Author: emaste
Date: Sat Aug 17 19:34:41 2013
New Revision: 254465
URL: http://svnweb.freebsd.org/changeset/base/254465
Log:
Correct implementation of atomic_flag_test_and_set
The function sets the flag and returns the previous value (7.17.8.1).
Modified:
head/sys/sys/stdatomic.h
Modified: head/sys/sys/stdatomic.h
==============================================================================
--- head/sys/sys/stdatomic.h Sat Aug 17 19:29:51 2013 (r254464)
+++ head/sys/sys/stdatomic.h Sat Aug 17 19:34:41 2013 (r254465)
@@ -381,11 +381,7 @@ static __inline _Bool
atomic_flag_test_and_set_explicit(volatile atomic_flag *__object,
memory_order __order)
{
- _Bool __expected;
-
- __expected = 0;
- return (atomic_compare_exchange_strong_explicit(&__object->__flag,
- &__expected, 1, __order, __order));
+ return (atomic_exchange_explicit(&__object->__flag, 1, __order));
}
static __inline void
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