From: Robert Klemme <shortcutter@...>
Date: 2010-01-04T22:20:06+09:00
Subject: Re: How to know the childs PID of a given process?

On 01/04/2010 11:52 AM, Iņaki Baz Castillo wrote:
> Hi, I know that a Ruby process with PID 1000 (under Linux) has forked 4 times. 
> How could I know the PID of those childs from any other ruby interpreter?
> This is, I just know the PID of the parent (1000).
> 
> Of course I could do some hack as inspecting the output of "ps" and inspecting 
> the pid/ppid, but I'd prfer a ppure Ruby method for this.
> 
> Thanks for any suggestion.

The typical approach is that the forking parent records PIDs of its 
children.  If that information needs to be propagated you can either 
write it to a file or make it available via DRb.

If you need multiple Ruby processes to collaborate I would probably turn 
to DRb anyway.  In that case you might not even need to record PIDs but 
you could have a coordinator where processes register and unregister or 
which starts processes itself.  It depends on your use case.

Kind regards

	robert

-- 
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