1fa9e4066Sahrens /* 2fa9e4066Sahrens * CDDL HEADER START 3fa9e4066Sahrens * 4fa9e4066Sahrens * The contents of this file are subject to the terms of the 591ebeef5Sahrens * Common Development and Distribution License (the "License"). 691ebeef5Sahrens * You may not use this file except in compliance with the License. 7fa9e4066Sahrens * 8fa9e4066Sahrens * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9fa9e4066Sahrens * or http://www.opensolaris.org/os/licensing. 10fa9e4066Sahrens * See the License for the specific language governing permissions 11fa9e4066Sahrens * and limitations under the License. 12fa9e4066Sahrens * 13fa9e4066Sahrens * When distributing Covered Code, include this CDDL HEADER in each 14fa9e4066Sahrens * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15fa9e4066Sahrens * If applicable, add the following below this CDDL HEADER, with the 16fa9e4066Sahrens * fields enclosed by brackets "[]" replaced with your own identifying 17fa9e4066Sahrens * information: Portions Copyright [yyyy] [name of copyright owner] 18fa9e4066Sahrens * 19fa9e4066Sahrens * CDDL HEADER END 20fa9e4066Sahrens */ 21fa9e4066Sahrens /* 2291ebeef5Sahrens * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 23fa9e4066Sahrens * Use is subject to license terms. 24fa9e4066Sahrens */ 25fa9e4066Sahrens 26fa9e4066Sahrens #ifndef _SYS_UNIQUE_H 27fa9e4066Sahrens #define _SYS_UNIQUE_H 28fa9e4066Sahrens 29fa9e4066Sahrens #include <sys/zfs_context.h> 30fa9e4066Sahrens 31fa9e4066Sahrens #ifdef __cplusplus 32fa9e4066Sahrens extern "C" { 33fa9e4066Sahrens #endif 34fa9e4066Sahrens 35fa9e4066Sahrens /* The number of significant bits in each unique value. */ 36fa9e4066Sahrens #define UNIQUE_BITS 56 37fa9e4066Sahrens 38fa9e4066Sahrens void unique_init(void); 3991ebeef5Sahrens void unique_fini(void); 40fa9e4066Sahrens 4191ebeef5Sahrens /* 4291ebeef5Sahrens * Return a new unique value (which will not be uniquified against until 43*f7170741SWill Andrews * it is unique_insert()-ed). 4491ebeef5Sahrens */ 45fa9e4066Sahrens uint64_t unique_create(void); 46fa9e4066Sahrens 47fa9e4066Sahrens /* Return a unique value, which equals the one passed in if possible. */ 48fa9e4066Sahrens uint64_t unique_insert(uint64_t value); 49fa9e4066Sahrens 50fa9e4066Sahrens /* Indicate that this value no longer needs to be uniquified against. */ 51fa9e4066Sahrens void unique_remove(uint64_t value); 52fa9e4066Sahrens 53fa9e4066Sahrens #ifdef __cplusplus 54fa9e4066Sahrens } 55fa9e4066Sahrens #endif 56fa9e4066Sahrens 57fa9e4066Sahrens #endif /* _SYS_UNIQUE_H */ 58