From: x1 <caldridge@...>
Date: 2005-12-03T12:40:28+09:00
Subject: Re: Problem with method that starts process, yields pid then yields return code

it seems to work!!

Let me spend some time trying to make sense of it... Thanks
soooooooooooooooo much!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
*grins*

On 12/2/05, ara.t.howard@noaa.gov <ara.t.howard@noaa.gov> wrote:
> On Fri, 2 Dec 2005, x1 wrote:
>
> > I'm trying to create a method that will kick off a new process, return it's
> > pid.. while allowing the return code to also be captured for later
> > examination..  [on windows platform]
>
> should work, but untested on windows:
>
>    harp:~ > cat a.rb
>
>    require "thread"
>    class Exec
>      %w( cmd queue pipe pid thread exitstatus ).each{|a| attr_accessor a}
>      def initialize cmd
>        self.cmd = cmd
>        self.queue = ::Queue::new
>        self.thread =
>          ::Thread::new(queue) do |q|
>            pipe = ::IO::popen cmd
>            q.push pipe
>            q.push pipe.pid
>            begin
>              loop{ stdout = pipe.gets or break }
>              pipe.close
>              q.push $?.exitstatus
>            rescue => e
>              q.push e
>            end
>          end
>        self.pipe = queue.pop
>        self.pid = queue.pop
>        self.exitstatus = nil
>      end
>      def wait
>        self.exitstatus = self.queue.pop
>      end
>      def self::[](*a, &b) new *a, &b end
>    end
>
>    require "yaml"
>
>    y "start" => Time::now
>    sleep = Exec[ " ruby -e' sleep 2 and exit 42 ' " ]
>    y "cmd" => sleep.cmd
>    y "pid" => sleep.pid
>    y "exitstatus" => sleep.wait
>    y "finish" => Time::now
>
>    harp:~ > ruby a.rb
>    ---
>    start: 2005-12-02 14:03:29.920649 -07:00
>    ---
>    cmd: " ruby -e' sleep 2 and exit 42 ' "
>    ---
>    pid: 19947
>    ---
>    exitstatus: 42
>    ---
>    finish: 2005-12-02 14:03:31.930995 -07:00
>
>
> kind regards.
>
> -a
> --
> ===============================================================================
> | ara [dot] t [dot] howard [at] noaa [dot] gov
> | all happiness comes from the desire for others to be happy.  all misery
> | comes from the desire for oneself to be happy.
> | -- bodhicaryavatara
> ===============================================================================
>
>
>