Subversion Repositories HelenOS

Rev

Rev 2787 | 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 
#ifndef KERN_AVLTREE_H_
36 
#define KERN_AVLTREE_H_
37 
 
38 
#include <arch/types.h>
3424 svoboda 39 
#include <typedefs.h>
2416 mencl 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 
 */
2501 jermar 49 
#define avltree_get_instance(node, type, member) \
50 
    ((type *)(((uint8_t *)(node)) - ((uint8_t *) &(((type *) NULL)->member))))
2416 mencl 51 
 
52 
typedef struct avltree_node avltree_node_t;
53 
typedef struct avltree avltree_t;
54 
 
2501 jermar 55 
typedef uint64_t avltree_key_t;
2416 mencl 56 
 
2504 jermar 57 
typedef bool (* avltree_walker_t)(avltree_node_t *, void *);
2501 jermar 58 
 
2416 mencl 59 
/** AVL tree node structure. */
60 
struct avltree_node
61 
{
62 
    /**
2496 jermar 63 
     * Pointer to the left descendant of this node.
2416 mencl 64 
     *
2496 jermar 65 
     * All keys of nodes in the left subtree are less than the key of this
66 
     * node.
2416 mencl 67 
     */
68 
    struct avltree_node *lft;
69 
 
70 
    /**
2496 jermar 71 
     * Pointer to the right descendant of this node.
2416 mencl 72 
     *
2496 jermar 73 
     * All keys of nodes in the right subtree are greater than the key of
74 
     * this node.
2416 mencl 75 
     */
76 
    struct avltree_node *rgt;
77 
 
2496 jermar 78 
    /** Pointer to the parent node. Root node has NULL parent. */
2416 mencl 79 
    struct avltree_node *par;
80 
 
2496 jermar 81 
    /** Node's key. */
2501 jermar 82 
    avltree_key_t key;
2416 mencl 83 
 
2496 jermar 84 
    /**
85 
     * Difference between the heights of the left and the right subtree of
86 
     * this node.
87 
     */
2466 mencl 88 
    int8_t balance;
2416 mencl 89 
};
90 
 
91 
/** AVL tree structure. */
92 
struct avltree
93 
{
94 
    /** AVL root node pointer */
95 
    struct avltree_node *root;
96 
 
97 
    /**
2496 jermar 98 
     * Base of the tree is a value that is smaller or equal than every value
99 
     * in the tree (valid for positive keys otherwise ignore this atribute).
2416 mencl 100 
     *  
2496 jermar 101 
     * The base is added to the current key when a new node is inserted into
102 
     * the tree. The base is changed to the key of the node which is deleted
103 
     * with avltree_delete_min().
2416 mencl 104 
     */
2501 jermar 105 
    avltree_key_t base;
2416 mencl 106 
};
107 
 
108 
 
109 
/** Create empty AVL tree.
110 
 *
111 
 * @param t AVL tree.
112 
 */
2501 jermar 113 
static inline void avltree_create(avltree_t *t)
2416 mencl 114 
{
115 
    t->root = NULL;
116 
    t->base = 0;
117 
}
118 
 
119 
/** Initialize node.
120 
 *
2496 jermar 121 
 * @param node Node which is initialized.
2416 mencl 122 
 */
123 
static inline void avltree_node_initialize(avltree_node_t *node)
124 
{
125 
    node->key = 0;
126 
    node->lft = NULL;
127 
    node->rgt = NULL;
128 
    node->par = NULL;
129 
    node->balance = 0;
130 
}
131 
 
2496 jermar 132 
extern avltree_node_t *avltree_find_min(avltree_t *t);
2501 jermar 133 
extern avltree_node_t *avltree_search(avltree_t *t, avltree_key_t key);
2496 jermar 134 
extern void avltree_insert(avltree_t *t, avltree_node_t *newnode);
135 
extern void avltree_delete(avltree_t *t, avltree_node_t *node);
136 
extern bool avltree_delete_min(avltree_t *t);
2504 jermar 137 
extern void avltree_walk(avltree_t *t, avltree_walker_t walker, void *arg);
2416 mencl 138 
 
139 
#endif
140 
 
141 
/** @}
142 
 */