc). During shutdown these object may no longer | 26 // (MessageLoops, Singletons, etc). During shutdown these object may no longer | 
| 27 // exist. | 27 // exist. | 
| 28 class BASE_EXPORT WorkerPool { | 28 class BASE_EXPORT WorkerPool { | 
| 29  public: | 29  public: | 
| 30   // This function posts |task| to run on a worker thread.  |task_is_slow| | 30   // This function posts |task| to run on a worker thread.  |task_is_slow| | 
| 31   // should be used for tasks that will take a long time to execute.  Returns | 31   // should be used for tasks that will take a long time to execute.  Returns | 
| 32   // false if |task| could not be posted to a worker thread.  Regardless of | 32   // false if |task| could not be posted to a worker thread.  Regardless of | 
| 33   // return value, ownership of |task| is transferred to the worker pool. | 33   // return value, ownership of |task| is transferred to the worker pool. | 
| 34   // |  | 
| 35   // TODO(ajwong): Remove the Task* based overload once we've finished the |  | 
| 36   // Task -> Closure migration. |  | 
| 37   static bool PostTask(const tracked_objects::Location& from_here, |  | 
| 38                        Task* task, bool task_is_slow); |  | 
| 39   static bool PostTask(const tracked_objects::Location& from_here, | 34   static bool PostTask(const tracked_objects::Location& from_here, | 
| 40                        const base::Closure& task, bool task_is_slow); | 35                        const base::Closure& task, bool task_is_slow); | 
| 41 | 36 | 
| 42   // Just like MessageLoopProxy::PostTaskAndReply, except the destination | 37   // Just like MessageLoopProxy::PostTaskAndReply, except the destination | 
| 43   // for |task| is a worker thread and you can specify |task_is_slow| just | 38   // for |task| is a worker thread and you can specify |task_is_slow| just | 
| 44   // like you can for PostTask above. | 39   // like you can for PostTask above. | 
| 45   static bool PostTaskAndReply(const tracked_objects::Location& from_here, | 40   static bool PostTaskAndReply(const tracked_objects::Location& from_here, | 
| 46                                const Closure& task, | 41                                const Closure& task, | 
| 47                                const Closure& reply, | 42                                const Closure& reply, | 
| 48                                bool task_is_slow); | 43                                bool task_is_slow); | 
| 49 }; | 44 }; | 
| 50 | 45 | 
| 51 }  // namespace base | 46 }  // namespace base | 
| 52 | 47 | 
| 53 #endif  // BASE_THREADING_WORKER_POOL_H_ | 48 #endif  // BASE_THREADING_WORKER_POOL_H_ | 
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