1168404Spjd/* 2168404Spjd * CDDL HEADER START 3168404Spjd * 4168404Spjd * The contents of this file are subject to the terms of the 5185029Spjd * Common Development and Distribution License (the "License"). 6185029Spjd * You may not use this file except in compliance with the License. 7168404Spjd * 8168404Spjd * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9168404Spjd * or http://www.opensolaris.org/os/licensing. 10168404Spjd * See the License for the specific language governing permissions 11168404Spjd * and limitations under the License. 12168404Spjd * 13168404Spjd * When distributing Covered Code, include this CDDL HEADER in each 14168404Spjd * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15168404Spjd * If applicable, add the following below this CDDL HEADER, with the 16168404Spjd * fields enclosed by brackets "[]" replaced with your own identifying 17168404Spjd * information: Portions Copyright [yyyy] [name of copyright owner] 18168404Spjd * 19168404Spjd * CDDL HEADER END 20168404Spjd */ 21168404Spjd/* 22185029Spjd * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 23168404Spjd * Use is subject to license terms. 24168404Spjd */ 25168404Spjd 26168404Spjd#ifndef _SYS_UNIQUE_H 27168404Spjd#define _SYS_UNIQUE_H 28168404Spjd 29168404Spjd#include <sys/zfs_context.h> 30168404Spjd 31168404Spjd#ifdef __cplusplus 32168404Spjdextern "C" { 33168404Spjd#endif 34168404Spjd 35168404Spjd/* The number of significant bits in each unique value. */ 36168404Spjd#define UNIQUE_BITS 56 37168404Spjd 38168404Spjdvoid unique_init(void); 39185029Spjdvoid unique_fini(void); 40168404Spjd 41185029Spjd/* 42185029Spjd * Return a new unique value (which will not be uniquified against until 43251631Sdelphij * it is unique_insert()-ed). 44185029Spjd */ 45168404Spjduint64_t unique_create(void); 46168404Spjd 47168404Spjd/* Return a unique value, which equals the one passed in if possible. */ 48168404Spjduint64_t unique_insert(uint64_t value); 49168404Spjd 50168404Spjd/* Indicate that this value no longer needs to be uniquified against. */ 51168404Spjdvoid unique_remove(uint64_t value); 52168404Spjd 53168404Spjd#ifdef __cplusplus 54168404Spjd} 55168404Spjd#endif 56168404Spjd 57168404Spjd#endif /* _SYS_UNIQUE_H */ 58