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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 | |
3 // found in the LICENSE file. | |
4 | |
5 #ifndef WorkerThreadLifecycleObserver_h | |
6 #define WorkerThreadLifecycleObserver_h | |
7 | |
8 #include "core/CoreExport.h" | |
9 #include "platform/LifecycleObserver.h" | |
10 | |
11 namespace blink { | |
12 | |
13 class WorkerThreadContext; | |
14 | |
15 // An interface for observing worker thread termination from the main thread. | |
16 // This may be useful, for example, when an object living on the main thread | |
17 // needs to release references to objects on the worker thread before it gets | |
18 // terminated. | |
19 // | |
20 // A class that inherits this interface should override | |
21 // LifecycleObserver::contextDestroyed() that is called on the main thread when | |
22 // the worker thread is about to terminate. While contextDestroyed() is called, | |
23 // it is guaranteed that the worker thread is still alive. | |
24 // | |
25 // A newly created observer should firstly check whether the worker thread is | |
26 // alive by wasContextDestroyedBeforeObserverCreation(). If this return true, | |
27 // the worker thread has already been terminated before the observer is created, | |
28 // and contextDestroyed() is never notified. | |
29 class CORE_EXPORT WorkerThreadLifecycleObserver : public LifecycleObserver<Worke rThreadContext, WorkerThreadLifecycleObserver> { | |
30 protected: | |
31 WorkerThreadLifecycleObserver(WorkerThreadContext*); | |
32 | |
33 bool wasContextDestroyedBeforeObserverCreation() const | |
34 { | |
35 return m_wasContextDestroyedBeforeObserverCreation; | |
36 }; | |
yhirano
2016/06/09 04:55:13
no semicolon
nhiroki
2016/06/09 07:37:06
Done.
| |
37 | |
38 private: | |
39 const bool m_wasContextDestroyedBeforeObserverCreation; | |
40 }; | |
41 | |
42 } // namespace blink | |
43 | |
44 #endif // WorkerThreadLifecycleObserver_h | |
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