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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_SEQUENCED_WORKER_POOL_TASK_RUNNER_H_ | |
| 6 #define BASE_THREADING_SEQUENCED_WORKER_POOL_TASK_RUNNER_H_ | |
| 7 #pragma once | |
| 8 | |
| 9 #include "base/basictypes.h" | |
| 10 #include "base/callback_forward.h" | |
| 11 #include "base/compiler_specific.h" | |
| 12 #include "base/memory/ref_counted.h" | |
| 13 #include "base/sequenced_task_runner.h" | |
| 14 #include "base/threading/sequenced_worker_pool.h" | |
| 15 #include "base/time.h" | |
| 16 | |
| 17 namespace tracked_objects { | |
| 18 class Location; | |
| 19 } // namespace tracked_objects | |
| 20 | |
| 21 namespace base { | |
| 22 | |
| 23 // A SequencedTaskRunner which posts tasks to a SequencedWorkerPool with a | |
| 24 // fixed sequence token. | |
| 25 // | |
| 26 // Note that this class is RefCountedThreadSafe (inherited from TaskRunner). | |
| 27 class BASE_EXPORT SequencedWorkerPoolTaskRunner : public SequencedTaskRunner { | |
| 28 public: | |
| 29 SequencedWorkerPoolTaskRunner(const scoped_refptr<SequencedWorkerPool>& pool, | |
| 30 SequencedWorkerPool::SequenceToken token); | |
| 31 | |
| 32 // TaskRunner implementation | |
| 33 virtual bool PostDelayedTask(const tracked_objects::Location& from_here, | |
| 34 const Closure& task, | |
| 35 int64 delay_ms) OVERRIDE; | |
| 36 virtual bool PostDelayedTask(const tracked_objects::Location& from_here, | |
| 37 const Closure& task, | |
| 38 TimeDelta delay) OVERRIDE; | |
| 39 virtual bool RunsTasksOnCurrentThread() const OVERRIDE; | |
| 40 | |
| 41 // SequencedTaskRunner implementation | |
| 42 virtual bool PostNonNestableDelayedTask( | |
| 43 const tracked_objects::Location& from_here, | |
| 44 const Closure& task, | |
| 45 int64 delay_ms) OVERRIDE; | |
| 46 virtual bool PostNonNestableDelayedTask( | |
| 47 const tracked_objects::Location& from_here, | |
| 48 const Closure& task, | |
| 49 TimeDelta delay) OVERRIDE; | |
| 50 | |
| 51 private: | |
| 52 virtual ~SequencedWorkerPoolTaskRunner(); | |
| 53 | |
| 54 // Helper function for posting a delayed task. Asserts that the delay is | |
| 55 // zero because non-zero delays are not yet supported. | |
| 56 bool PostDelayedTaskAssertZeroDelay( | |
| 57 const tracked_objects::Location& from_here, | |
| 58 const Closure& task, | |
| 59 int64 delay_ms); | |
| 60 bool PostDelayedTaskAssertZeroDelay( | |
| 61 const tracked_objects::Location& from_here, | |
| 62 const Closure& task, | |
| 63 TimeDelta delay); | |
| 64 | |
| 65 const scoped_refptr<SequencedWorkerPool> pool_; | |
| 66 | |
| 67 const SequencedWorkerPool::SequenceToken token_; | |
| 68 | |
| 69 DISALLOW_COPY_AND_ASSIGN(SequencedWorkerPoolTaskRunner); | |
| 70 }; | |
| 71 | |
| 72 } // namespace base | |
| 73 | |
| 74 #endif // BASE_THREADING_SEQUENCED_TASK_RUNNER_IMPL_H_ | |
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