[issue7205] bz2file deadlock

[Robert Collins]

Robert Collins <robertc at robertcollins.net> added the comment:

On Mon, 2009-10-26 at 19:23 +0000, Antoine Pitrou wrote:
> Antoine Pitrou <pitrou at free.fr> added the comment:
> 
> Here is a patch.

Looks fine to me assuming that the locking functions can be used outside
the GIL.

On the test side, the case I supplied was low noise for me - I'd
hesitate to do as much compression as you are (50 times more) unless you
saw it spuriously pass a lot - the nature of the deadlock isn't
dependent on races so much as simple scheduling - as long as the seocnd
thread is scheduled before the first thread completes compressing the
deadlock will occur.

-Rob

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