bsd/sys/eventvar.h

   1 /*
   2  * Copyright (c) 2006 Apple Computer, Inc. All Rights Reserved.
   3  *
   4  * @APPLE_LICENSE_OSREFERENCE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License.  The rights granted to you under the
  10  * License may not be used to create, or enable the creation or
  11  * redistribution of, unlawful or unlicensed copies of an Apple operating
  12  * system, or to circumvent, violate, or enable the circumvention or
  13  * violation of, any terms of an Apple operating system software license
  14  * agreement.
  15  *
  16  * Please obtain a copy of the License at
  17  * http://www.opensource.apple.com/apsl/ and read it before using this
  18  * file.
  19  *
  20  * The Original Code and all software distributed under the License are
  21  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  22  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  23  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  25  * Please see the License for the specific language governing rights and
  26  * limitations under the License.
  27  *
  28  * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
  29  */
  30 /*-
  31  * Copyright (c) 1999,2000 Jonathan Lemon <jlemon@FreeBSD.org>
  32  * All rights reserved.
  33  *
  34  * Redistribution and use in source and binary forms, with or without
  35  * modification, are permitted provided that the following conditions
  36  * are met:
  37  * 1. Redistributions of source code must retain the above copyright
  38  *    notice, this list of conditions and the following disclaimer.
  39  * 2. Redistributions in binary form must reproduce the above copyright
  40  *    notice, this list of conditions and the following disclaimer in the
  41  *    documentation and/or other materials provided with the distribution.
  42  *
  43  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  44  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  45  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  46  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  47  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  48  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  49  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  50  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  51  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  52  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  53  * SUCH DAMAGE.
  54  *
  55  *      $FreeBSD: src/sys/sys/eventvar.h,v 1.1.2.2 2000/07/18 21:49:12 jlemon Exp $
  56  */
  57
  58 #ifndef _SYS_EVENTVAR_H_
  59 #define _SYS_EVENTVAR_H_
  60
  61 #include <sys/event.h>
  62 #include <sys/select.h>
  63 #include <kern/kern_types.h>
  64
  65 #define KQ_NEVENTS      16              /* minimize copy{in,out} calls */
  66 #define KQEXTENT        256             /* linear growth by this amount */
  67
  68 struct kqueue {
  69         decl_lck_spin_data( ,kq_lock)           /* kqueue lock */
  70         int             kq_state;
  71         int             kq_count;               /* number of queued events */
  72         struct kqtailq  kq_head;                /* list of queued events */
  73         struct kqtailq  kq_inprocess;           /* list of in-process events */
  74         struct selinfo  kq_sel;         /* parent select/kqueue info */
  75         struct filedesc *kq_fdp;
  76
  77 #define KQ_SEL          0x01
  78 #define KQ_SLEEP        0x02
  79 #define KQ_PROCWAIT     0x04
  80 };
  81
  82 extern struct kqueue *kqueue_alloc(struct proc *);
  83 extern void kqueue_dealloc(struct kqueue *, struct proc *);
  84
  85 typedef int (*kevent_callback_t)(struct kqueue *, struct kevent *, void *);
  86 typedef void (*kevent_continue_t)(struct kqueue *, void *, int);
  87
  88 extern int kevent_register(struct kqueue *, struct kevent *, struct proc *);
  89 extern int kevent_scan(struct kqueue *, kevent_callback_t, kevent_continue_t,
  90                        void *, struct timeval *, struct proc *);
  91
  92 #endif /* !_SYS_EVENTVAR_H_ */