From: Christopher Dancy <christoforever@...>
Date: 2010-04-08T01:50:00+09:00
Subject: Re: Getting output of program with some DRb for good measure

Christopher Dancy wrote:
> I'm running a DRb service which accepts a string<file name> and than
> processes that file name on the server side. So I've been digging around
> the internet and it seems people have been running into the same
> problems as me. The DRb service will execute the file ... but doing so
> will block the DRb service until IO.popen is finished. A way of getting
> around this is to put the executing IO.popen block into a thread ...
> which does work. The problem comes when printing to standard out ... it
> wont.
> 
> IO.popen("#{command_string}","w+") do |ant_output|
>   Thread.new {
>   ant_output.each do |line|
>            puts line
>   end
>   }
> end
> 
> I need the output of the given program being run to be printed to the
> screen and I can't seem to figure it out... any suggestions?

I've narrowed down the problem a bit ... it seems I get the output from 
within the thread but not from within the ant_ouput block. So if I do 
something like ..

IO.popen("#{command_string}","w+") do |ant_output|
   Thread.new {
   puts "hello world"
   ant_output.each do |line|
            puts "fish sticks"
            puts line
   end
   }
end

I do get the "hello world" but not the "fish sticks" ... I've tried 
passing the ant_output block to the thread but still nothing.
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