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Add atomic_exchange_relaxed.

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* include/atomic.h (atomic_exchange_relaxed): New.
This commit is contained in:
Torvald Riegel
2016-07-21 14:31:28 +02:00
parent cb864fe0ec
commit f0e3925bf3
2 changed files with 13 additions and 0 deletions
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9
include/atomic.h
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@@ -588,6 +588,9 @@ void __atomic_link_error (void);
__atomic_compare_exchange_n ((mem), (expected), (desired), 1, \
__ATOMIC_RELEASE, __ATOMIC_RELAXED); })
# define atomic_exchange_relaxed(mem, desired) \
({ __atomic_check_size((mem)); \
__atomic_exchange_n ((mem), (desired), __ATOMIC_RELAXED); })
# define atomic_exchange_acquire(mem, desired) \
({ __atomic_check_size((mem)); \
__atomic_exchange_n ((mem), (desired), __ATOMIC_ACQUIRE); })
@@ -684,6 +687,12 @@ void __atomic_link_error (void);
*(expected) == __atg103_expected; })
# endif
/* XXX Fall back to acquire MO because archs do not define a weaker
atomic_exchange. */
# ifndef atomic_exchange_relaxed
# define atomic_exchange_relaxed(mem, val) \
atomic_exchange_acq ((mem), (val))
# endif
# ifndef atomic_exchange_acquire
# define atomic_exchange_acquire(mem, val) \
atomic_exchange_acq ((mem), (val))