1/* $NetBSD: condvar.h,v 1.19 2023/11/02 10:31:55 martin Exp $ */
2
3/*-
4 * Copyright (c) 2006, 2007, 2008, 2020 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Andrew Doran.
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#ifndef _SYS_CONDVAR_H_
33#define _SYS_CONDVAR_H_
34
35typedef struct kcondvar {
36 void *cv_opaque[2];
37} kcondvar_t;
38
39#ifdef _KERNEL
40
41struct bintime;
42struct kmutex;
43struct timespec;
44
45void cv_init(kcondvar_t *, const char *);
46void cv_destroy(kcondvar_t *);
47
48void cv_wait(kcondvar_t *, struct kmutex *);
49int cv_wait_sig(kcondvar_t *, struct kmutex *);
50int cv_timedwait(kcondvar_t *, struct kmutex *, int);
51int cv_timedwait_sig(kcondvar_t *, struct kmutex *, int);
52int cv_timedwaitbt(kcondvar_t *, struct kmutex *, struct bintime *,
53 const struct bintime *);
54int cv_timedwaitbt_sig(kcondvar_t *, struct kmutex *, struct bintime *,
55 const struct bintime *);
56
57void cv_signal(kcondvar_t *);
58void cv_broadcast(kcondvar_t *);
59
60bool cv_has_waiters(kcondvar_t *);
61bool cv_is_valid(kcondvar_t *);
62
63/* The "lightning bolt", awoken once per second by the clock interrupt. */
64extern kcondvar_t lbolt;
65
66#endif /* _KERNEL */
67
68#endif /* _SYS_CONDVAR_H_ */