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(atomic_decrement_if_positive): Adjust for the correct atomic_compare_and_exchange_acq semantics.

This commit is contained in:
Ulrich Drepper 2003-03-20 19:42:54 +00:00
parent f1f8a9ec6f
commit 972209dd7a
1 changed files with 9 additions and 10 deletions
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19
include/atomic.h
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@ -113,22 +113,21 @@
/* Decrement *MEM if it is > 0, and return the old value. */ /* Decrement *MEM if it is > 0, and return the old value. */
#ifndef atomic_decrement_if_positive #ifndef atomic_decrement_if_positive
# define atomic_decrement_if_positive(mem) \ # define atomic_decrement_if_positive(mem) \
({ __typeof (*mem) __val; \ ({ __typeof (*mem) __oldval; \
__typeof (*mem) __oldval; \
__typeof (mem) __memp; \ __typeof (mem) __memp; \
\ \
__val = *__memp; \ __val = *__memp; \
do \ do \
{ \ { \
if (__builtin_expect (__val <= 0, 0)) \ __oldval = *__memp; \
if (__builtin_expect (__oldval <= 0, 0)) \
break; \ break; \
__oldval = __val; \
__val = atomic_compare_and_exchange_acq (__memp, __oldval - 1, \
__oldval); \
} \ } \
while (__builtin_expect (__val != __oldval, 0)); \ while (__builtin_expect (atomic_compare_and_exchange_acq (__memp, \
__val; }) __oldval - 1, \
__oldval), 0));\
__oldval; })
#endif #endif