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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 MessageLoopProxy).

 //   - 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 RunsTasksOnCurrentThread().

   bool BelongsToCurrentThread() const {

     return RunsTasksOnCurrentThread();

   }

  protected:

   virtual ~SingleThreadTaskRunner() {}

 };

 }  // namespace base

 #endif  // BASE_SINGLE_THREAD_TASK_RUNNER_H_