FreeBSD/Linux Kernel Cross Reference
sys/sys/selinfo.h
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: releng/5.3/sys/sys/selinfo.h 136588 2004-10-16 08:43:07Z cvs2svn $
31 */
32
33 #ifndef _SYS_SELINFO_H_
34 #define _SYS_SELINFO_H_
35
36 #include <sys/event.h> /* for struct klist */
37
38 /*
39 * Used to maintain information about processes that wish to be
40 * notified when I/O becomes possible.
41 */
42 struct selinfo {
43 TAILQ_ENTRY(selinfo) si_thrlist; /* list hung off of thread */
44 struct thread *si_thread; /* thread waiting */
45 struct knlist si_note; /* kernel note list */
46 short si_flags; /* see below */
47 };
48 #define SI_COLL 0x0001 /* collision occurred */
49
50 #define SEL_WAITING(si) \
51 ((si)->si_thread != NULL || ((si)->si_flags & SI_COLL) != 0)
52
53 #ifdef _KERNEL
54 void clear_selinfo_list(struct thread *td);
55 void selrecord(struct thread *selector, struct selinfo *sip);
56 void selwakeup(struct selinfo *sip);
57 void selwakeuppri(struct selinfo *sip, int pri);
58 #endif
59
60 #endif /* !_SYS_SELINFO_H_ */
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