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Add most useful relaxed and acquire-relase stdatomic convenience macros

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The header file <isc/atomic.h> now contains convenience macros for
most useful explicit memory ordering for C11 stdatomics, only relaxed
and acquire-release semantics is being used.  These macros SHOULD be
used instead of atomic_<func>_explicit functions.
This commit is contained in:
Ondřej Surý
2019-05-13 12:17:21 +07:00
parent 976d62aa23
commit ab389695b0
1 changed files with 33 additions and 4 deletions
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35
lib/isc/include/isc/atomic.h
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@@ -21,7 +21,36 @@
* We define a few additional macros to make things easier * We define a few additional macros to make things easier
*/ */
#define atomic_store_relaxed(o, v) atomic_store_explicit((o), \ /* Relaxed Memory Ordering */
(v), \
#define atomic_store_relaxed(o, v) \
atomic_store_explicit((o), (v), memory_order_relaxed)
#define atomic_load_relaxed(o) \
atomic_load_explicit((o), memory_order_relaxed)
#define atomic_fetch_add_relaxed(o, v) \
atomic_fetch_add_explicit((o), (v), memory_order_relaxed)
#define atomic_fetch_sub_relaxed(o, v) \
atomic_fetch_sub_explicit((o), (v), memory_order_relaxed)
#define atomic_exchange_relaxed(o, v) \
atomic_exchange_explicit((o), (v), memory_order_relaxed)
#define atomic_compare_exchange_weak_relaxed(o, e, d) \
atomic_compare_exchange_weak_explicit((o), (e), (d), \
memory_order_relaxed, \
memory_order_relaxed) memory_order_relaxed)
#define atomic_load_relaxed(o) atomic_load_explicit((o), memory_order_relaxed)
/* Acquire-Release Memory Ordering */
#define atomic_store_release(o, v) \
atomic_store_explicit((o), (v), memory_order_release)
#define atomic_load_acquire(o) \
atomic_load_explicit((o), memory_order_acquire)
#define atomic_fetch_add_acquire(o, v) \
atomic_fetch_add_explicit((o), (v), memory_order_acquire)
#define atomic_fetch_sub_release(o, v) \
atomic_fetch_sub_explicit((o), (v), memory_order_release)
#define atomic_exchange_acq_rel(o, v) \
atomic_exchange_explicit((o), (v), memory_order_acq_rel)
#define atomic_compare_exchange_weak_acq_rel(o, e, d) \
atomic_compare_exchange_weak_explicit((o), (e), (d), \
memory_order_acq_rel, \
memory_order_acquire)