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pthread_mutex_unlock needs to use _rel semantics for atomic ops.

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This commit is contained in:
Ulrich Drepper 2009-07-27 13:46:56 -07:00
parent 052757bfa6
commit e73e694e38
2 changed files with 9 additions and 3 deletions
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6
nptl/ChangeLog
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@ -1,3 +1,9 @@
2009-07-27 Ulrich Drepper <drepper@redhat.com>
[BZ #10418]
* pthread_mutex_unlock.c (__pthread_mutex_unlock_full): Use _rel
instead of of _acq variants of cmpxchg.
2009-07-23 Ulrich Drepper <drepper@redhat.com>
* sysdeps/x86_64/configure.in: New file.

6
nptl/pthread_mutex_unlock.c
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@ -1,4 +1,4 @@
/* Copyright (C) 2002, 2003, 2005-2007, 2008 Free Software Foundation, Inc.
/* Copyright (C) 2002, 2003, 2005-2008, 2009 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
@ -213,7 +213,7 @@ __pthread_mutex_unlock_full (pthread_mutex_t *mutex, int decr)
/* Unlock. */
if ((mutex->__data.__lock & FUTEX_WAITERS) != 0
|| atomic_compare_and_exchange_bool_acq (&mutex->__data.__lock, 0,
|| atomic_compare_and_exchange_bool_rel (&mutex->__data.__lock, 0,
THREAD_GETMEM (THREAD_SELF,
tid)))
{
@ -263,7 +263,7 @@ __pthread_mutex_unlock_full (pthread_mutex_t *mutex, int decr)
oldval = mutex->__data.__lock;
newval = oldval & PTHREAD_MUTEX_PRIO_CEILING_MASK;
}
while (atomic_compare_and_exchange_bool_acq (&mutex->__data.__lock,
while (atomic_compare_and_exchange_bool_rel (&mutex->__data.__lock,
newval, oldval));
if ((oldval & ~PTHREAD_MUTEX_PRIO_CEILING_MASK) > 1)