code: def get_new_working_set(self):
          
          new_list_of_ips = None
          while True:
              try:
                  new_list_of_ips = self.q_monitor_ips.get_nowait()
                  self.q_monitor_ips.task_done()
                  if type(new_list_of_ips) is MonitorPluginStopSignal:
                      raise StopReceived()
              except Queue.Empty:
                  # No more messages, all done reading monitor list for now
                  break
          if new_list_of_ips is not None:
              CURRENT_STATE.working_set = new_list_of_ips
          return new_list_of_ips
docs: Get a new list of IPs to work with from the queue.
  
          This returns None if there is no update.
  
          Read all the messages from the queue on which we get the IP addresses
          that we have to monitor. We will ignore all of them, except the last
          one, since maybe we received two updates in a row, but each update
          is a full state, so only the last one matters.
  
          Raises the StopReceived exception if the stop signal ("None") was
          received on the notification queue.