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Side by Side Diff: base/threading/thread_task_runner_handle.h

Issue 2959563002: Sequence[d]TaskRunner (Closed)
Patch Set: Created 3 years, 6 months ago
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1 // Copyright 2016 The Chromium Authors. All rights reserved. 1 // Copyright 2016 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 #ifndef BASE_THREADING_THREAD_TASK_RUNNER_HANDLE_H_ 5 #ifndef BASE_THREADING_THREAD_TASK_RUNNER_HANDLE_H_
6 #define BASE_THREADING_THREAD_TASK_RUNNER_HANDLE_H_ 6 #define BASE_THREADING_THREAD_TASK_RUNNER_HANDLE_H_
7 7
8 #include "base/base_export.h" 8 #include "base/base_export.h"
9 #include "base/callback_helpers.h" 9 #include "base/callback_helpers.h"
10 #include "base/macros.h" 10 #include "base/macros.h"
11 #include "base/memory/ref_counted.h" 11 #include "base/memory/ref_counted.h"
12 #include "base/single_thread_task_runner.h" 12 #include "base/single_thread_task_runner.h"
13 13
14 namespace base { 14 namespace base {
15 15
16 // ThreadTaskRunnerHandle stores a reference to a thread's TaskRunner 16 // ThreadTaskRunnerHandle stores a reference to a thread's TaskRunner
17 // in thread-local storage. Callers can then retrieve the TaskRunner 17 // in thread-local storage. Callers can then retrieve the TaskRunner
18 // for the current thread by calling ThreadTaskRunnerHandle::Get(). 18 // for the current thread by calling ThreadTaskRunnerHandle::Get().
19 // At most one TaskRunner may be bound to each thread at a time. 19 // At most one TaskRunner may be bound to each thread at a time.
20 // Prefer SequenceTaskRunnerHandle to this unless thread affinity is required. 20 // Prefer SequencedTaskRunnerHandle to this unless thread affinity is required.
21 class BASE_EXPORT ThreadTaskRunnerHandle { 21 class BASE_EXPORT ThreadTaskRunnerHandle {
22 public: 22 public:
23 // Gets the SingleThreadTaskRunner for the current thread. 23 // Gets the SingleThreadTaskRunner for the current thread.
24 static scoped_refptr<SingleThreadTaskRunner> Get(); 24 static scoped_refptr<SingleThreadTaskRunner> Get();
25 25
26 // Returns true if the SingleThreadTaskRunner is already created for 26 // Returns true if the SingleThreadTaskRunner is already created for
27 // the current thread. 27 // the current thread.
28 static bool IsSet(); 28 static bool IsSet();
29 29
30 // Overrides ThreadTaskRunnerHandle::Get()'s |task_runner_| to point at 30 // Overrides ThreadTaskRunnerHandle::Get()'s |task_runner_| to point at
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46 46
47 private: 47 private:
48 scoped_refptr<SingleThreadTaskRunner> task_runner_; 48 scoped_refptr<SingleThreadTaskRunner> task_runner_;
49 49
50 DISALLOW_COPY_AND_ASSIGN(ThreadTaskRunnerHandle); 50 DISALLOW_COPY_AND_ASSIGN(ThreadTaskRunnerHandle);
51 }; 51 };
52 52
53 } // namespace base 53 } // namespace base
54 54
55 #endif // BASE_THREADING_THREAD_TASK_RUNNER_HANDLE_H_ 55 #endif // BASE_THREADING_THREAD_TASK_RUNNER_HANDLE_H_
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