Index: third_party/WebKit/Source/core/workers/WorkerThreadLifecycleObserver.h |
diff --git a/third_party/WebKit/Source/core/workers/WorkerThreadLifecycleObserver.h b/third_party/WebKit/Source/core/workers/WorkerThreadLifecycleObserver.h |
new file mode 100644 |
index 0000000000000000000000000000000000000000..44cc813e4a1bcff4f20eb30ea1f2c3e5801b0593 |
--- /dev/null |
+++ b/third_party/WebKit/Source/core/workers/WorkerThreadLifecycleObserver.h |
@@ -0,0 +1,44 @@ |
+// Copyright 2016 The Chromium Authors. All rights reserved. |
+// Use of this source code is governed by a BSD-style license that can be |
+// found in the LICENSE file. |
+ |
+#ifndef WorkerThreadLifecycleObserver_h |
+#define WorkerThreadLifecycleObserver_h |
+ |
+#include "core/CoreExport.h" |
+#include "platform/LifecycleObserver.h" |
+ |
+namespace blink { |
+ |
+class WorkerThreadContext; |
+ |
+// An interface for observing worker thread termination from the main thread. |
+// This may be useful, for example, when an object living on the main thread |
+// needs to release references to objects on the worker thread before it gets |
+// terminated. |
+// |
+// A class that inherits this interface should override |
+// LifecycleObserver::contextDestroyed() that is called on the main thread when |
+// the worker thread is about to terminate. While contextDestroyed() is called, |
+// it is guaranteed that the worker thread is still alive. |
+// |
+// A newly created observer should firstly check whether the worker thread is |
+// alive by wasContextDestroyedBeforeObserverCreation(). If this return true, |
+// the worker thread has already been terminated before the observer is created, |
+// and contextDestroyed() is never notified. |
+class CORE_EXPORT WorkerThreadLifecycleObserver : public LifecycleObserver<WorkerThreadContext, WorkerThreadLifecycleObserver> { |
+protected: |
+ explicit WorkerThreadLifecycleObserver(WorkerThreadContext*); |
+ |
+ bool wasContextDestroyedBeforeObserverCreation() const |
+ { |
+ return m_wasContextDestroyedBeforeObserverCreation; |
+ } |
+ |
+private: |
+ const bool m_wasContextDestroyedBeforeObserverCreation; |
+}; |
+ |
+} // namespace blink |
+ |
+#endif // WorkerThreadLifecycleObserver_h |