atomic.h revision 38517 
1/*-
2 * Copyright (c) 1998 Doug Rabson
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. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
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 *	$Id$
27 */
28#ifndef _MACHINE_ATOMIC_H_
29#define _MACHINE_ATOMIC_H_
30
31/*
32 * Various simple arithmetic on memory which is atomic in the presence
33 * of interrupts.
34 *
35 * Note: these versions are not SMP safe.
36 */
37
38#define atomic_set_char(P, V)		(*(u_char*)(P) |= (V))
39#define atomic_clear_char(P, V)		(*(u_char*)(P) &= ~(V))
40#define atomic_add_char(P, V)		(*(u_char*)(P) += (V))
41#define atomic_subtract_char(P, V)	(*(u_char*)(P) -= (V))
42
43#define atomic_set_short(P, V)		(*(u_short*)(P) |= (V))
44#define atomic_clear_short(P, V)	(*(u_short*)(P) &= ~(V))
45#define atomic_add_short(P, V)		(*(u_short*)(P) += (V))
46#define atomic_subtract_short(P, V)	(*(u_short*)(P) -= (V))
47
48#define atomic_set_int(P, V)		(*(u_int*)(P) |= (V))
49#define atomic_clear_int(P, V)		(*(u_int*)(P) &= ~(V))
50#define atomic_add_int(P, V)		(*(u_int*)(P) += (V))
51#define atomic_subtract_int(P, V)	(*(u_int*)(P) -= (V))
52
53#define atomic_set_long(P, V)		(*(u_long*)(P) |= (V))
54#define atomic_clear_long(P, V)		(*(u_long*)(P) &= ~(V))
55#define atomic_add_long(P, V)		(*(u_long*)(P) += (V))
56#define atomic_subtract_long(P, V)	(*(u_long*)(P) -= (V))
57
58#endif /* ! _MACHINE_ATOMIC_H_ */
59