Avoid pushing fake packet more than once per queue for a given connection.

git-svn-id: https://svn.erp5.org/repos/neo/trunk@1770 71dcc9de-d417-0410-9af5-da40c76e7ee4

neo/dispatcher.py

@@ -70,9 +70,12 @@ class Dispatcher:
         try:
             message_table = self.message_table.pop(id(conn), EMPTY)
         finally:
-            self.message_table_lock_release()
+        notified_set = set()
         for queue in message_table.itervalues():
+            queue_id = id(queue)
+            if queue_id not in notified_set:
                 queue.put((conn, None))
+                notified_set.add(queue_id)
 
     def registered(self, conn):
         """Check if a connection is registered into message table."""