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- Simplify the implementation of atomic_compare_exchange_strong_explicit.

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- Evaluate the memory order argument in atomic_fetch_*_explicit macros.
- Implement atomic_store_explicit using atomic_exchange_explicit instead
  of a plain assignment.

Reviewed by:	theraven
MFC after:	2 weeks
This commit is contained in:
Tijl Coosemans 2012-09-30 17:33:30 +00:00
parent 954c5baed9
commit f9f20af9ed
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=241077
1 changed files with 13 additions and 26 deletions
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39
include/stdatomic.h
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@ -234,19 +234,12 @@ typedef _Atomic(__uintmax_t) atomic_uintmax_t;
#else
#define atomic_compare_exchange_strong_explicit(object, expected, \
desired, success, failure) __extension__ ({ \
__typeof__((object)->__val) __v; \
__typeof__(expected) __e; \
_Bool __r; \
__e = (expected); \
(void)(success); \
(void)(failure); \
__v = __sync_val_compare_and_swap(&(object)->__val, \
*__e, (desired)); \
__r = (*__e == __v); \
*__e = __v; \
__r; \
__typeof__(expected) __ep = (expected); \
__typeof__(*__ep) __e = *__ep; \
(void)(success); (void)(failure); \
(*__ep = __sync_val_compare_and_swap(&(object)->__val, \
__e, desired)) == __e; \
})
#define atomic_compare_exchange_weak_explicit(object, expected, \
desired, success, failure) \
atomic_compare_exchange_strong_explicit(object, expected, \
@ -271,25 +264,19 @@ __extension__ ({ \
})
#endif
#define atomic_fetch_add_explicit(object, operand, order) \
__sync_fetch_and_add(&(object)->__val, operand)
((void)(order), __sync_fetch_and_add(&(object)->__val, operand))
#define atomic_fetch_and_explicit(object, operand, order) \
__sync_fetch_and_and(&(object)->__val, operand)
((void)(order), __sync_fetch_and_and(&(object)->__val, operand))
#define atomic_fetch_or_explicit(object, operand, order) \
__sync_fetch_and_or(&(object)->__val, operand)
((void)(order), __sync_fetch_and_or(&(object)->__val, operand))
#define atomic_fetch_sub_explicit(object, operand, order) \
__sync_fetch_and_sub(&(object)->__val, operand)
((void)(order), __sync_fetch_and_sub(&(object)->__val, operand))
#define atomic_fetch_xor_explicit(object, operand, order) \
__sync_fetch_and_xor(&(object)->__val, operand)
((void)(order), __sync_fetch_and_xor(&(object)->__val, operand))
#define atomic_load_explicit(object, order) \
__sync_fetch_and_add(&(object)->__val, 0)
#define atomic_store_explicit(object, desired, order) __extension__ ({ \
__typeof__(object) __o = (object); \
__typeof__(desired) __d = (desired); \
(void)(order); \
__sync_synchronize(); \
__o->__val = __d; \
__sync_synchronize(); \
})
((void)(order), __sync_fetch_and_add(&(object)->__val, 0))
#define atomic_store_explicit(object, desired, order) \
((void)atomic_exchange_explicit(object, desired, order))
#endif
/*