# File lib/Dnsruby/Resolver.rb, line 402
    def Resolver.use_eventmachine(on=true)
      if (!@@event_machine_available)
        raise RuntimeError.new("EventMachine is not available in this environment!")
      end
      @@use_eventmachine = on
      if (on)
        TheLog.info("EventMachine will be used for IO")
      else
        TheLog.info("EventMachine will not be used for IO")
      end
    end