Subversion Repositories HelenOS

Rev

Rev 2496 | Rev 2501 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
2416 mencl 1 
/*
2461 mencl 2 
 * Copyright (C) 2007 Vojtech Mencl
2416 mencl 3 
 * All rights reserved.
4 
 *
5 
 * Redistribution and use in source and binary forms, with or without
6 
 * modification, are permitted provided that the following conditions
7 
 * are met:
8 
 *
9 
 * - Redistributions of source code must retain the above copyright
10 
 *   notice, this list of conditions and the following disclaimer.
11 
 * - Redistributions in binary form must reproduce the above copyright
12 
 *   notice, this list of conditions and the following disclaimer in the
13 
 *   documentation and/or other materials provided with the distribution.
14 
 * - The name of the author may not be used to endorse or promote products
15 
 *   derived from this software without specific prior written permission.
16 
 *
17 
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 
 */
28 
 
29 
/** @addtogroup genericadt
30 
 * @{
31 
 */
32 
/** @file
33 
 */
34 
 
35 
 
36 
#ifndef KERN_AVLTREE_H_
37 
#define KERN_AVLTREE_H_
38 
 
39 
#include <arch/types.h>
40 
 
2496 jermar 41 
/**
42 
 * Macro for getting a pointer to the structure which contains the avltree
43 
 * structure.
2416 mencl 44 
 *
2496 jermar 45 
 * @param link Pointer to the avltree structure.
46 
 * @param type Name of the outer structure.
47 
 * @param member Name of avltree attribute in the outer structure.
2416 mencl 48 
 */
2496 jermar 49 
#define avltree_get_instance(link, type, member) \
50 
    ((type *)(((uint8_t *)(link)) - ((uint8_t *) &(((type *) NULL)->member))))
2416 mencl 51 
 
52 
 
53 
typedef struct avltree_node avltree_node_t;
54 
typedef struct avltree avltree_t;
55 
 
56 
 
57 
/** AVL tree node structure. */
58 
struct avltree_node
59 
{
60 
    /**
2496 jermar 61 
     * Pointer to the left descendant of this node.
2416 mencl 62 
     *
2496 jermar 63 
     * All keys of nodes in the left subtree are less than the key of this
64 
     * node.
2416 mencl 65 
     */
66 
    struct avltree_node *lft;
67 
 
68 
    /**
2496 jermar 69 
     * Pointer to the right descendant of this node.
2416 mencl 70 
     *
2496 jermar 71 
     * All keys of nodes in the right subtree are greater than the key of
72 
     * this node.
2416 mencl 73 
     */
74 
    struct avltree_node *rgt;
75 
 
2496 jermar 76 
    /** Pointer to the parent node. Root node has NULL parent. */
2416 mencl 77 
    struct avltree_node *par;
78 
 
2496 jermar 79 
    /** Node's key. */
2416 mencl 80 
    uint64_t key;
81 
 
2496 jermar 82 
    /**
83 
     * Difference between the heights of the left and the right subtree of
84 
     * this node.
85 
     */
2466 mencl 86 
    int8_t balance;
2416 mencl 87 
};
88 
 
89 
/** AVL tree structure. */
90 
struct avltree
91 
{
92 
    /** AVL root node pointer */
93 
    struct avltree_node *root;
94 
 
95 
    /**
2496 jermar 96 
     * Base of the tree is a value that is smaller or equal than every value
97 
     * in the tree (valid for positive keys otherwise ignore this atribute).
2416 mencl 98 
     *  
2496 jermar 99 
     * The base is added to the current key when a new node is inserted into
100 
     * the tree. The base is changed to the key of the node which is deleted
101 
     * with avltree_delete_min().
2416 mencl 102 
     */
2466 mencl 103 
    uint64_t base;
2416 mencl 104 
};
105 
 
106 
 
107 
/** Create empty AVL tree.
108 
 *
109 
 * @param t AVL tree.
110 
 */
111 
static inline void avltree_create (avltree_t *t)
112 
{
113 
    t->root = NULL;
114 
    t->base = 0;
115 
}
116 
 
117 
/** Initialize node.
118 
 *
2496 jermar 119 
 * @param node Node which is initialized.
2416 mencl 120 
 */
121 
static inline void avltree_node_initialize(avltree_node_t *node)
122 
{
123 
    node->key = 0;
124 
    node->lft = NULL;
125 
    node->rgt = NULL;
126 
    node->par = NULL;
127 
    node->balance = 0;
128 
}
129 
 
2496 jermar 130 
extern avltree_node_t *avltree_find_min(avltree_t *t);
131 
extern avltree_node_t *avltree_search(avltree_t *t, uint64_t key);
132 
extern void avltree_insert(avltree_t *t, avltree_node_t *newnode);
133 
extern void avltree_delete(avltree_t *t, avltree_node_t *node);
134 
extern bool avltree_delete_min(avltree_t *t);
2416 mencl 135 
 
136 
#endif
137 
 
138 
/** @}
139 
 */