The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/eventvar.h

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    1 /*      $NetBSD: eventvar.h,v 1.4 2003/02/23 22:05:35 pk Exp $  */
    2 /*-
    3  * Copyright (c) 1999,2000 Jonathan Lemon <jlemon@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_ */

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