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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/macros.h" | 9 #include "base/macros.h" |
10 #include "base/memory/ref_counted.h" | 10 #include "base/memory/ref_counted.h" |
(...skipping 14 matching lines...) Expand all Loading... | |
25 // Returns true if the SingleThreadTaskRunner is already created for | 25 // Returns true if the SingleThreadTaskRunner is already created for |
26 // the current thread. | 26 // the current thread. |
27 static bool IsSet(); | 27 static bool IsSet(); |
28 | 28 |
29 // Binds |task_runner| to the current thread. |task_runner| must belong | 29 // Binds |task_runner| to the current thread. |task_runner| must belong |
30 // to the current thread for this to succeed. | 30 // to the current thread for this to succeed. |
31 explicit ThreadTaskRunnerHandle( | 31 explicit ThreadTaskRunnerHandle( |
32 scoped_refptr<SingleThreadTaskRunner> task_runner); | 32 scoped_refptr<SingleThreadTaskRunner> task_runner); |
33 ~ThreadTaskRunnerHandle(); | 33 ~ThreadTaskRunnerHandle(); |
34 | 34 |
35 // A ThreadTaskRunnerHandle::NestedForTesting is the same thing as a | |
36 // ThreadTaskRunnerHandle except that it allows overriding an existing | |
37 // ThreadTaskRunnerHandle in its scope. Nesting ThreadTaskRunnerHandles isn't | |
38 // generally desired but it can be useful in unit tests where multiple task | |
39 // runners are sharing the main thread for simplicity and determinism. | |
40 class BASE_EXPORT NestedForTesting { | |
danakj
2017/02/16 17:57:24
Proposal to make the changes less invasive.
1) Ov
gab
2017/02/16 21:03:36
That's what I wanted to do at first, but then hit
| |
41 public: | |
42 explicit NestedForTesting( | |
43 scoped_refptr<SingleThreadTaskRunner> task_runner); | |
44 ~NestedForTesting(); | |
45 | |
46 private: | |
47 friend class ThreadTaskRunnerHandle; | |
48 | |
49 scoped_refptr<SingleThreadTaskRunner> task_runner_; | |
50 const NestedForTesting* const previous_handle_; | |
51 | |
52 DISALLOW_COPY_AND_ASSIGN(NestedForTesting); | |
53 }; | |
54 | |
35 private: | 55 private: |
36 scoped_refptr<SingleThreadTaskRunner> task_runner_; | 56 // The impl uses NestedForTesting to avoid code duplication but this is the |
57 // only allowed non-test usage. | |
58 std::unique_ptr<NestedForTesting> handle_; | |
37 | 59 |
38 DISALLOW_COPY_AND_ASSIGN(ThreadTaskRunnerHandle); | 60 DISALLOW_COPY_AND_ASSIGN(ThreadTaskRunnerHandle); |
39 }; | 61 }; |
40 | 62 |
41 } // namespace base | 63 } // namespace base |
42 | 64 |
43 #endif // BASE_THREADING_THREAD_TASK_RUNNER_HANDLE_H_ | 65 #endif // BASE_THREADING_THREAD_TASK_RUNNER_HANDLE_H_ |
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