zfs/lib/libzcommon/include/sys/rprwlock.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 2007 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  */
  25
  26 #ifndef _SYS_RPRWLOCK_H
  27 #define _SYS_RPRWLOCK_H
  28
  29
  30
  31 #include <sys/inttypes.h>
  32 #include <sys/list.h>
  33 #include <sys/zfs_context.h>
  34 #include <sys/refcount.h>
  35
  36 #ifdef  __cplusplus
  37 extern "C" {
  38 #endif
  39
  40 typedef struct rprwlock {
  41         kmutex_t        rw_lock;
  42         kthread_t       *rw_writer;
  43         kcondvar_t      rw_cv;
  44         refcount_t      rw_count;
  45 } rprwlock_t;
  46
  47 void rprw_init(rprwlock_t *rwl);
  48 void rprw_destroy(rprwlock_t *rwl);
  49 void rprw_enter_read(rprwlock_t *rwl, void *tag);
  50 void rprw_enter_write(rprwlock_t *rwl, void *tag);
  51 void rprw_enter(rprwlock_t *rwl, krw_t rw, void *tag);
  52 void rprw_exit(rprwlock_t *rwl, void *tag);
  53 boolean_t rprw_held(rprwlock_t *rwl, krw_t rw);
  54 #define RPRW_READ_HELD(x)       rprw_held(x, RW_READER)
  55 #define RPRW_WRITE_HELD(x)      rprw_held(x, RW_WRITER)
  56
  57 #ifdef  __cplusplus
  58 }
  59 #endif
  60
  61 #endif /* _SYS_RPRWLOCK_H */