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 https://opensource.org/licenses/CDDL-1.0.
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	kcondvar_t zr_cv;
38	volatile int32_t zr_refcount;
39#ifdef	ZFS_DEBUG
40	kthread_t *zr_owner;
41	const char *zr_caller;
42#endif
43} zrlock_t;
44
45extern void zrl_init(zrlock_t *);
46extern void zrl_destroy(zrlock_t *);
47#define	zrl_add(_z)	zrl_add_impl((_z), __func__)
48extern void zrl_add_impl(zrlock_t *, const char *);
49extern void zrl_remove(zrlock_t *);
50extern int zrl_tryenter(zrlock_t *);
51extern void zrl_exit(zrlock_t *);
52extern int zrl_is_zero(zrlock_t *);
53extern int zrl_is_locked(zrlock_t *);
54#ifdef	ZFS_DEBUG
55extern kthread_t *zrl_owner(zrlock_t *);
56#endif
57
58#ifdef	__cplusplus
59}
60#endif
61
62#endif /* _SYS_ZRLOCK_H */
63