_mutex.h revision 98059 
1/*-
2 * Copyright (c) 1997 Berkeley Software Design, Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 * 3. Berkeley Software Design Inc's name may not be used to endorse or
13 *    promote products derived from this software without specific prior
14 *    written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY BERKELEY SOFTWARE DESIGN INC ``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 BERKELEY SOFTWARE DESIGN INC 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: head/sys/sys/_mutex.h 98059 2002-06-09 02:52:40Z bde $
29 */
30
31#ifndef _SYS__MUTEX_H_
32#define	_SYS__MUTEX_H_
33
34/*
35 * Sleep/spin mutex.
36 */
37struct mtx {
38	struct lock_object	mtx_object;	/* Common lock properties. */
39	volatile uintptr_t	mtx_lock;	/* Owner and flags. */
40	volatile u_int		mtx_recurse;	/* Number of recursive holds. */
41	TAILQ_HEAD(, thread)	mtx_blocked;	/* Threads blocked on us. */
42	LIST_ENTRY(mtx)		mtx_contested;	/* Next contested mtx. */
43
44	/* Fields used only if MUTEX_PROFILING is configured: */
45	u_int64_t		acqtime;
46	const char		*file;
47	int			line;
48};
49
50#endif /* !_SYS__MUTEX_H_ */
51