base/thread_task_runner_handle.h

   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_THREAD_TASK_RUNNER_HANDLE_H_
   6 #define BASE_THREAD_TASK_RUNNER_HANDLE_H_
   7
   8 #include "base/base_export.h"
   9 #include "base/memory/ref_counted.h"
  10
  11 namespace base {
  12
  13 class SingleThreadTaskRunner;
  14
  15 // ThreadTaskRunnerHandle stores a reference to the main task runner
  16 // for each thread. Not more than one of these objects can be created
  17 // per thread. After an instance of this object is created the Get()
  18 // function will return the |task_runner| specified in the
  19 // constructor.
  20 class BASE_EXPORT ThreadTaskRunnerHandle {
  21  public:
  22   // Gets the SingleThreadTaskRunner for the current thread.
  23   static scoped_refptr<SingleThreadTaskRunner> Get();
  24
  25   ThreadTaskRunnerHandle(
  26       const scoped_refptr<SingleThreadTaskRunner>& task_runner);
  27   ~ThreadTaskRunnerHandle();
  28
  29  private:
  30   scoped_refptr<SingleThreadTaskRunner> task_runner_;
  31 };
  32
  33 }  // namespace base
  34
  35 #endif  // BASE_THREAD_TASK_RUNNER_HANDLE_H_