bsd/sys/eventvar.h

   1 /*
   2  * Copyright (c) 2003 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_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. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23 /*-
  24  * Copyright (c) 1999,2000 Jonathan Lemon <jlemon@FreeBSD.org>
  25  * All rights reserved.
  26  *
  27  * Redistribution and use in source and binary forms, with or without
  28  * modification, are permitted provided that the following conditions
  29  * are met:
  30  * 1. Redistributions of source code must retain the above copyright
  31  *    notice, this list of conditions and the following disclaimer.
  32  * 2. Redistributions in binary form must reproduce the above copyright
  33  *    notice, this list of conditions and the following disclaimer in the
  34  *    documentation and/or other materials provided with the distribution.
  35  *
  36  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  37  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  38  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  39  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  40  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  41  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  42  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  43  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  44  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  45  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  46  * SUCH DAMAGE.
  47  *
  48  *      $FreeBSD: src/sys/sys/eventvar.h,v 1.1.2.2 2000/07/18 21:49:12 jlemon Exp $
  49  */
  50
  51 #ifndef _SYS_EVENTVAR_H_
  52 #define _SYS_EVENTVAR_H_
  53
  54 #include <sys/event.h>
  55 #include <sys/select.h>
  56 #include <kern/kern_types.h>
  57
  58 #define KQ_NEVENTS      16              /* minimize copy{in,out} calls */
  59 #define KQEXTENT        256             /* linear growth by this amount */
  60
  61 struct kqueue {
  62         decl_lck_spin_data( ,kq_lock)           /* kqueue lock */
  63         int             kq_state;
  64         int             kq_count;               /* number of queued events */
  65         struct kqtailq  kq_head;                /* list of queued events */
  66         struct kqtailq  kq_inprocess;           /* list of in-process events */
  67         struct selinfo  kq_sel;         /* parent select/kqueue info */
  68         struct filedesc *kq_fdp;
  69
  70 #define KQ_SEL          0x01
  71 #define KQ_SLEEP        0x02
  72 #define KQ_PROCWAIT     0x04
  73 };
  74
  75 extern struct kqueue *kqueue_alloc(struct proc *);
  76 extern void kqueue_dealloc(struct kqueue *, struct proc *);
  77
  78 typedef int (*kevent_callback_t)(struct kqueue *, struct kevent *, void *);
  79 typedef void (*kevent_continue_t)(struct kqueue *, void *, int);
  80
  81 extern int kevent_register(struct kqueue *, struct kevent *, struct proc *);
  82 extern int kevent_scan(struct kqueue *, kevent_callback_t, kevent_continue_t,
  83                        void *, struct timeval *, struct proc *);
  84
  85 #endif /* !_SYS_EVENTVAR_H_ */