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Add memory order constraints to C11 atomics 

Reduce the strength of the C11 atomics from memory_order_seq_cst to the
actually required memory order constraints for each operation. In
addition to reflecting the already documented memory order constraints,
this should allow for better code generation.
This commit is contained in:
Ben Wagner 2021-08-31 12:38:50 -04:00
parent 57032f489b
commit 6e68763085
1 changed files with 3 additions and 3 deletions
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6
src/fcatomic.h
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@ -57,11 +57,11 @@ typedef <type> fc_atomic_int_t;
typedef atomic_int fc_atomic_int_t;
#define FC_ATOMIC_INT_FORMAT "d"
#define fc_atomic_int_add(AI, V) atomic_fetch_add (&(AI), (V))
#define fc_atomic_int_add(AI, V) atomic_fetch_add_explicit (&(AI), (V), memory_order_acq_rel)
#define fc_atomic_ptr_get(P) atomic_load ((_Atomic(void *)*) (P))
#define fc_atomic_ptr_get(P) atomic_load_explicit ((_Atomic(void *)*) (P), memory_order_acquire)
static inline FcBool _fc_atomic_ptr_cmpexch(_Atomic(void *)*P, void * O, _Atomic(void *) N) {
return atomic_compare_exchange_strong(P, &O, N);
return atomic_compare_exchange_strong_explicit(P, &O, N, memory_order_release, memory_order_relaxed);
}
#define fc_atomic_ptr_cmpexch(P,O,N) _fc_atomic_ptr_cmpexch ((_Atomic(void *)*) (P), (O), (N))