1 /* 2 * Copyright (c) 2005-2012 The DragonFly Project. All rights reserved. 3 * 4 * This code is derived from software contributed to The DragonFly Project 5 * by Jeffrey Hsu. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the 16 * distribution. 17 * 3. Neither the name of The DragonFly Project nor the names of its 18 * contributors may be used to endorse or promote products derived 19 * from this software without specific, prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 */ 35 36 /** 37 * IDR is a small Integer ID management library that provides an interface to 38 * map integers with some pointer that can later be retrieved. 39 * 40 * NOTE: Pointer mapped by integer can't be NULL. 41 * 42 */ 43 44 45 #ifndef _IDR_H_ 46 #define _IDR_H_ 47 48 #ifdef _KERNEL 49 50 #include <sys/spinlock.h> 51 52 struct idr_node { 53 void *data; 54 char reserved; 55 int allocated; 56 }; 57 58 struct idr { 59 struct idr_node *idr_nodes; 60 int idr_count; 61 int idr_lastindex; 62 int idr_freeindex; 63 int idr_nexpands; 64 int idr_maxwant; 65 struct spinlock idr_spin; 66 }; 67 68 void *idr_find(struct idr *idp, int id); 69 void *idr_replace(struct idr *idp, void *ptr, int id); 70 void idr_remove(struct idr *idp, int id); 71 void idr_remove_all(struct idr *idp); 72 void idr_destroy(struct idr *idp); 73 int idr_for_each(struct idr *idp, int (*fn)(int id, void *p, void *data), void *data); 74 int idr_get_new(struct idr *idp, void *ptr, int *id); 75 int idr_get_new_above(struct idr *idp, void *ptr, int sid, int *id); 76 int idr_pre_get(struct idr *idp); 77 78 void idr_init1(struct idr *idp, int size); 79 void idr_init(struct idr *idp); 80 81 82 #endif /* _KERNEL */ 83 84 #endif /* _IDR_H_ */ 85