1/*	$OpenBSD: lock.h,v 1.27 2016/06/19 11:54:33 natano Exp $	*/
2
3/*
4 * Copyright (c) 1995
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * This code contains ideas from software contributed to Berkeley by
8 * Avadis Tevanian, Jr., Michael Wayne Young, and the Mach Operating
9 * System project at Carnegie-Mellon University.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 *    notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in the
18 *    documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its contributors
20 *    may be used to endorse or promote products derived from this software
21 *    without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 *
35 *	@(#)lock.h	8.12 (Berkeley) 5/19/95
36 */
37
38#ifndef	_LOCK_H_
39#define	_LOCK_H_
40
41#include <sys/rwlock.h>
42
43#define LK_EXCLUSIVE	RW_WRITE	/* exclusive lock */
44#define LK_SHARED	RW_READ		/* shared lock */
45#define LK_TYPE_MASK	(RW_WRITE|RW_READ) /* type of lock sought */
46#define LK_NOWAIT	RW_NOSLEEP	/* do not sleep to await lock */
47#define LK_RECURSEFAIL	RW_RECURSEFAIL	/* fail if recursive exclusive lock */
48#define LK_EXCLOTHER	RW_WRITE_OTHER	/* exclusive lock held by some other thread */
49#define LK_RWFLAGS	(RW_WRITE|RW_READ|RW_NOSLEEP|RW_RECURSEFAIL|RW_WRITE_OTHER)
50
51/* LK_ specific */
52#define LK_DRAIN	0x1000UL	/* wait for all lock activity to end */
53#define LK_RETRY	0x2000UL	/* vn_lock: retry until locked */
54
55#endif /* !_LOCK_H_ */
56