1 /* SPDX-License-Identifier: GPL-2.0+ OR Apache-2.0 */ 2 /* 3 * Copyright (C) 2024 Alibaba Cloud 4 */ 5 #ifndef __EROFS_ATOMIC_H 6 #define __EROFS_ATOMIC_H 7 8 /* 9 * Just use GCC/clang built-in functions for now 10 * See: https://gcc.gnu.org/onlinedocs/gcc/_005f_005fatomic-Builtins.html 11 */ 12 typedef unsigned long erofs_atomic_t; 13 typedef char erofs_atomic_bool_t; 14 15 #define erofs_atomic_read(ptr) ({ \ 16 typeof(*ptr) __n; \ 17 __atomic_load(ptr, &__n, __ATOMIC_RELAXED); \ 18 __n;}) 19 20 #define erofs_atomic_set(ptr, n) do { \ 21 typeof(*ptr) __n = (n); \ 22 __atomic_store(ptr, &__n, __ATOMIC_RELAXED); \ 23 } while(0) 24 25 #define erofs_atomic_test_and_set(ptr) \ 26 __atomic_test_and_set(ptr, __ATOMIC_RELAXED) 27 28 #define erofs_atomic_add_return(ptr, i) \ 29 __atomic_add_fetch(ptr, i, __ATOMIC_RELAXED) 30 31 #define erofs_atomic_sub_return(ptr, i) \ 32 __atomic_sub_fetch(ptr, i, __ATOMIC_RELAXED) 33 34 #define erofs_atomic_inc_return(ptr) erofs_atomic_add_return(ptr, 1) 35 36 #define erofs_atomic_dec_return(ptr) erofs_atomic_sub_return(ptr, 1) 37 38 #endif 39