1/*- 2 * Copyright (c) 2007 Stephan Uphoff <ups@FreeBSD.org> 3 * 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 author nor the names of any co-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 AUTHOR 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 AUTHOR 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 * $FreeBSD$ 30 */ 31 32#ifndef _SYS__RMLOCK_H_ 33#define _SYS__RMLOCK_H_ 34 35/* 36 * Mostly reader/occasional writer lock. 37 */ 38 39LIST_HEAD(rmpriolist,rm_priotracker); 40 41struct rm_queue { 42 struct rm_queue *volatile rmq_next; 43 struct rm_queue *volatile rmq_prev; 44}; 45 46struct rmlock { 47 struct lock_object lock_object; 48 volatile cpuset_t rm_writecpus; 49 LIST_HEAD(,rm_priotracker) rm_activeReaders; 50 union { 51 struct lock_object _rm_wlock_object; 52 struct mtx _rm_lock_mtx; 53 struct sx _rm_lock_sx; 54 } _rm_lock; 55}; 56 57#define rm_wlock_object _rm_lock._rm_wlock_object 58#define rm_lock_mtx _rm_lock._rm_lock_mtx 59#define rm_lock_sx _rm_lock._rm_lock_sx 60 61struct rm_priotracker { 62 struct rm_queue rmp_cpuQueue; /* Must be first */ 63 struct rmlock *rmp_rmlock; 64 struct thread *rmp_thread; 65 int rmp_flags; 66 LIST_ENTRY(rm_priotracker) rmp_qentry; 67}; 68 69#endif /* !_SYS__RMLOCK_H_ */ 70