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  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    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: head/sys/sys/eventvar.h 326256 2017-11-27 15:01:59Z pfg $
   29  */
   30 
   31 #ifndef _SYS_EVENTVAR_H_
   32 #define _SYS_EVENTVAR_H_
   33 
   34 #ifndef _KERNEL
   35 #error "no user-serviceable parts inside"
   36 #endif
   37 
   38 #include <sys/_task.h>
   39 
   40 #define KQ_NEVENTS      8               /* minimize copy{in,out} calls */
   41 #define KQEXTENT        256             /* linear growth by this amount */
   42 
   43 struct kqueue {
   44         struct          mtx kq_lock;
   45         int             kq_refcnt;
   46         TAILQ_ENTRY(kqueue)     kq_list;
   47         TAILQ_HEAD(, knote)     kq_head;        /* list of pending event */
   48         int             kq_count;               /* number of pending events */
   49         struct          selinfo kq_sel;
   50         struct          sigio *kq_sigio;
   51         struct          filedesc *kq_fdp;
   52         int             kq_state;
   53 #define KQ_SEL          0x01
   54 #define KQ_SLEEP        0x02
   55 #define KQ_FLUXWAIT     0x04                    /* waiting for a in flux kn */
   56 #define KQ_ASYNC        0x08
   57 #define KQ_CLOSING      0x10
   58 #define KQ_TASKSCHED    0x20                    /* task scheduled */
   59 #define KQ_TASKDRAIN    0x40                    /* waiting for task to drain */
   60         int             kq_knlistsize;          /* size of knlist */
   61         struct          klist *kq_knlist;       /* list of knotes */
   62         u_long          kq_knhashmask;          /* size of knhash */
   63         struct          klist *kq_knhash;       /* hash table for knotes */
   64         struct          task kq_task;
   65         struct          ucred *kq_cred;
   66 };
   67 
   68 #endif /* !_SYS_EVENTVAR_H_ */

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