xref: /illumos-gate/usr/src/uts/common/fs/zfs/sys/zrlock.h (revision 9a686fbc186e8e2a64e9a5094d44c7d6fa0ea167)
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
32 extern "C" {
33 #endif
34 
35 typedef 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 
46 extern void zrl_init(zrlock_t *);
47 extern void zrl_destroy(zrlock_t *);
48 #define	zrl_add(_z)	zrl_add_impl((_z), __func__)
49 extern void zrl_add_impl(zrlock_t *, const char *);
50 extern void zrl_remove(zrlock_t *);
51 extern int zrl_tryenter(zrlock_t *);
52 extern void zrl_exit(zrlock_t *);
53 extern int zrl_is_zero(zrlock_t *);
54 extern int zrl_is_locked(zrlock_t *);
55 #ifdef	ZFS_DEBUG
56 extern kthread_t *zrl_owner(zrlock_t *);
57 #endif
58 
59 #ifdef	__cplusplus
60 }
61 #endif
62 
63 #endif /* _SYS_ZRLOCK_H */
64