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[chromium-blink-merge.git] / base / thread_task_runner_handle.h
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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.
5 #ifndef BASE_THREAD_TASK_RUNNER_HANDLE_H_
6 #define BASE_THREAD_TASK_RUNNER_HANDLE_H_
8 #include "base/base_export.h"
9 #include "base/memory/ref_counted.h"
11 namespace base {
13 class SingleThreadTaskRunner;
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.
19 class BASE_EXPORT ThreadTaskRunnerHandle {
20 public:
21 // Gets the SingleThreadTaskRunner for the current thread.
22 static scoped_refptr<SingleThreadTaskRunner> Get();
24 // Returns true if the SingleThreadTaskRunner is already created for
25 // the current thread.
26 static bool IsSet();
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();
34 private:
35 scoped_refptr<SingleThreadTaskRunner> task_runner_;
38 } // namespace base
40 #endif // BASE_THREAD_TASK_RUNNER_HANDLE_H_