[Bug nptl/32436] Unbalanced nwaiters counting in sem_wait

[schwab@linux-m68k.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=32436

Andreas Schwab <schwab@linux-m68k.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |INVALID
             Status|NEW                         |RESOLVED
             Blocks|12674                       |

--- Comment #1 from Andreas Schwab <schwab@linux-m68k.org> ---
The first atomic exchange will fail and reload the correct value from the
semaphore.  The only effect is that there is an extra loop iteration, but no
misbehaviour.


Referenced Bugs:

https://sourceware.org/bugzilla/show_bug.cgi?id=12674
[Bug 12674] sem_post/sem_wait race causing sem_post to return EINVAL
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