[1.7] pthread_mutex_lock/pthread_mutex_unlock strange blocking problem

[Dave Korn]

Thomas Stalder wrote:
> Hello,
> 
> Sometimes pthread_mutex_lock ou pthread_mutex_unlock block.

  Thank you very much for the simple testcases.  I have located an invalid
racy optimisation in cygwin's internal lock handling that leads to a deadlock
owing to unmatched lock acquire/releases, and posted a patch combining that
with the fix for the previous deadlock at:

http://cygwin.com/ml/cygwin-patches/2009-q2/msg00068.html

  (As before, I could send you a DLL with the fix compiled in off-list for
testing if you like.)

    cheers,
      DaveK

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