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eventvar.h revision 1.5 
      1 /*	$NetBSD: eventvar.h,v 1.5 2005/02/26 22:25:34 perry Exp $	*/
      2 /*-
      3  * Copyright (c) 1999,2000 Jonathan Lemon <jlemon (at) FreeBSD.org>
      4  * All rights reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  *
     15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     25  * SUCH DAMAGE.
     26  *
     27  *	$FreeBSD: src/sys/sys/eventvar.h,v 1.4 2000/07/18 19:31:48 jlemon Exp $
     28  */
     29 
     30 #ifndef _SYS_EVENTVAR_H_
     31 #define	_SYS_EVENTVAR_H_
     32 
     33 #define	KQ_NEVENTS	8		/* minimize copy{in,out} calls */
     34 #define	KQ_EXTENT	256		/* linear growth by this amount */
     35 #define	KFILTER_MAXNAME	256		/* maximum size of a filter name */
     36 #define	KFILTER_EXTENT	8		/* grow user_kfilters by this amt */
     37 
     38 struct kqueue {
     39 	TAILQ_HEAD(kqlist, knote) kq_head;	/* list of pending event */
     40 	int		kq_count;		/* number of pending events */
     41 	struct simplelock kq_lock;		/* mutex for queue access */
     42 	struct selinfo	kq_sel;
     43 	struct filedesc *kq_fdp;
     44 	int		kq_state;
     45 #define	KQ_SLEEP	0x01
     46 	struct kevent	kq_kev[KQ_NEVENTS];
     47 };
     48 
     49 #endif /* !_SYS_EVENTVAR_H_ */
     50