From: Robert Klemme <shortcutter@...>
Date: 2012-06-29T23:54:13+09:00
Subject: Re: Asynchronous IO

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On Thu, Jun 28, 2012 at 4:36 PM, Andrea Dallera
<andrea@andreadallera.com> wrote:
> =A0This is far from a clean solution, mind you:

Things to improve:

- use the block form of IO.popen
- close writing when finished
- join on the reader thread

> =A0 =A0 pipe =3D=A0IO.popen("command", "options")
> =A0 =A0 Thread.new do
> =A0 =A0 =A0 while(true)
> =A0 =A0 =A0 =A0 p pipe.gets
> =A0 =A0 =A0 end
> =A0 =A0 end
> =A0 =A0 pipe.puts("I'm writing this on the pipe")
>
> You should see the process's output in your STDOUT.

$ ruby19 popen.rb
  0.000 main      : "started"
  0.040 writer    : "about to write first line"
  0.041 reader    : "     1\tfirst line\n"
  1.041 writer    : "about to write second line"
  1.041 reader    : "     2\tsecond line\n"
  6.041 writer    : "about to write last line"
  6.041 reader    : "     3\tlast line\n"
  6.041 writer    : "closed"
  6.041 writer    : "joined"
  6.042 main      : "finished"

Kind regards

robert

--=20
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/

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