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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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