Home | History | Annotate | Line # | Download | only in isc 
      1 /*	$NetBSD: atomic.h,v 1.9 2025/05/21 14:48:05 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_add_acq_rel(o, v) \
     69 	atomic_fetch_add_explicit((o), (v), memory_order_acq_rel)
     70 #define atomic_fetch_sub_acq_rel(o, v) \
     71 	atomic_fetch_sub_explicit((o), (v), memory_order_acq_rel)
     72 #define atomic_compare_exchange_weak_acq_rel(o, e, d) \
     73 	atomic_compare_exchange_weak_explicit(        \
     74 		(o), (e), (d), memory_order_acq_rel, memory_order_acquire)
     75 #define atomic_compare_exchange_strong_acq_rel(o, e, d) \
     76 	atomic_compare_exchange_strong_explicit(        \
     77 		(o), (e), (d), memory_order_acq_rel, memory_order_acquire)
     78 
     79 /* compare/exchange that MUST succeed */
     80 #define atomic_compare_exchange_enforced(o, e, d) \
     81 	RUNTIME_CHECK(atomic_compare_exchange_strong((o), (e), (d)))
     82 
     83 /* more comfortable atomic pointer declarations */
     84 #define atomic_ptr(type) _Atomic(type *)
     85