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How do twisted and multiprocessing.Process create zombies?
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bitcycle  
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 More options Jul 5 2011, 5:52 pm
Newsgroups: comp.lang.python
From: bitcycle <sean.m.oc...@gmail.com>
Date: Tue, 5 Jul 2011 14:52:49 -0700 (PDT)
Local: Tues, Jul 5 2011 5:52 pm
Subject: How do twisted and multiprocessing.Process create zombies?
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In python, using twisted loopingcall, multiprocessing.Process, and multiprocessing.Queue; is it possible to create a zombie process. And, if so, then how?

 
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Stefan Behnel  
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 More options Jul 5 2011, 8:47 pm
Newsgroups: comp.lang.python
From: Stefan Behnel <stefan...@behnel.de>
Date: Wed, 06 Jul 2011 02:47:55 +0200
Local: Tues, Jul 5 2011 8:47 pm
Subject: Re: How do twisted and multiprocessing.Process create zombies?
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bitcycle, 05.07.2011 23:52:

> In python, using twisted loopingcall, multiprocessing.Process, and multiprocessing.Queue; is it possible to create a zombie process. And, if so, then how?

I think it's best to consult your local Voodoo master on the matter of
zombie creation processes.

That being said, there are far too many zombies around already, so please
don't add to that.

Stefan


 
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Nobody  
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 More options Jul 6 2011, 8:22 pm
Newsgroups: comp.lang.python
From: Nobody <nob...@nowhere.com>
Date: Thu, 07 Jul 2011 01:22:05 +0100
Local: Wed, Jul 6 2011 8:22 pm
Subject: Re: How do twisted and multiprocessing.Process create zombies?
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On Tue, 05 Jul 2011 14:52:49 -0700, bitcycle wrote:
> In python, using twisted loopingcall, multiprocessing.Process, and
> multiprocessing.Queue; is it possible to create a zombie process. And, if
> so, then how?

A zombie is a process which has terminated but hasn't been wait()ed on
(aka "reaped") by its parent.

Most libraries which create child processes make some effort to reap them.
E.g. the subprocess module keeps a list of "orphaned" processes (those for
which the Popen object was deleted while the underlying process was still
alive), and polls the list periodically (specifically, whenever a new
Popen object is created).


 
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