Charles-Francois Natali <neolo...@free.fr> added the comment:

The most obvious explanation for that failure is that the barrier's timeout is 
too low.

   def test_default_timeout(self):
       """
       Test the barrier's default timeout
       """
       #create a barrier with a low default timeout
       barrier = self.barriertype(self.N, timeout=0.1)

If the last thread waits on the barrier more than 0.1s after the first thread, 
then you'll get a BrokenBarrierError.
A 0.1s delay is not that much, 100ms was the default quantum with Linux O(1) 
scheduler...

----------
nosy: +neologix

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue11871>
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