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Fri Apr 20 10:44:57 EDT 2001 · http://mail.python.org/pipermail/python-list/2001-April/073427.html

Hello,

I think I encountered a bug in Queue using python 1.5.2, and I was 
wondering if it was still around in python 2.x.

I have a Queue with infinite size that sometimes raises QueueFull 
exceptions when I use put_nowait.

The reason is that the fsema lock is acquired before the mutex lock, 
and it is possible for instance with 2 threads to have the first one 
take fsema and mutex, and then the second one trying to acquire fsema, 
and failing immediately (because it's in nowait mode), which causes a 
Full Queue exception. 

Is this still the case with later releases of Python?

TIA

Alexandre Fayolle
-- 
http://www.logilab.com 
Narval is the first software agent available as free software (GPL).
LOGILAB, Paris (France).

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bug with Queue in Python 1.5.2