1/*-
2 * Copyright (c) 2001 Daniel Eischen <deischen@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Neither the name of the author nor the names of its contributors
11 *    may be used to endorse or promote products derived from this software
12 *    without specific prior written permission.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD$
27 */
28
29#ifndef	_ATOMIC_OPS_H_
30#define	_ATOMIC_OPS_H_
31
32#include <machine/atomic.h>
33#include "thr_private.h"
34
35/*
36 * Atomic swap:
37 *   Atomic (tmp = *dst, *dst = val), then *res = tmp
38 *
39 * void atomic_swap32(intptr_t *dst, intptr_t val, intptr_t *res);
40 */
41static inline void
42atomic_swap32(volatile intptr_t *dst, intptr_t val, intptr_t *res)
43{
44	*res = __swp(val, dst);
45}
46
47#define	atomic_swap_ptr(d, v, r) \
48	atomic_swap32((volatile intptr_t *)d, (intptr_t)v, (intptr_t *)r)
49
50#define	atomic_swap_int(d, v, r) \
51	atomic_swap32((volatile intptr_t *)d, (intptr_t)v, (intptr_t *)r)
52#endif
53
54