2008-11-20 23:01:55 +03:00
|
|
|
/*
|
|
|
|
|
* 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_UNIQUE_H
|
|
|
|
|
#define _SYS_UNIQUE_H
|
|
|
|
|
|
2008-12-03 23:09:06 +03:00
|
|
|
#pragma ident "%Z%%M% %I% %E% SMI"
|
2008-11-20 23:01:55 +03:00
|
|
|
|
|
|
|
|
#include <sys/zfs_context.h>
|
|
|
|
|
|
|
|
|
|
#ifdef __cplusplus
|
|
|
|
|
extern "C" {
|
|
|
|
|
#endif
|
|
|
|
|
|
|
|
|
|
/* The number of significant bits in each unique value. */
|
|
|
|
|
#define UNIQUE_BITS 56
|
|
|
|
|
|
|
|
|
|
void unique_init(void);
|
|
|
|
|
void unique_fini(void);
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* Return a new unique value (which will not be uniquified against until
|
|
|
|
|
* it is unique_insert()-ed.
|
|
|
|
|
*/
|
|
|
|
|
uint64_t unique_create(void);
|
|
|
|
|
|
|
|
|
|
/* Return a unique value, which equals the one passed in if possible. */
|
|
|
|
|
uint64_t unique_insert(uint64_t value);
|
|
|
|
|
|
|
|
|
|
/* Indicate that this value no longer needs to be uniquified against. */
|
|
|
|
|
void unique_remove(uint64_t value);
|
|
|
|
|
|
|
|
|
|
#ifdef __cplusplus
|
|
|
|
|
}
|
|
|
|
|
#endif
|
|
|
|
|
|
|
|
|
|
#endif /* _SYS_UNIQUE_H */
|
