1/*
2 * Copyright (c) 2003 Apple Computer, Inc. All rights reserved.
3 *
4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. The rights granted to you under the License
10 * may not be used to create, or enable the creation or redistribution of,
11 * unlawful or unlicensed copies of an Apple operating system, or to
12 * circumvent, violate, or enable the circumvention or violation of, any
13 * terms of an Apple operating system software license agreement.
14 *
15 * Please obtain a copy of the License at
16 * http://www.opensource.apple.com/apsl/ and read it before using this file.
17 *
18 * The Original Code and all software distributed under the License are
19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
23 * Please see the License for the specific language governing rights and
24 * limitations under the License.
25 *
26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
27 */
28/*-
29 * Copyright (c) 1999,2000 Jonathan Lemon <jlemon@FreeBSD.org>
30 * All rights reserved.
31 *
32 * Redistribution and use in source and binary forms, with or without
33 * modification, are permitted provided that the following conditions
34 * are met:
35 * 1. Redistributions of source code must retain the above copyright
36 *    notice, this list of conditions and the following disclaimer.
37 * 2. Redistributions in binary form must reproduce the above copyright
38 *    notice, this list of conditions and the following disclaimer in the
39 *    documentation and/or other materials provided with the distribution.
40 *
41 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 *	$FreeBSD: src/sys/sys/eventvar.h,v 1.1.2.2 2000/07/18 21:49:12 jlemon Exp $
54 */
55
56#ifndef _SYS_EVENTVAR_H_
57#define _SYS_EVENTVAR_H_
58
59#include <sys/event.h>
60#include <sys/select.h>
61#include <kern/kern_types.h>
62
63#define KQ_NEVENTS	16		/* minimize copy{in,out} calls */
64#define KQEXTENT	256		/* linear growth by this amount */
65
66struct kqueue {
67	wait_queue_set_t kq_wqs;	/* private wait queue set */
68	decl_lck_spin_data( ,kq_lock)	/* kqueue lock */
69	int		kq_state;
70	int		kq_count;	/* number of queued events */
71	uint32_t        kq_nprocess;	/* atomic counter for kqueue_process */
72	struct kqtailq	kq_head;	/* list of queued events */
73	struct selinfo	kq_sel;		/* parent select/kqueue info */
74	struct proc	*kq_p;		/* process containing kqueue */
75	int		kq_level;	/* nesting level */
76
77#define KQ_SEL		0x01
78#define KQ_SLEEP	0x02
79#define KQ_PROCWAIT	0x04
80#define KQ_KEV32	0x08
81#define KQ_KEV64	0x10
82};
83
84extern struct kqueue *kqueue_alloc(struct proc *);
85extern void kqueue_dealloc(struct kqueue *);
86
87typedef int (*kevent_callback_t)(struct kqueue *, struct kevent64_s *, void *);
88typedef void (*kqueue_continue_t)(struct kqueue *, void *, int);
89
90extern int kevent_register(struct kqueue *, struct kevent64_s *, struct proc *);
91extern int kqueue_scan(struct kqueue *, kevent_callback_t, kqueue_continue_t,
92		       void *, struct timeval *, struct proc *);
93
94#endif /* !_SYS_EVENTVAR_H_ */
95