svn commit: r200622 - stable/8/lib/libthr/thread
Marcel Moolenaar
marcel at FreeBSD.org
Thu Dec 17 02:06:07 UTC 2009
Author: marcel
Date: Thu Dec 17 02:06:07 2009
New Revision: 200622
URL: http://svn.freebsd.org/changeset/base/200622
Log:
MFC rev 200498:
Work-around a race condition on ia64 while unlocking a contested lock.
Modified:
stable/8/lib/libthr/thread/thr_umtx.c
Directory Properties:
stable/8/lib/libthr/ (props changed)
Modified: stable/8/lib/libthr/thread/thr_umtx.c
==============================================================================
--- stable/8/lib/libthr/thread/thr_umtx.c Thu Dec 17 00:22:56 2009 (r200621)
+++ stable/8/lib/libthr/thread/thr_umtx.c Thu Dec 17 02:06:07 2009 (r200622)
@@ -112,10 +112,13 @@ __thr_umutex_timedlock(struct umutex *mt
int
__thr_umutex_unlock(struct umutex *mtx, uint32_t id)
{
+#ifndef __ia64__
+ /* XXX this logic has a race-condition on ia64. */
if ((mtx->m_flags & (UMUTEX_PRIO_PROTECT | UMUTEX_PRIO_INHERIT)) == 0) {
atomic_cmpset_rel_32(&mtx->m_owner, id | UMUTEX_CONTESTED, UMUTEX_CONTESTED);
return _umtx_op_err(mtx, UMTX_OP_MUTEX_WAKE, 0, 0, 0);
}
+#endif /* __ia64__ */
return _umtx_op_err(mtx, UMTX_OP_MUTEX_UNLOCK, 0, 0, 0);
}
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