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 * 3. 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 38 struct selfd; 39 TAILQ_HEAD(selfdlist, selfd); 40 41 /* 42 * Used to maintain information about processes that wish to be 43 * notified when I/O becomes possible. 44 */ 45 struct 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 54 void seldrain(struct selinfo *sip); 55 void selrecord(struct thread *selector, struct selinfo *sip); 56 void selwakeup(struct selinfo *sip); 57 void selwakeuppri(struct selinfo *sip, int pri); 58 void seltdfini(struct thread *td); 59 #endif 60 61 #endif /* !_SYS_SELINFO_H_ */ 62