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47 lines
1.7 KiB
C++
47 lines
1.7 KiB
C++
// Copyright 2015 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_THREADING_SEQUENCED_TASK_RUNNER_HANDLE_H_
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#define BASE_THREADING_SEQUENCED_TASK_RUNNER_HANDLE_H_
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#include "base/compiler_specific.h"
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#include "base/macros.h"
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#include "base/memory/ref_counted.h"
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#include "base/sequenced_task_runner.h"
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namespace base {
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class BASE_EXPORT SequencedTaskRunnerHandle {
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public:
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// Returns a SequencedTaskRunner which guarantees that posted tasks will only
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// run after the current task is finished and will satisfy a SequenceChecker.
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// It should only be called if IsSet() returns true (see the comment there for
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// the requirements).
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static scoped_refptr<SequencedTaskRunner> Get();
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// Returns true if one of the following conditions is fulfilled:
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// a) A SequencedTaskRunner has been assigned to the current thread by
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// instantiating a SequencedTaskRunnerHandle.
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// b) The current thread has a ThreadTaskRunnerHandle (which includes any
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// thread that has a MessageLoop associated with it), or
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// c) The current thread is a worker thread belonging to a SequencedWorkerPool
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// *and* is currently running a sequenced task (note: not supporting
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// unsequenced tasks is intentional: https://crbug.com/618043#c4).
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static bool IsSet();
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// Binds |task_runner| to the current thread.
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explicit SequencedTaskRunnerHandle(
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scoped_refptr<SequencedTaskRunner> task_runner);
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~SequencedTaskRunnerHandle();
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private:
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scoped_refptr<SequencedTaskRunner> task_runner_;
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DISALLOW_COPY_AND_ASSIGN(SequencedTaskRunnerHandle);
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};
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} // namespace base
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#endif // BASE_THREADING_SEQUENCED_TASK_RUNNER_HANDLE_H_
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