gistfile1.txt

    # read_pipes
    def read_pipes
      msg = nil 
      msg = read_line_nonblocking( @pipe_from_eng )
      if msg != nil 
        p_dbg "got msg: #{msg}", self
      end 
      if msg == "2" 
        @pipe_to_ui.puts "Engine told me: 2"
        @pipe_to_ui.flush
      end 

      msg = nil 
      msg = read_line_nonblocking( @pipe_from_ui )
      if msg != nil 
        p_dbg "got msg: #{msg}", self                                                                                                                  
        @msg_stack.push msg 
      end 
    end

# read_pipes
def read_pipes
  Qo.case(read_line_nonblocking(@pipe_from_eng)) { |m|
    m.when(Qo.not(nil), '2') {
      p_dbg("got msg: #{msg}", self)
      @pipe_to_ui.puts "Engine told me: 2"
      @pipe_to_ui.flush
    }
    
    m.when(Qo.not(nil)) {
      p_dbg("got msg: #{msg}", self)
    }
  }

  Qo.case(read_line_nonblocking(@pipe_from_ui)) { |m|
    m.when(Qo.not(nil)) { |message|
      p_dbg "got msg: #{msg}", self                                                                                                                  
      @msg_stack.push msg 
    }
  }
end