1/*	$NetBSD: condvar.h,v 1.17 2020/05/11 03:59:33 riastradh 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_ */