zrlock.h revision 290765 
1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21/*
22 * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
23 * Copyright (c) 2015 by Delphix. All rights reserved.
24 */
25
26#ifndef	_SYS_ZRLOCK_H
27#define	_SYS_ZRLOCK_H
28
29#include <sys/zfs_context.h>
30
31#ifdef	__cplusplus
32extern "C" {
33#endif
34
35typedef struct zrlock {
36	kmutex_t zr_mtx;
37	volatile int32_t zr_refcount;
38	kcondvar_t zr_cv;
39	uint16_t zr_pad;
40#ifdef	ZFS_DEBUG
41	kthread_t *zr_owner;
42	const char *zr_caller;
43#endif
44} zrlock_t;
45
46extern void zrl_init(zrlock_t *);
47extern void zrl_destroy(zrlock_t *);
48#define	zrl_add(_z)	zrl_add_impl((_z), __func__)
49extern void zrl_add_impl(zrlock_t *, const char *);
50extern void zrl_remove(zrlock_t *);
51extern int zrl_tryenter(zrlock_t *);
52extern void zrl_exit(zrlock_t *);
53extern int zrl_is_zero(zrlock_t *);
54extern int zrl_is_locked(zrlock_t *);
55#ifdef	ZFS_DEBUG
56extern kthread_t *zrl_owner(zrlock_t *);
57#endif
58
59#ifdef	__cplusplus
60}
61#endif
62
63#endif /* _SYS_ZRLOCK_H */
64