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/* SPDX-License-Identifier: GPL-2.0+ OR Apache-2.0 */
/*
* Copyright (C) 2024 Alibaba Cloud
*/
#ifndef __EROFS_ATOMIC_H
#define __EROFS_ATOMIC_H
/*
* Just use GCC/clang built-in functions for now
* See: https://gcc.gnu.org/onlinedocs/gcc/_005f_005fatomic-Builtins.html
*/
typedef unsigned long erofs_atomic_t;
typedef char erofs_atomic_bool_t;
#define erofs_atomic_read(ptr) ({ \
typeof(*ptr) __n; \
__atomic_load(ptr, &__n, __ATOMIC_RELAXED); \
__n;})
#define erofs_atomic_set(ptr, n) do { \
typeof(*ptr) __n = (n); \
__atomic_store(ptr, &__n, __ATOMIC_RELAXED); \
} while(0)
#define erofs_atomic_set_bit(bit, ptr) do { \
typeof(*ptr) __n = (1 << bit); \
__atomic_or_fetch(ptr, __n, __ATOMIC_ACQ_REL); \
} while(0)
#define erofs_atomic_test_and_set(ptr) \
__atomic_test_and_set(ptr, __ATOMIC_RELAXED)
#define erofs_atomic_add_return(ptr, i) \
__atomic_add_fetch(ptr, i, __ATOMIC_RELAXED)
#define erofs_atomic_sub_return(ptr, i) \
__atomic_sub_fetch(ptr, i, __ATOMIC_RELAXED)
#define erofs_atomic_inc_return(ptr) erofs_atomic_add_return(ptr, 1)
#define erofs_atomic_dec_return(ptr) erofs_atomic_sub_return(ptr, 1)
#endif
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