(self, listener)
Add a listener on the list of the manager
        @param listener : the listener instance
Add a listener on the list of the manager
Add a listener on the list of the manager
def add_listener(self, listener):
        """
        Add a listener on the list of the manager
        @param listener : the listener instance
        """
        self._lock_list.acquire()
        self._listeners.append(listener)
        self._lock_list.release()
def add_listener ( self , listener ) : self . _lock_list . acquire ( ) self . _listeners . append ( listener ) self . _lock_list . release ( )