# File lib/em/pure_ruby.rb, line 385
    def open_loopbreaker
      # Can't use an IO.pipe because they can't be set nonselectable in Windows.
      # Pick a random localhost UDP port.
      #@loopbreak_writer.close if @loopbreak_writer
      #rd,@loopbreak_writer = IO.pipe
      @loopbreak_reader = UDPSocket.new
      @loopbreak_writer = UDPSocket.new
      bound = false
      100.times {
        @loopbreak_port = rand(10000) + 40000
        begin
          @loopbreak_reader.bind "localhost", @loopbreak_port
          bound = true
          break
        rescue
        end
      }
      raise "Unable to bind Loopbreaker" unless bound
      LoopbreakReader.new(@loopbreak_reader)
    end