Catching runaway process

Hi, I probably should introduce myself before hitting you with some new
questions. I've been developing a website with games written in Java, and
decided that it was too slow to develop each new game, hence the interest in
Squeak. As I live on a French Alp, I have plenty of time for coding during
the off season.

My current project to teach myself Squeak is an experiment with
genetic/evolution algorithm. 

Because of the randomness, I need to be able to catch antisocial processes.
I thought I could do this with CPUWatcher:

CPUWatcher startMonitoringPeriod: 20
                rate: 100
                threshold: 0.3

or by starting with the defaults in ProcessBrowser.

!Darwin methodsFor: 'as yet unclassified' stamp: 'ss 12/6/2007 18:21'!
intentionalRunaway      self intentionalRunaway! !

[Darwin new intentionalRunaway] forkAt: 30 named: 'runaway'
or just 
Darwin new intentionalRunaway

I expected this to be caught by catchThePig, but it doesn't appear to find
it. 

My O/S is Ubuntu 7.10, and the result was the same under Windows XP SP/2.

Have I misunderstood the function of ProcessBrowser/CPUWatcher/catchThePig?

Thanks,    ...Stan
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