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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef BASE_SINGLE_THREAD_TASK_RUNNER_H_
#define BASE_SINGLE_THREAD_TASK_RUNNER_H_
#include "base/base_export.h"
#include "base/sequenced_task_runner.h"
namespace base {
// A SingleThreadTaskRunner is a SequencedTaskRunner with one more
// guarantee; namely, that all tasks are run on a single dedicated
// thread. Most use cases require only a SequencedTaskRunner, unless
// there is a specific need to run tasks on only a single thread.
//
// SingleThreadTaskRunner implementations might:
// - Post tasks to an existing thread's MessageLoop (see
// MessageLoop::task_runner()).
// - Create their own worker thread and MessageLoop to post tasks to.
// - Add tasks to a FIFO and signal to a non-MessageLoop thread for them to
// be processed. This allows TaskRunner-oriented code run on threads
// running other kinds of message loop, e.g. Jingle threads.
class BASE_EXPORT SingleThreadTaskRunner : public SequencedTaskRunner {
public:
// A more explicit alias to RunsTasksInCurrentSequence().
bool BelongsToCurrentThread() const { return RunsTasksInCurrentSequence(); }
protected:
~SingleThreadTaskRunner() override = default;
};
} // namespace base
#endif // BASE_SINGLE_THREAD_TASK_RUNNER_H_
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