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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. | |
4 | |
5 #ifndef BASE_MESSAGE_LOOP_MESSAGE_LOOP_PROXY_H_ | |
6 #define BASE_MESSAGE_LOOP_MESSAGE_LOOP_PROXY_H_ | |
7 | |
8 #include "base/base_export.h" | |
9 #include "base/compiler_specific.h" | |
10 #include "base/memory/ref_counted.h" | |
11 #include "base/single_thread_task_runner.h" | |
12 | |
13 // MessageLoopProxy is deprecated. Code should prefer to depend on TaskRunner | |
14 // (or the various specializations) for passing task runners around, and should | |
15 // use ThreadTaskRunnerHandle::Get() to get the thread's associated task runner. | |
16 // | |
17 // See http://crbug.com/391045 for more details. | |
18 // Example for these changes: | |
19 // | |
20 // base::MessageLoopProxy::current() -> base::ThreadTaskRunnerHandle::Get() | |
21 // scoped_refptr<base::MessageLoopProxy> -> | |
22 // scoped_refptr<base::SingleThreadTaskRunner> | |
23 // base::MessageLoopProxy -> base::SingleThreadTaskRunner | |
24 | |
25 namespace base { | |
26 | |
27 // This class provides a thread-safe refcounted interface to the Post* methods | |
28 // of a message loop. This class can outlive the target message loop. | |
29 // MessageLoopProxy objects are constructed automatically for all MessageLoops. | |
30 // So, to access them, you can use any of the following: | |
31 // Thread::message_loop_proxy() | |
32 // MessageLoop::current()->message_loop_proxy() | |
33 // MessageLoopProxy::current() | |
34 // | |
35 // TODO(akalin): Now that we have the *TaskRunner interfaces, we can | |
36 // merge this with MessageLoopProxyImpl. | |
37 class BASE_EXPORT MessageLoopProxy : public SingleThreadTaskRunner { | |
38 public: | |
39 // Gets the MessageLoopProxy for the current message loop, creating one if | |
40 // needed. | |
41 static scoped_refptr<MessageLoopProxy> current(); | |
42 | |
43 protected: | |
44 MessageLoopProxy(); | |
45 ~MessageLoopProxy() override; | |
46 }; | |
47 | |
48 } // namespace base | |
49 | |
50 #endif // BASE_MESSAGE_LOOP_MESSAGE_LOOP_PROXY_H_ | |
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