Subversion Repositories HelenOS

Rev

Rev 788 | Rev 1780 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
1 jermar 1 
/*
2 
 * Copyright (C) 2001-2004 Jakub 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 
 
1702 cejka 29 
 /** @addtogroup genericadt
30 
 * @{
31 
 */
32 
/** @file
33 
 */
34 
 
1 jermar 35 
#ifndef __LIST_H__
36 
#define __LIST_H__
37 
 
38 
#include <arch/types.h>
39 
#include <typedefs.h>
40 
 
624 jermar 41 
/** Doubly linked list head and link type. */
1 jermar 42 
struct link {
624 jermar 43 
    link_t *prev;   /**< Pointer to the previous item in the list. */
44 
    link_t *next;   /**< Pointer to the next item in the list. */
1 jermar 45 
};
46 
 
624 jermar 47 
/** Declare and initialize statically allocated list.
48 
 *
49 
 * @param name Name of the new statically allocated list.
50 
 */
51 
#define LIST_INITIALIZE(name)       link_t name = { .prev = &name, .next = &name }
52 
 
380 jermar 53 
/** Initialize doubly-linked circular list link
54 
 *
55 
 * Initialize doubly-linked list link.
56 
 *
57 
 * @param link Pointer to link_t structure to be initialized.
58 
 */
365 jermar 59 
static inline void link_initialize(link_t *link)
60 
{
61 
    link->prev = NULL;
62 
    link->next = NULL;
1 jermar 63 
}
64 
 
380 jermar 65 
/** Initialize doubly-linked circular list
66 
 *
67 
 * Initialize doubly-linked circular list.
68 
 *
69 
 * @param head Pointer to link_t structure representing head of the list.
70 
 */
365 jermar 71 
static inline void list_initialize(link_t *head)
72 
{
73 
    head->prev = head;
74 
    head->next = head;
1 jermar 75 
}
76 
 
380 jermar 77 
/** Add item to the beginning of doubly-linked circular list
78 
 *
79 
 * Add item to the beginning of doubly-linked circular list.
80 
 *
81 
 * @param link Pointer to link_t structure to be added.
82 
 * @param head Pointer to link_t structure representing head of the list.
83 
 */
365 jermar 84 
static inline void list_prepend(link_t *link, link_t *head)
85 
{
86 
    link->next = head->next;
87 
    link->prev = head;
88 
    head->next->prev = link;
89 
    head->next = link;
1 jermar 90 
}
91 
 
380 jermar 92 
/** Add item to the end of doubly-linked circular list
93 
 *
94 
 * Add item to the end of doubly-linked circular list.
95 
 *
96 
 * @param link Pointer to link_t structure to be added.
97 
 * @param head Pointer to link_t structure representing head of the list.
98 
 */
365 jermar 99 
static inline void list_append(link_t *link, link_t *head)
100 
{
101 
    link->prev = head->prev;
102 
    link->next = head;
103 
    head->prev->next = link;
104 
    head->prev = link;
1 jermar 105 
}
106 
 
380 jermar 107 
/** Remove item from doubly-linked circular list
108 
 *
109 
 * Remove item from doubly-linked circular list.
110 
 *
111 
 * @param link Pointer to link_t structure to be removed from the list it is contained in.
112 
 */
365 jermar 113 
static inline void list_remove(link_t *link)
114 
{
115 
    link->next->prev = link->prev;
116 
    link->prev->next = link->next;
117 
    link_initialize(link);
1 jermar 118 
}
119 
 
380 jermar 120 
/** Query emptiness of doubly-linked circular list
121 
 *
122 
 * Query emptiness of doubly-linked circular list.
123 
 *
124 
 * @param head Pointer to link_t structure representing head of the list.
125 
 */
126 
static inline bool list_empty(link_t *head)
127 
{
128 
    return head->next == head ? true : false;
129 
}
1 jermar 130 
 
380 jermar 131 
 
132 
/** Split or concatenate headless doubly-linked circular list
133 
 *
134 
 * Split or concatenate headless doubly-linked circular list.
135 
 *
136 
 * Note that the algorithm works both directions:
137 
 * concatenates splitted lists and splits concatenated lists.
138 
 *
139 
 * @param part1 Pointer to link_t structure leading the first (half of the headless) list.
140 
 * @param part2 Pointer to link_t structure leading the second (half of the headless) list.
141 
 */
142 
static inline void headless_list_split_or_concat(link_t *part1, link_t *part2)
143 
{
144 
    link_t *hlp;
145 
 
146 
    part1->prev->next = part2;
147 
    part2->prev->next = part1; 
148 
    hlp = part1->prev;
149 
    part1->prev = part2->prev;
150 
    part2->prev = hlp;
151 
}
152 
 
153 
 
154 
/** Split headless doubly-linked circular list
155 
 *
156 
 * Split headless doubly-linked circular list.
157 
 *
158 
 * @param part1 Pointer to link_t structure leading the first half of the headless list.
159 
 * @param part2 Pointer to link_t structure leading the second half of the headless list.
160 
 */
161 
static inline void headless_list_split(link_t *part1, link_t *part2)
162 
{
163 
    headless_list_split_or_concat(part1, part2);
164 
}
165 
 
166 
/** Concatenate two headless doubly-linked circular lists
167 
 *
168 
 * Concatenate two headless doubly-linked circular lists.
169 
 *
170 
 * @param part1 Pointer to link_t structure leading the first headless list.
171 
 * @param part2 Pointer to link_t structure leading the second headless list.
172 
 */
173 
static inline void headless_list_concat(link_t *part1, link_t *part2)
174 
{
175 
    headless_list_split_or_concat(part1, part2);
176 
}
177 
 
1 jermar 178 
#define list_get_instance(link,type,member) (type *)(((__u8*)(link))-((__u8*)&(((type *)NULL)->member)))
179 
 
67 decky 180 
extern bool list_member(const link_t *link, const link_t *head);
1 jermar 181 
extern void list_concat(link_t *head1, link_t *head2);
182 
 
183 
#endif
1702 cejka 184 
 
185 
 /** @}
186 
 */
187