Subversion Repositories HelenOS

Rev

Rev 2787 | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
1 jermar 1 
/*
2071 jermar 2 
 * Copyright (c) 2001-2004 Jakub Jermar
1 jermar 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 
 
1888 jermar 29 
/** @addtogroup genericadt
1702 cejka 30 
 * @{
31 
 */
32 
/** @file
33 
 */
34 
 
1888 jermar 35 
#ifndef KERN_LIST_H_
36 
#define KERN_LIST_H_
1 jermar 37 
 
38 
#include <arch/types.h>
3424 svoboda 39 
#include <typedefs.h>
1 jermar 40 
 
624 jermar 41 
/** Doubly linked list head and link type. */
2089 decky 42 
typedef struct link {
43 
    struct link *prev;  /**< Pointer to the previous item in the list. */
44 
    struct link *next;  /**< Pointer to the next item in the list. */
45 
} link_t;
1 jermar 46 
 
624 jermar 47 
/** Declare and initialize statically allocated list.
48 
 *
49 
 * @param name Name of the new statically allocated list.
50 
 */
2106 jermar 51 
#define LIST_INITIALIZE(name) \
52 
    link_t name = { .prev = &name, .next = &name }
624 jermar 53 
 
380 jermar 54 
/** Initialize doubly-linked circular list link
55 
 *
56 
 * Initialize doubly-linked list link.
57 
 *
58 
 * @param link Pointer to link_t structure to be initialized.
59 
 */
365 jermar 60 
static inline void link_initialize(link_t *link)
61 
{
62 
    link->prev = NULL;
63 
    link->next = NULL;
1 jermar 64 
}
65 
 
380 jermar 66 
/** Initialize doubly-linked circular list
67 
 *
68 
 * Initialize doubly-linked circular list.
69 
 *
70 
 * @param head Pointer to link_t structure representing head of the list.
71 
 */
365 jermar 72 
static inline void list_initialize(link_t *head)
73 
{
74 
    head->prev = head;
75 
    head->next = head;
1 jermar 76 
}
77 
 
380 jermar 78 
/** Add item to the beginning of doubly-linked circular list
79 
 *
80 
 * Add item to the beginning of doubly-linked circular list.
81 
 *
82 
 * @param link Pointer to link_t structure to be added.
83 
 * @param head Pointer to link_t structure representing head of the list.
84 
 */
365 jermar 85 
static inline void list_prepend(link_t *link, link_t *head)
86 
{
87 
    link->next = head->next;
88 
    link->prev = head;
89 
    head->next->prev = link;
90 
    head->next = link;
1 jermar 91 
}
92 
 
380 jermar 93 
/** Add item to the end of doubly-linked circular list
94 
 *
95 
 * Add item to the end of doubly-linked circular list.
96 
 *
97 
 * @param link Pointer to link_t structure to be added.
98 
 * @param head Pointer to link_t structure representing head of the list.
99 
 */
365 jermar 100 
static inline void list_append(link_t *link, link_t *head)
101 
{
102 
    link->prev = head->prev;
103 
    link->next = head;
104 
    head->prev->next = link;
105 
    head->prev = link;
1 jermar 106 
}
107 
 
380 jermar 108 
/** Remove item from doubly-linked circular list
109 
 *
110 
 * Remove item from doubly-linked circular list.
111 
 *
2106 jermar 112 
 * @param link  Pointer to link_t structure to be removed from the list it is
113 
 *      contained in.
380 jermar 114 
 */
365 jermar 115 
static inline void list_remove(link_t *link)
116 
{
117 
    link->next->prev = link->prev;
118 
    link->prev->next = link->next;
119 
    link_initialize(link);
1 jermar 120 
}
121 
 
380 jermar 122 
/** Query emptiness of doubly-linked circular list
123 
 *
124 
 * Query emptiness of doubly-linked circular list.
125 
 *
126 
 * @param head Pointer to link_t structure representing head of the list.
127 
 */
128 
static inline bool list_empty(link_t *head)
129 
{
130 
    return head->next == head ? true : false;
131 
}
1 jermar 132 
 
380 jermar 133 
 
134 
/** Split or concatenate headless doubly-linked circular list
135 
 *
136 
 * Split or concatenate headless doubly-linked circular list.
137 
 *
138 
 * Note that the algorithm works both directions:
139 
 * concatenates splitted lists and splits concatenated lists.
140 
 *
2106 jermar 141 
 * @param part1 Pointer to link_t structure leading the first (half of the
142 
 *      headless) list.
143 
 * @param part2 Pointer to link_t structure leading the second (half of the
144 
 *      headless) list.
380 jermar 145 
 */
146 
static inline void headless_list_split_or_concat(link_t *part1, link_t *part2)
147 
{
148 
    link_t *hlp;
149 
 
150 
    part1->prev->next = part2;
151 
    part2->prev->next = part1; 
152 
    hlp = part1->prev;
153 
    part1->prev = part2->prev;
154 
    part2->prev = hlp;
155 
}
156 
 
157 
 
158 
/** Split headless doubly-linked circular list
159 
 *
160 
 * Split headless doubly-linked circular list.
161 
 *
2106 jermar 162 
 * @param part1 Pointer to link_t structure leading the first half of the
163 
 *      headless list.
164 
 * @param part2 Pointer to link_t structure leading the second half of the
165 
 *      headless list.
380 jermar 166 
 */
167 
static inline void headless_list_split(link_t *part1, link_t *part2)
168 
{
169 
    headless_list_split_or_concat(part1, part2);
170 
}
171 
 
172 
/** Concatenate two headless doubly-linked circular lists
173 
 *
174 
 * Concatenate two headless doubly-linked circular lists.
175 
 *
176 
 * @param part1 Pointer to link_t structure leading the first headless list.
2106 jermar 177 
 * @param part2 Pointer to link_t structure leading the second headless list.
380 jermar 178 
 */
179 
static inline void headless_list_concat(link_t *part1, link_t *part2)
180 
{
181 
    headless_list_split_or_concat(part1, part2);
182 
}
183 
 
2446 jermar 184 
#define list_get_instance(link, type, member) \
2106 jermar 185 
    ((type *)(((uint8_t *)(link)) - ((uint8_t *)&(((type *)NULL)->member))))
1 jermar 186 
 
67 decky 187 
extern bool list_member(const link_t *link, const link_t *head);
1 jermar 188 
extern void list_concat(link_t *head1, link_t *head2);
189 
 
190 
#endif
1702 cejka 191 
 
1888 jermar 192 
/** @}
1702 cejka 193 
 */