Example nonblocking read from a Named Pipe (created elsewhere)

nonblock-named-pipe-read-example-pseudo.rb

class Engine 

    def initialize #pipe_ui_wr, pipe_eng_rdr
      #...
      # call named_pipe method which returns opened pipe
      @pipe_from_ui = named_pipe( Pipes[:engine_in], "r" )
      msg_ui = @pipe_from_ui.gets # blocks until ui msg
      #...
    end

    def main_loop argh
      # ...
      while _exec_state_int == 1
        # handle UI-messages
        msg_ui = nil
        
        begin
          msg_ui = @pipe_from_ui.read_nonblock(2)
        rescue IO::WaitReadable
          IO.select([@pipe_from_ui], [], [], 0)
          #next
        end
        
        if msg_ui != nil
          msg_ui = msg_ui.strip
          p " ***** Engine got ui message: #{msg_ui}"
          # etc etc
        end

        # do other while stuff
        
      end
#...
end