1 /* $OpenBSD: mutex.h,v 1.3 2005/07/18 02:43:25 fgsch Exp $ */
2
3 /*
4 * Copyright (c) 2004 Artur Grabowski <art@openbsd.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 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. The name of the author may not be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
17 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
18 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
19 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
20 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27 #ifndef _I386_MUTEX_H_
28 #define _I386_MUTEX_H_
29
30 /*
31 * XXX - we don't really need the mtx_lock field, we can use mtx_oldipl
32 * as the lock to save some space.
33 */
34 struct mutex {
35 __volatile int mtx_lock;
36 int mtx_wantipl;
37 int mtx_oldipl;
38 void *mtx_owner;
39 };
40
41 #define MUTEX_INITIALIZER(IPL) { 0, (IPL), 0, NULL }
42
43 #define MUTEX_ASSERT_LOCKED(mtx) do { \
44 if ((mtx)->mtx_lock != 1 || \
45 (mtx)->mtx_owner != curcpu()) \
46 panic("mutex %p not held in %s", (mtx), __func__); \
47 } while (0)
48
49 #define MUTEX_ASSERT_UNLOCKED(mtx) do { \
50 if ((mtx)->mtx_lock == 1 && \
51 (mtx)->mtx_owner == curcpu()) \
52 panic("mutex %p held in %s", (mtx), __func__); \
53 } while (0)
54
55 #define MUTEX_OLDIPL(mtx) (mtx)->mtx_oldipl
56
57 #endif