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 11namespace base { 12 13class SingleThreadTaskRunner; 14 15// ThreadTaskRunnerHandle stores a reference to a thread's TaskRunner 16// in thread-local storage. Callers can then retrieve the TaskRunner 17// for the current thread by calling ThreadTaskRunnerHandle::Get(). 18// At most one TaskRunner may be bound to each thread at a time. 19class BASE_EXPORT ThreadTaskRunnerHandle { 20 public: 21 // Gets the SingleThreadTaskRunner for the current thread. 22 static scoped_refptr<SingleThreadTaskRunner> Get(); 23 24 // Returns true if the SingleThreadTaskRunner is already created for 25 // the current thread. 26 static bool IsSet(); 27 28 // Binds |task_runner| to the current thread. |task_runner| must belong 29 // to the current thread for this to succeed. 30 explicit ThreadTaskRunnerHandle( 31 const scoped_refptr<SingleThreadTaskRunner>& task_runner); 32 ~ThreadTaskRunnerHandle(); 33 34 private: 35 scoped_refptr<SingleThreadTaskRunner> task_runner_; 36}; 37 38} // namespace base 39 40#endif // BASE_THREAD_TASK_RUNNER_HANDLE_H_ 41