Marcel Moolenaar e4f141b546 Work-around a race condition on ia64 while unlocking a contested lock.
The race condition is believed to be in UMTX_OP_MUTEX_WAKE. On ia64,
we simply go to the kernel to unlock.
The big question is why this is only a race condition on ia64...

MFC after:	3 days
2009-12-14 01:26:01 +00:00
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