shutdown

# File lib/drb/drb.rb, line 1488
    def shutdown
      current = Thread.current
      if @protocol.respond_to? :shutdown
        @protocol.shutdown
      else
        [@thread, *@grp.list].each { |thread|
          thread.kill unless thread == current # xxx: Thread#kill
        }
      end
      @thread.join unless @thread == current
    end