1/* $OpenBSD: mplock.h,v 1.14 2024/07/03 01:36:50 jsg Exp $ */
2
3/*
4 * Copyright (c) 2004 Niklas Hallqvist. All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#ifndef _MPLOCK_H_
28#define _MPLOCK_H_
29
30#include <machine/mplock.h>
31
32#ifdef __USE_MI_MPLOCK
33
34#include <sys/_lock.h>
35
36struct __mp_lock_cpu {
37 u_int mplc_ticket;
38 u_int mplc_depth;
39};
40
41struct __mp_lock {
42 struct __mp_lock_cpu mpl_cpus[MAXCPUS];
43 volatile u_int mpl_ticket;
44 u_int mpl_users;
45#ifdef WITNESS
46 struct lock_object mpl_lock_obj;
47#endif
48};
49
50void ___mp_lock_init(struct __mp_lock *, const struct lock_type *);
51void __mp_lock(struct __mp_lock *);
52void __mp_unlock(struct __mp_lock *);
53int __mp_release_all(struct __mp_lock *);
54void __mp_acquire_count(struct __mp_lock *, int);
55int __mp_lock_held(struct __mp_lock *, struct cpu_info *);
56
57#ifdef WITNESS
58
59#define __mp_lock_init(mpl) do { \
60 static const struct lock_type __lock_type = { .lt_name = #mpl };\
61 ___mp_lock_init((mpl), &__lock_type); \
62} while (0)
63
64#else /* WITNESS */
65
66#define __mp_lock_init(mpl) ___mp_lock_init((mpl), NULL)
67
68#endif /* WITNESS */
69
70#endif /* __USE_MI_MPLOCK */
71
72extern struct __mp_lock kernel_lock;
73
74#endif /* !_MPLOCK_H */