Merge 94608 - MediaElementAudioSourceNode destruction triggers ASSERTS

Source/WebCore/webaudio/AudioContext.cpp

 /*
  * Copyright (C) 2010, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1.  Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 239 matching lines @@
 
 bool AudioContext::isRunnable() const
 {
     if (!isInitialized())
         return false;
     
     // Check with the HRTF spatialization system to see if it's finished loading.
     return m_hrtfDatabaseLoader->isLoaded();
 }
 
+void AudioContext::uninitializeDispatch(void* userData)
+{
+    AudioContext* context = reinterpret_cast<AudioContext*>(userData);
+    ASSERT(context);
+    if (!context)
+        return;
+
+    context->uninitialize();
+}
+
 void AudioContext::stop()
 {
     m_document = 0; // document is going away
-    uninitialize();
+
+    // Don't call uninitialize() immediately here because the ScriptExecutionContext is in the middle
+    // of dealing with all of its ActiveDOMObjects at this point. uninitialize() can de-reference other
+    // ActiveDOMObjects so let's schedule uninitialize() to be called later.
+    // FIXME: see if there's a more direct way to handle this issue.
+    callOnMainThread(uninitializeDispatch, this);
 }
 
 Document* AudioContext::document() const
 {
     ASSERT(m_document);
     return m_document;
 }
 
 bool AudioContext::hasDocument()
 {
@@ skipping 473 matching lines @@
     // Avoid firing the event if the document has already gone away.
     if (hasDocument()) {
         // Call the offline rendering completion event listener.
         dispatchEvent(OfflineAudioCompletionEvent::create(renderedBuffer));
     }
 }
 
 } // namespace WebCore
 
 #endif // ENABLE(WEB_AUDIO)