1 /* $NetBSD: atomic.h,v 1.8 2025/01/26 16:25:40 christos Exp $ */ 2 3 /* 4 * Copyright (C) Internet Systems Consortium, Inc. ("ISC") 5 * 6 * SPDX-License-Identifier: MPL-2.0 7 * 8 * This Source Code Form is subject to the terms of the Mozilla Public 9 * License, v. 2.0. If a copy of the MPL was not distributed with this 10 * file, you can obtain one at https://mozilla.org/MPL/2.0/. 11 * 12 * See the COPYRIGHT file distributed with this work for additional 13 * information regarding copyright ownership. 14 */ 15 16 #pragma once 17 18 #include <stdatomic.h> 19 #ifdef __lint__ 20 # include <isc/lint-atomic.h> 21 #endif 22 23 #include <isc/util.h> 24 25 /* 26 * We define a few additional macros to make things easier 27 */ 28 29 /* Relaxed Memory Ordering */ 30 31 #define atomic_store_relaxed(o, v) \ 32 atomic_store_explicit((o), (v), memory_order_relaxed) 33 #define atomic_load_relaxed(o) atomic_load_explicit((o), memory_order_relaxed) 34 #define atomic_fetch_add_relaxed(o, v) \ 35 atomic_fetch_add_explicit((o), (v), memory_order_relaxed) 36 #define atomic_fetch_sub_relaxed(o, v) \ 37 atomic_fetch_sub_explicit((o), (v), memory_order_relaxed) 38 #define atomic_fetch_or_relaxed(o, v) \ 39 atomic_fetch_or_explicit((o), (v), memory_order_relaxed) 40 #define atomic_fetch_and_relaxed(o, v) \ 41 atomic_fetch_and_explicit((o), (v), memory_order_relaxed) 42 #define atomic_exchange_relaxed(o, v) \ 43 atomic_exchange_explicit((o), (v), memory_order_relaxed) 44 #define atomic_compare_exchange_weak_relaxed(o, e, d) \ 45 atomic_compare_exchange_weak_explicit( \ 46 (o), (e), (d), memory_order_relaxed, memory_order_relaxed) 47 #define atomic_compare_exchange_strong_relaxed(o, e, d) \ 48 atomic_compare_exchange_strong_explicit( \ 49 (o), (e), (d), memory_order_relaxed, memory_order_relaxed) 50 51 /* Acquire-Release Memory Ordering */ 52 53 #define atomic_store_release(o, v) \ 54 atomic_store_explicit((o), (v), memory_order_release) 55 #define atomic_load_acquire(o) atomic_load_explicit((o), memory_order_acquire) 56 #define atomic_fetch_add_release(o, v) \ 57 atomic_fetch_add_explicit((o), (v), memory_order_release) 58 #define atomic_fetch_sub_release(o, v) \ 59 atomic_fetch_sub_explicit((o), (v), memory_order_release) 60 #define atomic_fetch_and_release(o, v) \ 61 atomic_fetch_and_explicit((o), (v), memory_order_release) 62 #define atomic_fetch_or_release(o, v) \ 63 atomic_fetch_or_explicit((o), (v), memory_order_release) 64 #define atomic_exchange_acquire(o, v) \ 65 atomic_exchange_explicit((o), (v), memory_order_acquire) 66 #define atomic_exchange_acq_rel(o, v) \ 67 atomic_exchange_explicit((o), (v), memory_order_acq_rel) 68 #define atomic_fetch_sub_acq_rel(o, v) \ 69 atomic_fetch_sub_explicit((o), (v), memory_order_acq_rel) 70 #define atomic_compare_exchange_weak_acq_rel(o, e, d) \ 71 atomic_compare_exchange_weak_explicit( \ 72 (o), (e), (d), memory_order_acq_rel, memory_order_acquire) 73 #define atomic_compare_exchange_strong_acq_rel(o, e, d) \ 74 atomic_compare_exchange_strong_explicit( \ 75 (o), (e), (d), memory_order_acq_rel, memory_order_acquire) 76 77 /* compare/exchange that MUST succeed */ 78 #define atomic_compare_exchange_enforced(o, e, d) \ 79 RUNTIME_CHECK(atomic_compare_exchange_strong((o), (e), (d))) 80 81 /* more comfortable atomic pointer declarations */ 82 #define atomic_ptr(type) _Atomic(type *) 83