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atomic.h
1/* Atomic operations */
2/* SPDX-FileCopyrightText: Copyright © 2023 Wim Taymans */
3/* SPDX-License-Identifier: MIT */
4
5#ifndef SPA_ATOMIC_H
6#define SPA_ATOMIC_H
7
8#ifdef __cplusplus
9 extern "C" {
10#endif
11
12#define SPA_ATOMIC_CAS(v,ov,nv) \
13({ \
14 __typeof__(v) __ov = (ov); \
15 __atomic_compare_exchange_n(&(v), &__ov, (nv), \
16 0, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST); \
17})
18
19#define SPA_ATOMIC_DEC(s) __atomic_sub_fetch(&(s), 1, __ATOMIC_SEQ_CST)
20#define SPA_ATOMIC_INC(s) __atomic_add_fetch(&(s), 1, __ATOMIC_SEQ_CST)
21#define SPA_ATOMIC_LOAD(s) __atomic_load_n(&(s), __ATOMIC_SEQ_CST)
22#define SPA_LOAD_ONCE(s) __atomic_load_n(&(s), __ATOMIC_RELAXED)
23#define SPA_STORE_ONCE(s,v) __atomic_store_n(&(s), (v), __ATOMIC_RELAXED)
24#define SPA_ATOMIC_STORE(s,v) __atomic_store_n(&(s), (v), __ATOMIC_SEQ_CST)
25#define SPA_ATOMIC_XCHG(s,v) __atomic_exchange_n(&(s), (v), __ATOMIC_SEQ_CST)
26
27#define SPA_SEQ_WRITE(s) SPA_ATOMIC_INC(s)
28#define SPA_SEQ_WRITE_SUCCESS(s1,s2) ((s1) + 1 == (s2) && ((s2) & 1) == 0)
29
30#define SPA_SEQ_READ(s) SPA_ATOMIC_LOAD(s)
31#define SPA_SEQ_READ_SUCCESS(s1,s2) ((s1) == (s2) && ((s2) & 1) == 0)
32
33#ifdef __cplusplus
34} /* extern "C" */
35#endif
36
37#endif /* SPA_ATOMIC_H */