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      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