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Tue Jan 25 15:53:20 CET 2005 · https://mail.python.org/pipermail/python-dev/2005-January/051281.html

On Wednesday 26 January 2005 01:01, Donovan Baarda wrote:
> In this case it turns out to be "don't do exec() in a thread, because what
> you exec can have all it's signals masked". That turns out to be a hell of
> a lot of things; popen, os.command, etc. They all only work OK in a
> threaded application if what you are exec'ing doesn't use any signals.

Yep. You just have to be aware of it. We do a bit of this at work, and we
either spool via a database table, or a directory full of spool files. 

> Actually, I've noticed that zope often has a sorta zombie "which" process
> which it spawns. I wonder it this is a stuck thread waiting for some
> signal...

Quite likely.

-- 
Anthony Baxter     <anthony at interlink.com.au>
It's never too late to have a happy childhood.

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[Python-Dev] Strange segfault in Python threads and linux kernel 2.6