# File lib_core/rucy/messenger.rb, line 346
    def stop_messengers(num_of_messengers, socket_queue, messenger_thgrp, restart_signal=nil)
      num_of_messengers.times do
        socket_queue.push_close
      end
      if (restart_signal) then
        restart_signal.cancel
      end
      for thread in messenger_thgrp.list
        thread.join
      end

      nil
    end