From: Xeno Campanoli <xeno.campanoli@...>
Date: 2009-03-25T05:23:43+09:00
Subject: Re: Looking for a method to kill all children for my	Timeout::Error contingency

Jos Backus wrote:
> On Wed, Mar 25, 2009 at 04:57:03AM +0900, Xeno Campanoli wrote:
>> Do I really need to collect all the pids from fork to kill them in that case, or 
>> is there a method I'm not finding in pickaxe that just does it???
> 
> Here's a trick I use, maybe it is useful. Note that even if push-to-slaves
> creates children, those too will be killed because they reside in the same
> process group.

The problem with that is I have many processes, so I would be doing this with 
arrays and loops, which suddenly becomes problematic.  If I could just call 
something that automatically kills the entire tree of children on down that 
would be much nicer...??

> 
>   require 'timeout'
>   signal = '-TERM'
>   timeout = 30
> 
>   pid = Process.fork do
>     Process.setsid
>     exec %{push-to-slaves -v}
>   end
>   begin
>     Timeout::timeout(timeout) { Process.waitpid(pid) }
>   rescue Timeout::Error => exc
>     puts "#{exc.message}, killing pid #{pid}"
>     Process.kill(signal, pid)
>     res = Process.waitpid(pid)
>     puts "pid #{pid.inspect} != res #{res.inspect}" if res != pid
>   end
> 


-- 
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"...Or I might add, because they are denied" - Dr. Albert A. Bartlett
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