diff options
Diffstat (limited to 'usr/src/uts/common/fs/zfs/sys/rprwlock.h')
| -rw-r--r-- | usr/src/uts/common/fs/zfs/sys/rprwlock.h | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/usr/src/uts/common/fs/zfs/sys/rprwlock.h b/usr/src/uts/common/fs/zfs/sys/rprwlock.h new file mode 100644 index 0000000000..ba23799c9d --- /dev/null +++ b/usr/src/uts/common/fs/zfs/sys/rprwlock.h @@ -0,0 +1,61 @@ +/* + * CDDL HEADER START + * + * The contents of this file are subject to the terms of the + * Common Development and Distribution License (the "License"). + * You may not use this file except in compliance with the License. + * + * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE + * or http://www.opensolaris.org/os/licensing. + * See the License for the specific language governing permissions + * and limitations under the License. + * + * When distributing Covered Code, include this CDDL HEADER in each + * file and include the License file at usr/src/OPENSOLARIS.LICENSE. + * If applicable, add the following below this CDDL HEADER, with the + * fields enclosed by brackets "[]" replaced with your own identifying + * information: Portions Copyright [yyyy] [name of copyright owner] + * + * CDDL HEADER END + */ +/* + * Copyright 2007 Sun Microsystems, Inc. All rights reserved. + * Use is subject to license terms. + */ + +#ifndef _SYS_RPRWLOCK_H +#define _SYS_RPRWLOCK_H + +#pragma ident "%Z%%M% %I% %E% SMI" + +#include <sys/inttypes.h> +#include <sys/list.h> +#include <sys/zfs_context.h> +#include <sys/refcount.h> + +#ifdef __cplusplus +extern "C" { +#endif + +typedef struct rprwlock { + kmutex_t rw_lock; + kthread_t *rw_writer; + kcondvar_t rw_cv; + refcount_t rw_count; +} rprwlock_t; + +void rprw_init(rprwlock_t *rwl); +void rprw_destroy(rprwlock_t *rwl); +void rprw_enter_read(rprwlock_t *rwl, void *tag); +void rprw_enter_write(rprwlock_t *rwl, void *tag); +void rprw_enter(rprwlock_t *rwl, krw_t rw, void *tag); +void rprw_exit(rprwlock_t *rwl, void *tag); +boolean_t rprw_held(rprwlock_t *rwl, krw_t rw); +#define RPRW_READ_HELD(x) rprw_held(x, RW_READER) +#define RPRW_WRITE_HELD(x) rprw_held(x, RW_WRITER) + +#ifdef __cplusplus +} +#endif + +#endif /* _SYS_RPRWLOCK_H */ |