xref: /netbsd/sys/sys/eventvar.h (revision 58a2c399)
1 /*	$NetBSD: eventvar.h,v 1.10 2021/10/10 18:07:51 thorpej 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 1.4 2000/07/18 19:31:48 jlemon Exp
29  */
30 
31 /*
32  * This header is provided for the kqueue implementation and kmem
33  * grovellers, and is not expected to be used elsewhere.
34  */
35 
36 #ifndef _SYS_EVENTVAR_H_
37 #define	_SYS_EVENTVAR_H_
38 
39 #include <sys/mutex.h>
40 #include <sys/selinfo.h>
41 #include <sys/filedesc.h>
42 
43 #define	KQ_NEVENTS	8		/* minimize copy{in,out} calls */
44 #define	KQ_EXTENT	256		/* linear growth by this amount */
45 #define	KFILTER_MAXNAME	256		/* maximum size of a filter name */
46 #define	KFILTER_EXTENT	8		/* grow user_kfilters by this amt */
47 
48 struct kqueue {
49 	TAILQ_HEAD(kqlist, knote) kq_head;	/* list of pending event */
50 	kmutex_t	kq_lock;		/* mutex for queue access */
51 	filedesc_t	*kq_fdp;
52 	struct selinfo	kq_sel;
53 	kcondvar_t	kq_cv;
54 	uint32_t	kq_count;		/* number of pending events */
55 };
56 
57 #define	KQ_RESTART	__BIT(31)		/* force ERESTART */
58 #define	KQ_CLOSING	__BIT(30)		/* kqueue is closing for good */
59 #define	KQ_MAXCOUNT	__BITS(0,29)
60 #define	KQ_COUNT(kq)	((unsigned int)((kq)->kq_count & KQ_MAXCOUNT))
61 
62 #ifdef _KERNEL
63 
64 #if defined(DDB)
65 void	kqueue_printit(struct kqueue *, bool,
66 	    void (*)(const char *, ...));
67 #endif /* DDB */
68 
69 #endif /* _KERNEL */
70 
71 #endif /* !_SYS_EVENTVAR_H_ */
72