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/* $NetBSD: atomic_is_lock_free.c,v 1.3 2023/04/03 16:45:46 riastradh 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 <sys/cdefs.h>
__RCSID("$NetBSD: atomic_is_lock_free.c,v 1.3 2023/04/03 16:45:46 riastradh Exp $");
#include <sys/types.h>
#include <sys/stdbool.h>
/*
* 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;
}
}
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