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 32 #ifndef _SYS_SELINFO_H_ 33 #define _SYS_SELINFO_H_ 34 35 #include <sys/event.h> /* for struct klist */ 36 37 struct selfd; 38 TAILQ_HEAD(selfdlist, selfd); 39 40 /* 41 * Used to maintain information about processes that wish to be 42 * notified when I/O becomes possible. 43 */ 44 struct selinfo { 45 struct selfdlist si_tdlist; /* List of sleeping threads. */ 46 struct knlist si_note; /* kernel note list */ 47 struct mtx *si_mtx; /* Lock for tdlist. */ 48 }; 49 50 #define SEL_WAITING(si) (!TAILQ_EMPTY(&(si)->si_tdlist)) 51 52 #ifdef _KERNEL 53 void seldrain(struct selinfo *sip); 54 void selrecord(struct thread *selector, struct selinfo *sip); 55 void selwakeup(struct selinfo *sip); 56 void selwakeuppri(struct selinfo *sip, int pri); 57 void seltdfini(struct thread *td); 58 #endif 59 60 #endif /* !_SYS_SELINFO_H_ */ 61