1/*-
2 * Copyright (c) 1999,2000 Jonathan Lemon <jlemon@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 *	$FreeBSD$
27 */
28
29#ifndef _SYS_EVENTVAR_H_
30#define _SYS_EVENTVAR_H_
31
32#ifndef _KERNEL
33#error "no user-servicable 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};
64
65#endif /* !_SYS_EVENTVAR_H_ */
66