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 
36 uint32_t
37 atomic_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
50 atomic_op_alias(atomic_add_32_nv,_atomic_add_32_nv)
51 
52 #undef atomic_add_int_nv
53 atomic_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
58 atomic_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
62 atomic_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