bsd/sys/eventvar.h

   1 /*
   2  * Copyright (c) 2003 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_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. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*-
  29  * Copyright (c) 1999,2000 Jonathan Lemon <jlemon@FreeBSD.org>
  30  * All rights reserved.
  31  *
  32  * Redistribution and use in source and binary forms, with or without
  33  * modification, are permitted provided that the following conditions
  34  * are met:
  35  * 1. Redistributions of source code must retain the above copyright
  36  *    notice, this list of conditions and the following disclaimer.
  37  * 2. Redistributions in binary form must reproduce the above copyright
  38  *    notice, this list of conditions and the following disclaimer in the
  39  *    documentation and/or other materials provided with the distribution.
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  *      $FreeBSD: src/sys/sys/eventvar.h,v 1.1.2.2 2000/07/18 21:49:12 jlemon Exp $
  54  */
  55
  56 #ifndef _SYS_EVENTVAR_H_
  57 #define _SYS_EVENTVAR_H_
  58
  59 #include <sys/event.h>
  60 #include <sys/select.h>
  61 #include <kern/kern_types.h>
  62
  63 #define KQ_NEVENTS      16              /* minimize copy{in,out} calls */
  64 #define KQEXTENT        256             /* linear growth by this amount */
  65
  66 struct kqueue {
  67         decl_lck_spin_data( ,kq_lock)           /* kqueue lock */
  68         int             kq_state;
  69         int             kq_count;               /* number of queued events */
  70         struct kqtailq  kq_head;                /* list of queued events */
  71         struct kqtailq  kq_inprocess;           /* list of in-process events */
  72         struct selinfo  kq_sel;         /* parent select/kqueue info */
  73         struct proc     *kq_p;          /* process containing kqueue */
  74         int             kq_level;       /* nesting level */
  75
  76 #define KQ_SEL          0x01
  77 #define KQ_SLEEP        0x02
  78 #define KQ_PROCWAIT     0x04
  79 };
  80
  81 extern struct kqueue *kqueue_alloc(struct proc *);
  82 extern void kqueue_dealloc(struct kqueue *);
  83
  84 typedef int (*kevent_callback_t)(struct kqueue *, struct kevent *, void *);
  85 typedef void (*kevent_continue_t)(struct kqueue *, void *, int);
  86
  87 extern int kevent_register(struct kqueue *, struct kevent *, struct proc *);
  88 extern int kevent_scan(struct kqueue *, kevent_callback_t, kevent_continue_t,
  89                        void *, struct timeval *, struct proc *);
  90
  91 #endif /* !_SYS_EVENTVAR_H_ */