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
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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: head/sys/i386/include/atomic.h 177276 2008-03-16 21:20:50Z pjd $
27 */
28#ifndef _MACHINE_ATOMIC_H_
29#define _MACHINE_ATOMIC_H_
30
31#ifndef _SYS_CDEFS_H_
32#error this file needs sys/cdefs.h as a prerequisite
33#endif
34
35/*
36 * Various simple operations on memory, each of which is atomic in the
37 * presence of interrupts and multiple processors.
38 *
39 * atomic_set_char(P, V) (*(u_char *)(P) |= (V))
40 * atomic_clear_char(P, V) (*(u_char *)(P) &= ~(V))
41 * atomic_add_char(P, V) (*(u_char *)(P) += (V))
42 * atomic_subtract_char(P, V) (*(u_char *)(P) -= (V))
43 *
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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 unchanged lines hidden (view full) ---
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: head/sys/i386/include/atomic.h 177276 2008-03-16 21:20:50Z pjd $
27 */
28#ifndef _MACHINE_ATOMIC_H_
29#define _MACHINE_ATOMIC_H_
30
31#ifndef _SYS_CDEFS_H_
32#error this file needs sys/cdefs.h as a prerequisite
33#endif
34
35/*
36 * Various simple operations on memory, each of which is atomic in the
37 * presence of interrupts and multiple processors.
38 *
39 * atomic_set_char(P, V) (*(u_char *)(P) |= (V))
40 * atomic_clear_char(P, V) (*(u_char *)(P) &= ~(V))
41 * atomic_add_char(P, V) (*(u_char *)(P) += (V))
42 * atomic_subtract_char(P, V) (*(u_char *)(P) -= (V))
43 *
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