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This provides a way to feed work items to the main loop using a GAsyncQueue without polling it.
void (*RBAsyncQueueWatchFunc) (gpointer item,gpointer data);
Callback to call when an item is found in the queue.
guint rb_async_queue_watch_new (GAsyncQueue *queue,gint priority,RBAsyncQueueWatchFunc callback,gpointer user_data,GDestroyNotify notify,GMainContext *context);
Creates a new GSource that triggers when the GAsyncQueue is non-empty. This is used in rhythmbox to process queues within RhythmDB in the main thread without polling.