diff options
Diffstat (limited to 'include/sys/unique.h')
-rw-r--r-- | include/sys/unique.h | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/include/sys/unique.h b/include/sys/unique.h new file mode 100644 index 000000000000..d4ba32e5c642 --- /dev/null +++ b/include/sys/unique.h @@ -0,0 +1,57 @@ +/* + * 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 + +#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 */ |