1/*	$NetBSD: atomic_add_32_nv_cas.c,v 1.4 2008/04/28 20:22:52 martin Exp $	*/
2
3/*-
4 * Copyright (c) 2007 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Jason R. Thorpe.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#include "atomic_op_namespace.h"
33
34#include <sys/atomic.h>
35
36uint32_t
37atomic_add_32_nv(volatile uint32_t *addr, int32_t val)
38{
39	uint32_t old, new;
40
41	do {
42		old = *addr;
43		new = old + val;
44	} while (atomic_cas_32(addr, old, new) != old);
45
46	return (new);
47}
48
49#undef atomic_add_32_nv
50atomic_op_alias(atomic_add_32_nv,_atomic_add_32_nv)
51
52#undef atomic_add_int_nv
53atomic_op_alias(atomic_add_int_nv,_atomic_add_32_nv)
54__strong_alias(_atomic_add_int_nv,_atomic_add_32_nv)
55
56#if !defined(_LP64)
57#undef atomic_add_long_nv
58atomic_op_alias(atomic_add_long_nv,_atomic_add_32_nv)
59__strong_alias(_atomic_add_long_nv,_atomic_add_32_nv)
60
61#undef atomic_add_ptr_nv
62atomic_op_alias(atomic_add_ptr_nv,_atomic_add_32_nv)
63__strong_alias(_atomic_add_ptr_nv,_atomic_add_32_nv)
64#endif /* _LP64 */
65