]>
Commit | Line | Data |
---|---|---|
34dc7c2f BB |
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_UNIQUE_H | |
27 | #define _SYS_UNIQUE_H | |
28 | ||
29 | #pragma ident "@(#)unique.h 1.2 07/08/02 SMI" | |
30 | ||
31 | #include <sys/zfs_context.h> | |
32 | ||
33 | #ifdef __cplusplus | |
34 | extern "C" { | |
35 | #endif | |
36 | ||
37 | /* The number of significant bits in each unique value. */ | |
38 | #define UNIQUE_BITS 56 | |
39 | ||
40 | void unique_init(void); | |
41 | void unique_fini(void); | |
42 | ||
43 | /* | |
44 | * Return a new unique value (which will not be uniquified against until | |
45 | * it is unique_insert()-ed. | |
46 | */ | |
47 | uint64_t unique_create(void); | |
48 | ||
49 | /* Return a unique value, which equals the one passed in if possible. */ | |
50 | uint64_t unique_insert(uint64_t value); | |
51 | ||
52 | /* Indicate that this value no longer needs to be uniquified against. */ | |
53 | void unique_remove(uint64_t value); | |
54 | ||
55 | #ifdef __cplusplus | |
56 | } | |
57 | #endif | |
58 | ||
59 | #endif /* _SYS_UNIQUE_H */ |