From: Johan Andersen <jonntp@...>
Date: 2006-04-24T01:40:39+09:00
Subject: Re: How to properly interact with processes?

I just saw that the forum destroyed the code by wrapping the lines too 
early. Here is the code with shorter lines.

def time(s)
  @st ||= Time.now
  printf "%s at: %fs\n", s, Time.now - @st
end

def run_proc(cmd,&callback)
  t = Thread.new(cmd){
    IO.popen(cmd){|p|
      @pid = p.pid
      while(s=p.gets)
        callback.call(s)
      end
    }
  }
  while(!@pid) do sleep 0.01 end
  t
end

time("1. Starting external process")
CMD = %{ruby -e "sleep 5;puts 'from process(#{$$})'"}
t=run_proc(CMD) {|s|
  puts "4. Done! #{s}"
}
time("2. External process (PID:#{@pid}) started")
time("3. Begun doing something else while proc works")
t.join
time("5. External proc done")

-- 
Posted via http://www.ruby-forum.com/.