include/sys/zrlock.h

   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 */