1/*-
2 * Copyright (c) 1992, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 *	@(#)select.h	8.2 (Berkeley) 1/4/94
30 * $FreeBSD$
31 */
32
33#ifndef _SYS_SELINFO_H_
34#define	_SYS_SELINFO_H_
35
36#include <sys/event.h>		/* for struct klist */
37
38struct selfd;
39TAILQ_HEAD(selfdlist, selfd);
40
41/*
42 * Used to maintain information about processes that wish to be
43 * notified when I/O becomes possible.
44 */
45struct selinfo {
46	struct selfdlist	si_tdlist;	/* List of sleeping threads. */
47	struct knlist		si_note;	/* kernel note list */
48	struct mtx		*si_mtx;	/* Lock for tdlist. */
49};
50
51#define	SEL_WAITING(si)		(!TAILQ_EMPTY(&(si)->si_tdlist))
52
53#ifdef _KERNEL
54void	seldrain(struct selinfo *sip);
55void	selrecord(struct thread *selector, struct selinfo *sip);
56void	selwakeup(struct selinfo *sip);
57void	selwakeuppri(struct selinfo *sip, int pri);
58void	seltdfini(struct thread *td);
59#endif
60
61#endif /* !_SYS_SELINFO_H_ */
62