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atomic.h
/* Atomic operations */
/* SPDX-FileCopyrightText: Copyright © 2023 Wim Taymans */
/* SPDX-License-Identifier: MIT */
#ifndef SPA_ATOMIC_H
#define SPA_ATOMIC_H
#ifdef __cplusplus
extern "C" {
#endif
#define SPA_ATOMIC_CAS(v,ov,nv) \
({ \
__typeof__(v) __ov = (ov); \
__atomic_compare_exchange_n(&(v), &__ov, (nv), \
0, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST); \
})
#define SPA_ATOMIC_DEC(s) __atomic_sub_fetch(&(s), 1, __ATOMIC_SEQ_CST)
#define SPA_ATOMIC_INC(s) __atomic_add_fetch(&(s), 1, __ATOMIC_SEQ_CST)
#define SPA_ATOMIC_LOAD(s) __atomic_load_n(&(s), __ATOMIC_SEQ_CST)
#define SPA_LOAD_ONCE(s) __atomic_load_n(&(s), __ATOMIC_RELAXED)
#define SPA_STORE_ONCE(s,v) __atomic_store_n(&(s), (v), __ATOMIC_RELAXED)
#define SPA_ATOMIC_STORE(s,v) __atomic_store_n(&(s), (v), __ATOMIC_SEQ_CST)
#define SPA_ATOMIC_XCHG(s,v) __atomic_exchange_n(&(s), (v), __ATOMIC_SEQ_CST)
#define SPA_SEQ_WRITE(s) SPA_ATOMIC_INC(s)
#define SPA_SEQ_WRITE_SUCCESS(s1,s2) ((s1) + 1 == (s2) && ((s2) & 1) == 0)
#define SPA_SEQ_READ(s) SPA_ATOMIC_LOAD(s)
#define SPA_SEQ_READ_SUCCESS(s1,s2) ((s1) == (s2) && ((s2) & 1) == 0)
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif /* SPA_ATOMIC_H */