zfs/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  */
  24
  25 #ifndef _SYS_ZRLOCK_H
  26 #define _SYS_ZRLOCK_H
  27
  28 #include <sys/zfs_context.h>
  29
  30 #ifdef  __cplusplus
  31 extern "C" {
  32 #endif
  33
  34 typedef struct zrlock {
  35         kmutex_t zr_mtx;
  36         volatile int32_t zr_refcount;
  37         kcondvar_t zr_cv;
  38         uint16_t zr_pad;
  39 #ifdef  ZFS_DEBUG
  40         kthread_t *zr_owner;
  41         const char *zr_caller;
  42 #endif
  43 } zrlock_t;
  44
  45 extern void zrl_init(zrlock_t *);
  46 extern void zrl_destroy(zrlock_t *);
  47 #ifdef  ZFS_DEBUG
  48 #define zrl_add(_z)     zrl_add_debug((_z), __func__)
  49 extern void zrl_add_debug(zrlock_t *, const char *);
  50 #else
  51 extern void zrl_add(zrlock_t *);
  52 #endif
  53 extern void zrl_remove(zrlock_t *);
  54 extern int zrl_tryenter(zrlock_t *);
  55 extern void zrl_exit(zrlock_t *);
  56 extern int zrl_is_zero(zrlock_t *);
  57 extern int zrl_is_locked(zrlock_t *);
  58 #ifdef  ZFS_DEBUG
  59 extern kthread_t *zrl_owner(zrlock_t *);
  60 #endif
  61
  62 #ifdef  __cplusplus
  63 }
  64 #endif
  65
  66 #endif /* _SYS_ZRLOCK_H */