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