/* $NetBSD: atomic_is_lock_free.c,v 1.3.2.3 2023/12/14 17:49:40 martin Exp $ */ /*- * Copyright (c) 2023 The NetBSD Foundation, Inc. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #include __RCSID("$NetBSD: atomic_is_lock_free.c,v 1.3.2.3 2023/12/14 17:49:40 martin Exp $"); #include #include /* * XXX Work around clang's built-in __atomic_is_lock_free by having the * C name be different but using an asm rename to define the right * symbol. */ bool __atomic_is_lock_free_hack(size_t, const volatile void *) __RENAME(__atomic_is_lock_free); #define __atomic_is_lock_free __atomic_is_lock_free_hack bool __atomic_is_lock_free(size_t n, const volatile void *p __unused) { switch (n) { case 1: return __atomic_always_lock_free(1, 0); case 2: return __atomic_always_lock_free(2, 0); case 4: return __atomic_always_lock_free(4, 0); case 8: return __atomic_always_lock_free(8, 0); case 16: return __atomic_always_lock_free(16, 0); default: return false; } }