Author: davidxu
Date: Mon Jan 16 06:15:14 2012
New Revision: 230201
URL: http://svn.freebsd.org/changeset/base/230201
Log:
Insert read memory barriers.
Modified:
head/lib/libc/gen/sem.c
head/lib/libc/gen/sem_new.c
Modified: head/lib/libc/gen/sem.c
==============================================================================
--- head/lib/libc/gen/sem.c Mon Jan 16 06:00:44 2012 (r230200)
+++ head/lib/libc/gen/sem.c Mon Jan 16 06:15:14 2012 (r230201)
@@ -434,7 +434,7 @@ _libc_sem_post_compat(sem_t *sem)
return ksem_post((*sem)->semid);
atomic_add_rel_int(&(*sem)->count, 1);
-
+ rmb();
if ((*sem)->nwaiters)
return _umtx_wake(&(*sem)->count);
return (0);
Modified: head/lib/libc/gen/sem_new.c
==============================================================================
--- head/lib/libc/gen/sem_new.c Mon Jan 16 06:00:44 2012 (r230200)
+++ head/lib/libc/gen/sem_new.c Mon Jan 16 06:15:14 2012 (r230201)
@@ -332,6 +332,7 @@ _sem_getvalue(sem_t * __restrict sem, in
static __inline int
usem_wake(struct _usem *sem)
{
+ rmb();
if (!sem->_has_waiters)
return (0);
return _umtx_op(sem, UMTX_OP_SEM_WAKE, 0, NULL, NULL);
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