1/* $OpenBSD: eventvar.h,v 1.17 2022/07/09 12:48:21 visa Exp $ */
2
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 * $FreeBSD: src/sys/sys/eventvar.h,v 1.3 2000/05/26 02:06:54 jake Exp $
29 */
30
31#ifndef _SYS_EVENTVAR_H_
32#define _SYS_EVENTVAR_H_
33
34#include <sys/mutex.h>
35#include <sys/refcnt.h>
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
41/*
42 * Locking:
43 * I immutable after creation
44 * L kqueue_klist_lock
45 * a atomic operations
46 * q kq_lock
47 */
48struct kqueue {
49 struct mutex kq_lock; /* lock for queue access */
50 TAILQ_HEAD(, knote) kq_head; /* [q] list of pending event */
51 int kq_count; /* [q] # of pending events */
52 struct refcnt kq_refcnt; /* [a] # of references */
53 struct klist kq_klist; /* [L] knotes of other kqs */
54 struct filedesc *kq_fdp; /* [I] fd table of this kq */
55
56 LIST_ENTRY(kqueue) kq_next;
57
58 u_int kq_nknotes; /* [q] # of registered knotes */
59
60 int kq_knlistsize; /* [q] size of kq_knlist */
61 struct knlist *kq_knlist; /* [q] list of
62 * attached knotes */
63 u_long kq_knhashmask; /* [q] size of kq_knhash */
64 struct knlist *kq_knhash; /* [q] hash table for
65 * attached knotes */
66 struct task kq_task; /* deferring of activation */
67
68 int kq_state; /* [q] */
69#define KQ_SLEEP 0x02
70#define KQ_DYING 0x04
71#define KQ_TASK 0x08
72};
73
74#endif /* !_SYS_EVENTVAR_H_ */