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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/macros.h" | 9 #include "base/macros.h" |
10 #include "base/memory/ref_counted.h" | 10 #include "base/memory/ref_counted.h" |
11 | 11 |
12 namespace base { | 12 namespace base { |
13 | 13 |
14 class SequencedTaskRunner; | 14 class SequencedTaskRunner; |
15 | 15 |
16 class BASE_EXPORT SequencedTaskRunnerHandle { | 16 class BASE_EXPORT SequencedTaskRunnerHandle { |
17 public: | 17 public: |
18 // Returns a SequencedTaskRunner which guarantees that posted tasks will only | 18 // Returns a SequencedTaskRunner which guarantees that posted tasks will only |
19 // run after the current task is finished and will satisfy a SequenceChecker. | 19 // run after the current task is finished and will satisfy a SequenceChecker. |
20 // It should only be called if IsSet() returns true (see the comment there for | 20 // It should only be called if IsSet() returns true (see the comment there for |
21 // the requirements). | 21 // the requirements). |
22 static scoped_refptr<SequencedTaskRunner> Get(); | 22 static scoped_refptr<SequencedTaskRunner> Get(); |
23 | 23 |
24 // Returns true if one of the following conditions is fulfilled: | 24 // Returns true if one of the following conditions is fulfilled: |
25 // a) The current thread has a ThreadTaskRunnerHandle (which includes any | 25 // a) The current thread has a ThreadTaskRunnerHandle (which includes any |
26 // thread that has a MessageLoop associated with it), or | 26 // thread that has a MessageLoop associated with it), or |
27 // b) The current thread is a worker thread belonging to a SequencedWorkerPool | 27 // b) The current thread is a worker thread belonging to a |
28 // *and* is currently running a sequenced task. | 28 // SequencedWorkerPool. |
29 static bool IsSet(); | 29 static bool IsSet(); |
30 | 30 |
31 private: | 31 private: |
32 DISALLOW_IMPLICIT_CONSTRUCTORS(SequencedTaskRunnerHandle); | 32 DISALLOW_IMPLICIT_CONSTRUCTORS(SequencedTaskRunnerHandle); |
33 }; | 33 }; |
34 | 34 |
35 } // namespace base | 35 } // namespace base |
36 | 36 |
37 #endif // BASE_THREADING_SEQUENCED_TASK_RUNNER_HANDLE_H_ | 37 #endif // BASE_THREADING_SEQUENCED_TASK_RUNNER_HANDLE_H_ |
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