1/*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 1999,2000 Jonathan Lemon <jlemon@FreeBSD.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#ifndef _SYS_EVENTVAR_H_
30#define _SYS_EVENTVAR_H_
31
32#ifndef _KERNEL
33#error "no user-serviceable parts inside"
34#endif
35
36#include <sys/_task.h>
37
38#define KQ_NEVENTS	8		/* minimize copy{in,out} calls */
39#define KQEXTENT	256		/* linear growth by this amount */
40
41struct kqueue {
42	struct		mtx kq_lock;
43	int		kq_refcnt;
44	TAILQ_ENTRY(kqueue)	kq_list;
45	TAILQ_HEAD(, knote)	kq_head;	/* list of pending event */
46	int		kq_count;		/* number of pending events */
47	struct		selinfo kq_sel;
48	struct		sigio *kq_sigio;
49	struct		filedesc *kq_fdp;
50	int		kq_state;
51#define KQ_SEL		0x01
52#define KQ_SLEEP	0x02
53#define KQ_FLUXWAIT	0x04			/* waiting for a in flux kn */
54#define KQ_ASYNC	0x08
55#define KQ_CLOSING	0x10
56#define	KQ_TASKSCHED	0x20			/* task scheduled */
57#define	KQ_TASKDRAIN	0x40			/* waiting for task to drain */
58	int		kq_knlistsize;		/* size of knlist */
59	struct		klist *kq_knlist;	/* list of knotes */
60	u_long		kq_knhashmask;		/* size of knhash */
61	struct		klist *kq_knhash;	/* hash table for knotes */
62	struct		task kq_task;
63	struct		ucred *kq_cred;
64};
65
66#endif /* !_SYS_EVENTVAR_H_ */
67