1 /* $OpenBSD: eventvar.h,v 1.17 2022/07/09 12:48:21 visa Exp $ */ 2 3 /*- 4 * Copyright (c) 1999,2000 Jonathan Lemon <jlemon@FreeBSD.org> 5 * 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 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $FreeBSD: src/sys/sys/eventvar.h,v 1.3 2000/05/26 02:06:54 jake Exp $ 29 */ 30 31 #ifndef _SYS_EVENTVAR_H_ 32 #define _SYS_EVENTVAR_H_ 33 34 #include <sys/mutex.h> 35 #include <sys/refcnt.h> 36 #include <sys/task.h> 37 38 #define KQ_NEVENTS 8 /* minimize copy{in,out} calls */ 39 #define KQEXTENT 256 /* linear growth by this amount */ 40 41 /* 42 * Locking: 43 * I immutable after creation 44 * L kqueue_klist_lock 45 * a atomic operations 46 * q kq_lock 47 */ 48 struct kqueue { 49 struct mutex kq_lock; /* lock for queue access */ 50 TAILQ_HEAD(, knote) kq_head; /* [q] list of pending event */ 51 int kq_count; /* [q] # of pending events */ 52 struct refcnt kq_refcnt; /* [a] # of references */ 53 struct klist kq_klist; /* [L] knotes of other kqs */ 54 struct filedesc *kq_fdp; /* [I] fd table of this kq */ 55 56 LIST_ENTRY(kqueue) kq_next; 57 58 u_int kq_nknotes; /* [q] # of registered knotes */ 59 60 int kq_knlistsize; /* [q] size of kq_knlist */ 61 struct knlist *kq_knlist; /* [q] list of 62 * attached knotes */ 63 u_long kq_knhashmask; /* [q] size of kq_knhash */ 64 struct knlist *kq_knhash; /* [q] hash table for 65 * attached knotes */ 66 struct task kq_task; /* deferring of activation */ 67 68 int kq_state; /* [q] */ 69 #define KQ_SLEEP 0x02 70 #define KQ_DYING 0x04 71 #define KQ_TASK 0x08 72 }; 73 74 #endif /* !_SYS_EVENTVAR_H_ */ 75