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Use a relaxed memory ordering in dav1d_ref_inc()

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Increasing a reference counter only requires atomicity, but not
ordering or synchronization.
This commit is contained in:
Henrik Gramner
2022-04-28 16:17:08 +02:00
committed by Henrik Gramner
co-authored by Henrik Gramner
parent 6d0d066654
commit 601bfe21b7
3 changed files with 3 additions and 1 deletions
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include/compat/gcc/stdatomic.h
+1
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@@ -40,6 +40,7 @@ typedef unsigned int atomic_uint;
#define atomic_load(p_a) __atomic_load_n(p_a, __ATOMIC_SEQ_CST)
#define atomic_load_explicit(p_a, mo) __atomic_load_n(p_a, mo)
#define atomic_fetch_add(p_a, inc) __atomic_fetch_add(p_a, inc, __ATOMIC_SEQ_CST)
#define atomic_fetch_add_explicit(p_a, inc, mo) __atomic_fetch_add(p_a, inc, mo)
#define atomic_fetch_sub(p_a, dec) __atomic_fetch_sub(p_a, dec, __ATOMIC_SEQ_CST)
#define atomic_exchange(p_a, v) __atomic_exchange_n(p_a, v, __ATOMIC_SEQ_CST)
#define atomic_fetch_or(p_a, v) __atomic_fetch_or(p_a, v, __ATOMIC_SEQ_CST)
include/compat/msvc/stdatomic.h
+1
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@@ -62,6 +62,7 @@ typedef enum {
#define atomic_fetch_add(p_a, inc) InterlockedExchangeAdd(p_a, inc)
#define atomic_fetch_sub(p_a, dec) InterlockedExchangeAdd(p_a, -(dec))
#define atomic_fetch_or(p_a, v) InterlockedOr(p_a, v)
#define atomic_fetch_add_explicit(p_a, inc, mo) atomic_fetch_add(p_a, inc)
#endif /* ! stdatomic.h */
src/ref.h
+1 -1
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@@ -54,7 +54,7 @@ void dav1d_ref_dec(Dav1dRef **ref);
int dav1d_ref_is_writable(Dav1dRef *ref);
static inline void dav1d_ref_inc(Dav1dRef *const ref) {
atomic_fetch_add(&ref->ref_cnt, 1);
atomic_fetch_add_explicit(&ref->ref_cnt, 1, memory_order_relaxed);
}
#endif /* DAV1D_SRC_REF_H */