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 /*-
    2  * Copyright (c) 1999,2000 Jonathan Lemon <jlemon@FreeBSD.org>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  *      $FreeBSD: src/sys/sys/eventvar.h,v 1.1.2.2 2000/07/18 21:49:12 jlemon Exp $
   27  *      $DragonFly: src/sys/sys/eventvar.h,v 1.7 2007/01/15 01:26:56 dillon Exp $
   28  */
   29 
   30 #ifndef _SYS_EVENTVAR_H_
   31 #define _SYS_EVENTVAR_H_
   32 
   33 #if !defined(_KERNEL) && !defined(_KERNEL_STRUCTURES)
   34 
   35 #error "This file should not be included by userland programs."
   36 
   37 #else
   38 
   39 #ifndef _SYS_QUEUE_H_
   40 #include <sys/queue.h>
   41 #endif
   42 #ifndef _SYS_EVENT_H_
   43 #include <sys/event.h>
   44 #endif
   45 #ifndef _SYS_THREAD_H_
   46 #include <sys/thread.h>
   47 #endif
   48 #ifndef _SYS_FILEDESC_H_
   49 #include <sys/filedesc.h>
   50 #endif
   51 
   52 
   53 #define KQ_NEVENTS      8               /* minimize copy{in,out} calls */
   54 #define KQEXTENT        256             /* linear growth by this amount */
   55 
   56 TAILQ_HEAD(kqlist, knote);
   57 
   58 struct kqueue {
   59         struct kqlist   kq_knpend;
   60         struct kqlist   kq_knlist;
   61         int             kq_count;               /* number of pending events */
   62         struct          sigio *kq_sigio;
   63         struct          kqinfo kq_kqinfo;       
   64         struct          filedesc *kq_fdp;
   65         int             kq_state;
   66         u_long          kq_knhashmask;          /* size of knhash */
   67         struct          klist *kq_knhash;       /* hash table for knotes */
   68 };
   69 
   70 #define KQ_SLEEP        0x02
   71 #define KQ_ASYNC        0x04
   72 
   73 #endif  /* _KERNEL */
   74 #endif  /* !_SYS_EVENTVAR_H_ */

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