Index: media/audio/scoped_task_runner_observer.h |
diff --git a/media/audio/scoped_task_runner_observer.h b/media/audio/scoped_task_runner_observer.h |
new file mode 100644 |
index 0000000000000000000000000000000000000000..ce9adf96713a5d2235a0786d4d73c9502e48d7c4 |
--- /dev/null |
+++ b/media/audio/scoped_task_runner_observer.h |
@@ -0,0 +1,52 @@ |
+// Copyright (c) 2012 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 MEDIA_AUDIO_SCOPED_TASK_RUNNER_OBSERVER_H_ |
+#define MEDIA_AUDIO_SCOPED_TASK_RUNNER_OBSERVER_H_ |
+ |
+#include "base/memory/ref_counted.h" |
+#include "base/message_loop/message_loop.h" |
+ |
+namespace base { |
+class SingleThreadTaskRunner; |
+class WaitableEvent; |
+} |
+ |
+namespace media { |
+ |
+// A common base class for AudioOutputDevice and AudioInputDevice that manages |
+// a task runner and monitors it for destruction. If the object goes out of |
+// scope before the task runner, the object will automatically remove itself |
+// from the task runner's list of destruction observers. |
+// NOTE: The class that inherits from this class must implement the |
+// WillDestroyCurrentMessageLoop virtual method from DestructionObserver. |
+class ScopedTaskRunnerObserver |
DaleCurtis
2013/11/08 19:32:14
Didn't know we had this, probably a few places tha
|
+ : public base::MessageLoop::DestructionObserver { |
+ public: |
+ explicit ScopedTaskRunnerObserver( |
+ const scoped_refptr<base::SingleThreadTaskRunner>& task_runner); |
DaleCurtis
2013/11/08 19:32:14
Just base::TaskRunner on this one no?
|
+ |
+ protected: |
+ virtual ~ScopedTaskRunnerObserver(); |
+ |
+ // Accessor to the loop that's used by the derived class. |
+ const scoped_refptr<base::SingleThreadTaskRunner>& task_runner() { |
+ return task_runner_; |
+ } |
+ |
+ private: |
+ // Call to add or remove ourselves from the list of destruction observers for |
+ // the message loop. |
+ void ObserveLoopDestruction(bool enable, base::WaitableEvent* done); |
+ |
+ // A pointer to the task runner. In case it gets destroyed before this object |
+ // goes out of scope, PostTask() etc will fail but not crash. |
+ scoped_refptr<base::SingleThreadTaskRunner> task_runner_; |
+ |
+ DISALLOW_COPY_AND_ASSIGN(ScopedTaskRunnerObserver); |
+}; |
+ |
+} // namespace media. |
+ |
+#endif // MEDIA_AUDIO_SCOPED_TASK_RUNNER_OBSERVER_H_ |