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1 // Copyright 2015 The Chromium Authors. All rights reserved. | 1 // Copyright 2015 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_SEQUENCED_TASK_RUNNER_HANDLE_H_ | 5 #ifndef BASE_THREADING_SEQUENCED_TASK_RUNNER_HANDLE_H_ |
6 #define BASE_THREADING_SEQUENCED_TASK_RUNNER_HANDLE_H_ | 6 #define BASE_THREADING_SEQUENCED_TASK_RUNNER_HANDLE_H_ |
7 | 7 |
8 #include "base/compiler_specific.h" | 8 #include "base/compiler_specific.h" |
9 #include "base/memory/ref_counted.h" | 9 #include "base/memory/ref_counted.h" |
10 | 10 |
11 namespace base { | 11 namespace base { |
12 | 12 |
13 class SequencedTaskRunner; | 13 class SequencedTaskRunner; |
14 | 14 |
15 class BASE_EXPORT SequencedTaskRunnerHandle { | 15 class BASE_EXPORT SequencedTaskRunnerHandle { |
16 public: | 16 public: |
17 // Returns a SequencedTaskRunner which guarantees that posted tasks will only | 17 // Returns a SequencedTaskRunner which guarantees that posted tasks will only |
18 // run after the current task is finished and will satisfy a SequenceChecker. | 18 // run after the current task is finished and will satisfy a SequenceChecker. |
19 // It should only be called if IsSet() returns true (see the comment there for | 19 // It should only be called if IsSet() returns true (see the comment there for |
20 // the requirements). | 20 // the requirements). |
21 static scoped_refptr<SequencedTaskRunner> Get(); | 21 static scoped_refptr<SequencedTaskRunner> Get(); |
22 | 22 |
23 // Returns true if one of the following conditions is fulfilled: | 23 // Returns true if one of the following conditions is fulfilled: |
24 // a) The current thread has a ThreadTaskRunnerHandle (which includes any | 24 // a) The current thread has a ThreadTaskRunnerHandle (which includes any |
25 // thread that has a MessageLoop associated with it), or | 25 // thread that has a MessageLoop associated with it), or |
26 // b) The current thread is a worker thread belonging to a SequencedWorkerPool | 26 // b) The current thread is a worker thread belonging to a |
27 // *and* is currently running a sequenced task. | 27 // SequencedWorkerPool. |
28 static bool IsSet(); | 28 static bool IsSet(); |
29 | 29 |
30 private: | 30 private: |
31 DISALLOW_IMPLICIT_CONSTRUCTORS(SequencedTaskRunnerHandle); | 31 DISALLOW_IMPLICIT_CONSTRUCTORS(SequencedTaskRunnerHandle); |
32 }; | 32 }; |
33 | 33 |
34 } // namespace base | 34 } // namespace base |
35 | 35 |
36 #endif // BASE_THREADING_SEQUENCED_TASK_RUNNER_HANDLE_H_ | 36 #endif // BASE_THREADING_SEQUENCED_TASK_RUNNER_HANDLE_H_ |
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