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