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

     /*      $NetBSD: eventvar.h,v 1.8 2008/03/21 21:53:35 ad Exp $  */
     
     /*-
      * Copyright (c) 1999,2000 Jonathan Lemon <jlemon@FreeBSD.org>
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * FreeBSD: src/sys/sys/eventvar.h,v 1.4 2000/07/18 19:31:48 jlemon Exp
     */
    
    /*
     * This header is provided for the kqueue implementation and kmem
     * grovellers, and is not expected to be used elsewhere.
     */
    
    #ifndef _SYS_EVENTVAR_H_
    #define _SYS_EVENTVAR_H_
    
    #include <sys/mutex.h>
    #include <sys/selinfo.h>
    #include <sys/filedesc.h>
    
    #define KQ_NEVENTS      8               /* minimize copy{in,out} calls */
    #define KQ_EXTENT       256             /* linear growth by this amount */
    #define KFILTER_MAXNAME 256             /* maximum size of a filter name */
    #define KFILTER_EXTENT  8               /* grow user_kfilters by this amt */
    
    struct kqueue {
            TAILQ_HEAD(kqlist, knote) kq_head;      /* list of pending event */
            kmutex_t        kq_lock;                /* mutex for queue access */
            filedesc_t      *kq_fdp;
            struct selinfo  kq_sel;
            kcondvar_t      kq_cv;
            int             kq_count;               /* number of pending events */
    };
    
    #endif /* !_SYS_EVENTVAR_H_ */

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