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Add explicit acquire/release semantics to atomic_exchange_and_add.

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This commit is contained in:
Maxim Kuvyrkov 2012-08-13 19:31:00 -07:00
parent cc184e11fe
commit 51a9ba860a
2 changed files with 22 additions and 2 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
2012-08-13 Maxim Kuvyrkov <maxim@codesourcery.com>
* include/atomic.h (atomic_exchange_and_add): Split into ...
(atomic_exchange_and_add_acq, atomic_exchange_and_add_rel): ... these.
New atomic macros.
2012-08-13 Markus Trippelsdorf <markus@trippelsdorf.de>
* sysdeps/x86_64/fpu/libm-test-ulps: Update.

18
include/atomic.h
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@ -198,8 +198,12 @@
/* Add VALUE to *MEM and return the old value of *MEM. */
#ifndef atomic_exchange_and_add
# define atomic_exchange_and_add(mem, value) \
#ifndef atomic_exchange_and_add_acq
# ifdef atomic_exchange_and_add
# define atomic_exchange_and_add_acq(mem, value) \
atomic_exchange_and_add (mem, value)
# else
# define atomic_exchange_and_add_acq(mem, value) \
({ __typeof (*(mem)) __atg6_oldval; \
__typeof (mem) __atg6_memp = (mem); \
__typeof (*(mem)) __atg6_value = (value); \
@ -213,8 +217,18 @@
__atg6_oldval), 0)); \
\
__atg6_oldval; })
# endif
#endif
#ifndef atomic_exchange_and_add_rel
# define atomic_exchange_and_add_rel(mem, value) \
atomic_exchange_and_add_acq(mem, value)
#endif
#ifndef atomic_exchange_and_add
# define atomic_exchange_and_add(mem, value) \
atomic_exchange_and_add_acq(mem, value)
#endif
#ifndef catomic_exchange_and_add
# define catomic_exchange_and_add(mem, value) \