source: rtems-libbsd/freebsd/sys/sys/eventvar.h @ 0c9f27b

/*-
 * Copyright (c) 1999,2000 Jonathan Lemon <jlemon@FreeBSD.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *      $FreeBSD$
 */

#ifndef _SYS_EVENTVAR_H_
#define _SYS_EVENTVAR_H_

#ifndef _KERNEL
#error "no user-servicable parts inside"
#endif

#include <sys/_task.h>

#define KQ_NEVENTS      8               /* minimize copy{in,out} calls */
#define KQEXTENT        256             /* linear growth by this amount */

struct kqueue {
        struct          mtx kq_lock;
        int             kq_refcnt;
        SLIST_ENTRY(kqueue)     kq_list;
        TAILQ_HEAD(, knote)     kq_head;        /* list of pending event */
        int             kq_count;               /* number of pending events */
        struct          selinfo kq_sel;
        struct          sigio *kq_sigio;
#ifndef __rtems__
        struct          filedesc *kq_fdp;
#endif /* __rtems__ */
        int             kq_state;
#define KQ_SEL          0x01
#define KQ_SLEEP        0x02
#define KQ_FLUXWAIT     0x04                    /* waiting for a in flux kn */
#define KQ_ASYNC        0x08
#define KQ_CLOSING      0x10
#define KQ_TASKSCHED    0x20                    /* task scheduled */
#define KQ_TASKDRAIN    0x40                    /* waiting for task to drain */
        int             kq_knlistsize;          /* size of knlist */
        struct          klist *kq_knlist;       /* list of knotes */
        u_long          kq_knhashmask;          /* size of knhash */
        struct          klist *kq_knhash;       /* hash table for knotes */
        struct          task kq_task;
};

#endif /* !_SYS_EVENTVAR_H_ */