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Add explicit acquire/release semantics to MIPS' atomic_exchange_and_add.

This commit is contained in:
Maxim Kuvyrkov 2012-08-13 19:55:34 -07:00
parent 51a9ba860a
commit 8f12da9795
2 changed files with 24 additions and 9 deletions
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11
ports/ChangeLog.mips
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@ -1,3 +1,14 @@
2012-08-13 Maxim Kuvyrkov <maxim@codesourcery.com>
[__GNUC_PREREQ (4, 8)]
(atomic_exchange_and_add): Split into ...
(atomic_exchange_and_add_acq, atomic_exchange_and_add_rel): ... these.
New atomic macros.
[!__GNUC_PREREQ (4, 8)]
(atomic_exchange_and_add): Split into ...
(atomic_exchange_and_add_acq, atomic_exchange_and_add_rel): ... these.
New atomic macros.
2012-08-09 Joseph Myers <joseph@codesourcery.com>
* sysdeps/unix/sysv/linux/mips/kernel-features.h

22
ports/sysdeps/mips/bits/atomic.h
View File

@ -193,11 +193,13 @@ typedef uintmax_t uatomic_max_t;
__atomic_fetch_add (mem, value, model)
# endif
/* ??? Barrier semantics for atomic_exchange_and_add appear to be
undefined. Use full barrier for now, as that's safe. */
# define atomic_exchange_and_add(mem, value) \
# define atomic_exchange_and_add_acq(mem, value) \
__atomic_val_bysize (__arch_exchange_and_add, int, mem, value, \
__ATOMIC_ACQ_REL)
__ATOMIC_ACQUIRE)
# define atomic_exchange_and_add_rel(mem, value) \
__atomic_val_bysize (__arch_exchange_and_add, int, mem, value, \
__ATOMIC_RELEASE)
#else /* !__GNUC_PREREQ (4, 8) */
/* This implementation using inline assembly will be removed once glibc
requires GCC 4.8 or later to build. */
@ -434,11 +436,13 @@ typedef uintmax_t uatomic_max_t;
__prev; })
# endif
/* ??? Barrier semantics for atomic_exchange_and_add appear to be
undefined. Use full barrier for now, as that's safe. */
# define atomic_exchange_and_add(mem, value) \
__atomic_val_bysize (__arch_exchange_and_add, int, mem, value, \
MIPS_SYNC_STR, MIPS_SYNC_STR)
# define atomic_exchange_and_add_acq(mem, value) \
__atomic_val_bysize (__arch_exchange_and_add, int, mem, value, \
"", MIPS_SYNC_STR)
# define atomic_exchange_and_add_rel(mem, value) \
__atomic_val_bysize (__arch_exchange_and_add, int, mem, value, \
MIPS_SYNC_STR, "")
#endif /* __GNUC_PREREQ (4, 8) */
/* TODO: More atomic operations could be implemented efficiently; only the