[issue7739] time.strftime may hung while trying to open /etc/localtime but does not release GIL

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

> I understand your last comment as wanting to keep the GIL while calling
> tzset(), but release it around the strftime() call.

Yes

> You still want to apply your patch, right?

http://sourceware.org/bugzilla/show_bug.cgi?id=4350 describes a crash. This issue is not a crash but a concurrency problem. I don't know if my patch fixes the initial problem: dorontal didn't try it and he doesn't explain us how to reproduce it.

I also not sure that releasing the GIL may not introduce a new concurrency issue: it might crash if a thread calls strftime() and another thread calls setenv("TZ", "...") (if I understood correctly the GNU libc bug 4350).

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<http://bugs.python.org/issue7739>
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