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| 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 |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #ifndef BASE_THREADING_SEQUENCED_TASK_RUNNER_HANDLE_H_ |
| 6 #define BASE_THREADING_SEQUENCED_TASK_RUNNER_HANDLE_H_ |
| 7 |
| 8 #include "base/compiler_specific.h" |
| 9 #include "base/memory/ref_counted.h" |
| 10 |
| 11 namespace base { |
| 12 |
| 13 class SequencedTaskRunner; |
| 14 |
| 15 class BASE_EXPORT SequencedTaskRunnerHandle { |
| 16 public: |
| 17 // Returns a SequencedTaskRunner which guarantees that posted tasks will only |
| 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 |
| 20 // the requirements). |
| 21 static scoped_refptr<SequencedTaskRunner> Get(); |
| 22 |
| 23 // Returns true if one of the following conditions is fulfilled: |
| 24 // a) The current thread has a ThreadTaskRunnerHandle (which includes any |
| 25 // thread that has a MessageLoop associated with it), or |
| 26 // b) The current thread is a worker thread belonging to a SequencedWorkerPool |
| 27 // *and* is currently running a sequenced task. |
| 28 static bool IsSet(); |
| 29 |
| 30 private: |
| 31 DISALLOW_IMPLICIT_CONSTRUCTORS(SequencedTaskRunnerHandle); |
| 32 }; |
| 33 |
| 34 } // namespace base |
| 35 |
| 36 #endif // BASE_THREADING_SEQUENCED_TASK_RUNNER_HANDLE_H_ |
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