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To: python-list@python.org
From: Ned Deily <nad@acm.org>
Subject: Re: MacOS 10.9.2: threading error using python.org 2.7.6 distribution
Date: Fri, 25 Apr 2014 11:58:56 -0700
References: <a087ae04-a87c-4e77-a7dd-2d883d30a6f0@googlegroups.com> <CAPTjJmpXuj9N3cdQcH0oJaVkSfVrqJWHH1GSt3FafkcGyw54Ag@mail.gmail.com>
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Xref: csiph.com comp.lang.python:70615

In article 
<CAPTjJmpXuj9N3cdQcH0oJaVkSfVrqJWHH1GSt3FafkcGyw54Ag@mail.gmail.com>,
 Chris Angelico <rosuav@gmail.com> wrote:

> On Fri, Apr 25, 2014 at 11:43 PM, Matthew Pounsett
> <matt.pounsett@gmail.com> wrote:
> > If I insert that object into the test code and run it instead of 
> > MyThread(), I get the error.  I can't see anything in there that should 
> > cause problems for the threading module though... especially since this 
> > runs fine on another system with the same version of python.
> >
> > Any thoughts on what's going on here?
> 
> First culprit I'd look at is the mixing of subprocess and threading.
> It's entirely possible that something goes messy when you fork from a
> thread.

FWIW, the Python 2 version of subprocess is known to be thread-unsafe.  
There is a Py2 backport available on PyPI of the improved Python 3 
subprocess module:

http://bugs.python.org/issue20318
https://pypi.python.org/pypi/subprocess32/

-- 
 Ned Deily,
 nad@acm.org