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 1.8 2008/03/21 21:53:35 ad 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         int             kq_count;               /* number of pending events */
   55 };
   56 
   57 #endif /* !_SYS_EVENTVAR_H_ */

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