projects / mirror_zfs-debian.git / blame
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|---|---|---|
| 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 */ |