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, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #ifndef _SYS_UNIQUE_H 28 #define _SYS_UNIQUE_H 29 30 #pragma ident "%Z%%M% %I% %E% SMI" 31 32 #include <sys/zfs_context.h> 33 34 #ifdef __cplusplus 35 extern "C" { 36 #endif 37 38 /* The number of significant bits in each unique value. */ 39 #define UNIQUE_BITS 56 40 41 void unique_init(void); 42 43 /* Return a new unique value. */ 44 uint64_t unique_create(void); 45 46 /* Return a unique value, which equals the one passed in if possible. */ 47 uint64_t unique_insert(uint64_t value); 48 49 /* Indicate that this value no longer needs to be uniquified against. */ 50 void unique_remove(uint64_t value); 51 52 #ifdef __cplusplus 53 } 54 #endif 55 56 #endif /* _SYS_UNIQUE_H */ 57