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3) Code would need to query both the Channel and any StreamListeners chained between the socket and the target listener, to make sure they are all safe to be switched to a different thread for OnDataAvailable. (We could modify any relevant existing internal listeners to become safe, but since some listeners could come from extensions, we cannot guarantee all listeners will always be safe). Code must be prepared to handle the case where OnDataAvailable cannot be redirected to the desired thread.
4) The implementation would probably consist of two new XPCOM interfaces, one for thread-retargetable Channels, one for Listeners (nsIThreadSinkableChannel and nsIThreadSinkableStreamListener?). The Channel interface would probably have a method that checks the chain of Listeners to ensure that they are all ThreadSink listeners, or fails.
== Implemention Questions ==
