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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_THREAD_TASK_RUNNER_HANDLE_H_

 #define BASE_THREAD_TASK_RUNNER_HANDLE_H_

 #include "base/base_export.h"

 #include "base/memory/ref_counted.h"

 namespace base {

 class SingleThreadTaskRunner;

 // ThreadTaskRunnerHandle stores a reference to a thread's TaskRunner

 // in thread-local storage.  Callers can then retrieve the TaskRunner

 // for the current thread by calling ThreadTaskRunnerHandle::Get().

 // At most one TaskRunner may be bound to each thread at a time.

 class BASE_EXPORT ThreadTaskRunnerHandle {

  public:

   // Gets the SingleThreadTaskRunner for the current thread.

   static scoped_refptr<SingleThreadTaskRunner> Get();

   // Returns true if the SingleThreadTaskRunner is already created for

   // the current thread.

   static bool IsSet();

   // Binds |task_runner| to the current thread. |task_runner| must belong

   // to the current thread for this to succeed.

   explicit ThreadTaskRunnerHandle(

       const scoped_refptr<SingleThreadTaskRunner>& task_runner);

   ~ThreadTaskRunnerHandle();

  private:

   scoped_refptr<SingleThreadTaskRunner> task_runner_;

 };

 }  // namespace base

 #endif  // BASE_THREAD_TASK_RUNNER_HANDLE_H_