1// Copyright (c) 2012 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_SINGLE_THREAD_TASK_RUNNER_H_ 6#define BASE_SINGLE_THREAD_TASK_RUNNER_H_ 7 8#include "base/base_export.h" 9#include "base/sequenced_task_runner.h" 10 11namespace base { 12 13// A SingleThreadTaskRunner is a SequencedTaskRunner with one more 14// guarantee; namely, that all tasks are run on a single dedicated 15// thread. Most use cases require only a SequencedTaskRunner, unless 16// there is a specific need to run tasks on only a single thread. 17// 18// SingleThreadTaskRunner implementations might: 19// - Post tasks to an existing thread's MessageLoop (see MessageLoopProxy). 20// - Create their own worker thread and MessageLoop to post tasks to. 21// - Add tasks to a FIFO and signal to a non-MessageLoop thread for them to 22// be processed. This allows TaskRunner-oriented code run on threads 23// running other kinds of message loop, e.g. Jingle threads. 24class BASE_EXPORT SingleThreadTaskRunner : public SequencedTaskRunner { 25 public: 26 // A more explicit alias to RunsTasksOnCurrentThread(). 27 bool BelongsToCurrentThread() const { 28 return RunsTasksOnCurrentThread(); 29 } 30 31 protected: 32 virtual ~SingleThreadTaskRunner() {} 33}; 34 35} // namespace base 36 37#endif // BASE_SINGLE_THREAD_TASK_RUNNER_H_ 38