blob: 238435f978e167a251c77e7e38eed7c2390d6971 [file] [log] [blame]
James Robinson646469d2014-10-03 15:33:28 -07001// 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_