2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 2007 Stephan Uphoff <ups@FreeBSD.org>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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 author nor the names of any co-contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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
34 #ifndef _SYS__RMLOCK_H_
35 #define _SYS__RMLOCK_H_
38 * Mostly reader/occasional writer lock.
41 LIST_HEAD(rmpriolist,rm_priotracker);
44 struct rm_queue *volatile rmq_next;
45 struct rm_queue *volatile rmq_prev;
49 struct lock_object lock_object;
50 volatile cpuset_t rm_writecpus;
51 LIST_HEAD(,rm_priotracker) rm_activeReaders;
53 struct lock_object _rm_wlock_object;
54 struct mtx _rm_lock_mtx;
55 struct sx _rm_lock_sx;
59 #define rm_wlock_object _rm_lock._rm_wlock_object
60 #define rm_lock_mtx _rm_lock._rm_lock_mtx
61 #define rm_lock_sx _rm_lock._rm_lock_sx
63 struct rm_priotracker {
64 struct rm_queue rmp_cpuQueue; /* Must be first */
65 struct rmlock *rmp_rmlock;
66 struct thread *rmp_thread;
68 LIST_ENTRY(rm_priotracker) rmp_qentry;
71 #endif /* !_SYS__RMLOCK_H_ */