1/*-
 2 * SPDX-License-Identifier: BSD-4-Clause
 3 *
 4 * Copyright (c) 2005 David Xu <davidxu@freebsd.org>
 5 * Copyright (c) 1994 by Chris Provenzano, proven@mit.edu
 6 * All rights reserved.
 7 *
 8 * Redistribution and use in source and binary forms, with or without
 9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 *    must display the following acknowledgement:
18 *  This product includes software developed by Chris Provenzano.
19 * 4. The name of Chris Provenzano may not be used to endorse or promote
20 *    products derived from this software without specific prior written
21 *    permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY CHRIS PROVENZANO ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL CHRIS PROVENZANO BE LIABLE FOR ANY
27 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
28 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
29 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
30 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 *
35 * Description : Basic timers header.
36 */
37
38#ifndef _SYS_TIMERS_H_
39#define _SYS_TIMERS_H_
40
41#include <sys/time.h>
42
43#ifdef _KERNEL
44/*
45 * Structures used to manage POSIX timers in a process.
46 */
47struct itimer {
48	struct mtx  		it_mtx;
49	struct sigevent		it_sigev;
50	struct itimerspec	it_time;
51	struct proc 		*it_proc;
52	int	it_flags;
53	int	it_usecount;
54	int	it_overrun;		/* Overruns currently accumulating */
55	int	it_overrun_last;	/* Overruns associated w/ a delivery */
56	int	it_clockid;
57	ksiginfo_t	it_ksi;
58	struct callout it_callout;
59};
60
61#define	ITF_DELETING	0x01
62#define	ITF_WANTED	0x02
63#define	ITF_PSTOPPED	0x04
64
65#define	TIMER_MAX	32
66
67#define	ITIMER_LOCK(it)		mtx_lock(&(it)->it_mtx)
68#define	ITIMER_UNLOCK(it)	mtx_unlock(&(it)->it_mtx)
69
70struct	itimers {
71	struct itimer		*its_timers[TIMER_MAX];
72};
73
74struct	kclock {
75	int (*timer_create)(struct itimer *timer);
76	int (*timer_settime)(struct itimer * timer, int flags,
77		struct itimerspec * new_value,
78		struct itimerspec * old_value);
79	int (*timer_delete)(struct itimer * timer);
80	int (*timer_gettime)(struct itimer * timer,
81		struct itimerspec * cur_value);
82};
83
84void	itimers_exec(struct proc *p);
85void	itimers_exit(struct proc *p);
86int	itimer_accept(struct proc *p, int tid, ksiginfo_t *ksi);
87#endif
88#endif /* !_SYS_TIMERS_H_ */