FreeBSD/Linux Kernel Cross Reference
sys/sys/_rmlock.h
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: src/sys/sys/_rmlock.h,v 1.1 2007/11/08 14:47:55 ups Exp $
30 */
31
32 #ifndef _SYS__RMLOCK_H_
33 #define _SYS__RMLOCK_H_
34
35 /*
36 * XXXUPS remove as soon as we have per cpu variable
37 * linker sets and can define rm_queue in _rm_lock.h
38 */
39 #include <sys/pcpu.h>
40 /*
41 * Mostly reader/occasional writer lock.
42 */
43
44 LIST_HEAD(rmpriolist,rm_priotracker);
45
46 struct rmlock {
47 struct lock_object lock_object;
48 volatile int rm_noreadtoken;
49 LIST_HEAD(,rm_priotracker) rm_activeReaders;
50 struct mtx rm_lock;
51
52 };
53
54 struct rm_priotracker {
55 struct rm_queue rmp_cpuQueue; /* Must be first */
56 struct rmlock *rmp_rmlock;
57 struct thread *rmp_thread;
58 int rmp_flags;
59 LIST_ENTRY(rm_priotracker) rmp_qentry;
60 };
61
62 #endif /* !_SYS__RMLOCK_H_ */
63
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