OLD | NEW |
(Empty) | |
| 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 explicit WorkerThreadLifecycleObserver(WorkerThreadContext*); |
| 32 |
| 33 bool wasContextDestroyedBeforeObserverCreation() const |
| 34 { |
| 35 return m_wasContextDestroyedBeforeObserverCreation; |
| 36 } |
| 37 |
| 38 private: |
| 39 const bool m_wasContextDestroyedBeforeObserverCreation; |
| 40 }; |
| 41 |
| 42 } // namespace blink |
| 43 |
| 44 #endif // WorkerThreadLifecycleObserver_h |
OLD | NEW |