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annotate packages/net/tcpip/current/include/sys/queue.h @ 2729:74dbf4c3f2e1 after-copyright-change-20090129

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Update all copyright banners to reflect FSF ownership; fix and improve licence text.
author jlarmour
date Thu, 29 Jan 2009 17:47:46 +0000
parents e0c0827131d1
children
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1 //==========================================================================
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2 //
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3 // include/sys/queue.h
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4 //
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5 //
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6 //
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7 //==========================================================================
2729
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8 // ####BSDALTCOPYRIGHTBEGIN####
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9 // -------------------------------------------
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10 // Portions of this software may have been derived from OpenBSD
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11 // or other sources, and if so are covered by the appropriate copyright
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12 // and license included herein.
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13 // -------------------------------------------
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14 // ####BSDALTCOPYRIGHTEND####
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15 //==========================================================================
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16 //#####DESCRIPTIONBEGIN####
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17 //
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18 // Author(s): gthomas
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19 // Contributors: gthomas
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20 // Date: 2000-01-10
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21 // Purpose:
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22 // Description:
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23 //
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24 //
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25 //####DESCRIPTIONEND####
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26 //
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27 //==========================================================================
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30 /* $OpenBSD: queue.h,v 1.14 1999/09/08 08:20:04 espie Exp $ */
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31 /* $NetBSD: queue.h,v 1.11 1996/05/16 05:17:14 mycroft Exp $ */
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32
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33 /*
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34 * Copyright (c) 1991, 1993
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35 * The Regents of the University of California. All rights reserved.
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36 *
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37 * Redistribution and use in source and binary forms, with or without
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38 * modification, are permitted provided that the following conditions
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39 * are met:
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40 * 1. Redistributions of source code must retain the above copyright
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41 * notice, this list of conditions and the following disclaimer.
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42 * 2. Redistributions in binary form must reproduce the above copyright
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43 * notice, this list of conditions and the following disclaimer in the
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44 * documentation and/or other materials provided with the distribution.
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45 * 3. All advertising materials mentioning features or use of this software
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46 * must display the following acknowledgement:
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47 * This product includes software developed by the University of
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48 * California, Berkeley and its contributors.
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49 * 4. Neither the name of the University nor the names of its contributors
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50 * may be used to endorse or promote products derived from this software
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51 * without specific prior written permission.
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52 *
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53 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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54 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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55 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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56 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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57 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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58 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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59 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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61 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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62 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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63 * SUCH DAMAGE.
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64 *
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65 * @(#)queue.h 8.5 (Berkeley) 8/20/94
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66 */
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67
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68 #ifndef _SYS_QUEUE_H_
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69 #define _SYS_QUEUE_H_
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70
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71 /*
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72 * This file defines five types of data structures: singly-linked lists,
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73 * lists, simple queues, tail queues, and circular queues.
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74 *
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75 *
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76 * A singly-linked list is headed by a single forward pointer. The elements
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77 * are singly linked for minimum space and pointer manipulation overhead at
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78 * the expense of O(n) removal for arbitrary elements. New elements can be
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79 * added to the list after an existing element or at the head of the list.
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80 * Elements being removed from the head of the list should use the explicit
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81 * macro for this purpose for optimum efficiency. A singly-linked list may
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82 * only be traversed in the forward direction. Singly-linked lists are ideal
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83 * for applications with large datasets and few or no removals or for
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84 * implementing a LIFO queue.
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85 *
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86 * A list is headed by a single forward pointer (or an array of forward
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87 * pointers for a hash table header). The elements are doubly linked
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88 * so that an arbitrary element can be removed without a need to
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89 * traverse the list. New elements can be added to the list before
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90 * or after an existing element or at the head of the list. A list
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91 * may only be traversed in the forward direction.
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92 *
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93 * A simple queue is headed by a pair of pointers, one the head of the
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94 * list and the other to the tail of the list. The elements are singly
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95 * linked to save space, so elements can only be removed from the
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96 * head of the list. New elements can be added to the list before or after
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97 * an existing element, at the head of the list, or at the end of the
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98 * list. A simple queue may only be traversed in the forward direction.
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99 *
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100 * A tail queue is headed by a pair of pointers, one to the head of the
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101 * list and the other to the tail of the list. The elements are doubly
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102 * linked so that an arbitrary element can be removed without a need to
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103 * traverse the list. New elements can be added to the list before or
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104 * after an existing element, at the head of the list, or at the end of
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105 * the list. A tail queue may be traversed in either direction.
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106 *
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107 * A circle queue is headed by a pair of pointers, one to the head of the
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108 * list and the other to the tail of the list. The elements are doubly
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109 * linked so that an arbitrary element can be removed without a need to
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110 * traverse the list. New elements can be added to the list before or after
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111 * an existing element, at the head of the list, or at the end of the list.
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112 * A circle queue may be traversed in either direction, but has a more
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113 * complex end of list detection.
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114 *
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115 * For details on the use of these macros, see the queue(3) manual page.
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116 */
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117
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118 /*
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119 * Singly-linked List definitions.
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120 */
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121 #define SLIST_HEAD(name, type) \
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122 struct name { \
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123 struct type *slh_first; /* first element */ \
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124 }
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125
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126 #define SLIST_HEAD_INITIALIZER(head) \
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127 { NULL }
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128
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129 #define SLIST_ENTRY(type) \
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130 struct { \
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131 struct type *sle_next; /* next element */ \
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132 }
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133
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134 /*
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135 * Singly-linked List access methods.
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136 */
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137 #define SLIST_FIRST(head) ((head)->slh_first)
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138 #define SLIST_END(head) NULL
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139 #define SLIST_EMPTY(head) (SLIST_FIRST(head) == SLIST_END(head))
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140 #define SLIST_NEXT(elm, field) ((elm)->field.sle_next)
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141
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142 #define SLIST_FOREACH(var, head, field) \
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143 for((var) = SLIST_FIRST(head); \
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144 (var) != SLIST_END(head); \
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145 (var) = SLIST_NEXT(var, field))
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146
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147 /*
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148 * Singly-linked List functions.
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149 */
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150 #define SLIST_INIT(head) { \
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151 SLIST_FIRST(head) = SLIST_END(head); \
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152 }
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153
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154 #define SLIST_INSERT_AFTER(slistelm, elm, field) do { \
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155 (elm)->field.sle_next = (slistelm)->field.sle_next; \
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156 (slistelm)->field.sle_next = (elm); \
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157 } while (0)
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158
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159 #define SLIST_INSERT_HEAD(head, elm, field) do { \
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160 (elm)->field.sle_next = (head)->slh_first; \
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161 (head)->slh_first = (elm); \
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162 } while (0)
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163
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164 #define SLIST_REMOVE_HEAD(head, field) do { \
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165 (head)->slh_first = (head)->slh_first->field.sle_next; \
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166 } while (0)
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167
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168 /*
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169 * List definitions.
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170 */
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171 #define LIST_HEAD(name, type) \
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172 struct name { \
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173 struct type *lh_first; /* first element */ \
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174 }
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175
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176 #define LIST_HEAD_INITIALIZER(head) \
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177 { NULL }
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178
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179 #define LIST_ENTRY(type) \
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180 struct { \
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181 struct type *le_next; /* next element */ \
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182 struct type **le_prev; /* address of previous next element */ \
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183 }
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184
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185 /*
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186 * List access methods
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187 */
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188 #define LIST_FIRST(head) ((head)->lh_first)
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189 #define LIST_END(head) NULL
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190 #define LIST_EMPTY(head) (LIST_FIRST(head) == LIST_END(head))
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191 #define LIST_NEXT(elm, field) ((elm)->field.le_next)
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192
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193 #define LIST_FOREACH(var, head, field) \
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194 for((var) = LIST_FIRST(head); \
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195 (var)!= LIST_END(head); \
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196 (var) = LIST_NEXT(var, field))
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197
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198 /*
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199 * List functions.
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200 */
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201 #define LIST_INIT(head) do { \
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202 LIST_FIRST(head) = LIST_END(head); \
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203 } while (0)
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204
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205 #define LIST_INSERT_AFTER(listelm, elm, field) do { \
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206 if (((elm)->field.le_next = (listelm)->field.le_next) != NULL) \
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207 (listelm)->field.le_next->field.le_prev = \
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208 &(elm)->field.le_next; \
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209 (listelm)->field.le_next = (elm); \
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210 (elm)->field.le_prev = &(listelm)->field.le_next; \
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211 } while (0)
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212
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213 #define LIST_INSERT_BEFORE(listelm, elm, field) do { \
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214 (elm)->field.le_prev = (listelm)->field.le_prev; \
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215 (elm)->field.le_next = (listelm); \
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216 *(listelm)->field.le_prev = (elm); \
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217 (listelm)->field.le_prev = &(elm)->field.le_next; \
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218 } while (0)
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219
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220 #define LIST_INSERT_HEAD(head, elm, field) do { \
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221 if (((elm)->field.le_next = (head)->lh_first) != NULL) \
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222 (head)->lh_first->field.le_prev = &(elm)->field.le_next;\
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223 (head)->lh_first = (elm); \
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224 (elm)->field.le_prev = &(head)->lh_first; \
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225 } while (0)
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226
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227 #define LIST_REMOVE(elm, field) do { \
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228 if ((elm)->field.le_next != NULL) \
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229 (elm)->field.le_next->field.le_prev = \
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230 (elm)->field.le_prev; \
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231 *(elm)->field.le_prev = (elm)->field.le_next; \
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232 } while (0)
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233
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234 #define LIST_REPLACE(elm, elm2, field) do { \
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235 if (((elm2)->field.le_next = (elm)->field.le_next) != NULL) \
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236 (elm2)->field.le_next->field.le_prev = \
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237 &(elm2)->field.le_next; \
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238 (elm2)->field.le_prev = (elm)->field.le_prev; \
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239 *(elm2)->field.le_prev = (elm2); \
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240 } while (0)
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241
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242 /*
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243 * Simple queue definitions.
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244 */
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245 #define SIMPLEQ_HEAD(name, type) \
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246 struct name { \
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247 struct type *sqh_first; /* first element */ \
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248 struct type **sqh_last; /* addr of last next element */ \
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249 }
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250
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251 #define SIMPLEQ_HEAD_INITIALIZER(head) \
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252 { NULL, &(head).sqh_first }
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253
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254 #define SIMPLEQ_ENTRY(type) \
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255 struct { \
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256 struct type *sqe_next; /* next element */ \
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257 }
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258
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259 /*
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260 * Simple queue access methods.
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261 */
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262 #define SIMPLEQ_FIRST(head) ((head)->sqh_first)
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263 #define SIMPLEQ_END(head) NULL
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264 #define SIMPLEQ_EMPTY(head) (SIMPLEQ_FIRST(head) == SIMPLEQ_END(head))
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265 #define SIMPLEQ_NEXT(elm, field) ((elm)->field.sqe_next)
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266
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267 #define SIMPLEQ_FOREACH(var, head, field) \
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268 for((var) = SIMPLEQ_FIRST(head); \
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269 (var) != SIMPLEQ_END(head); \
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270 (var) = SIMPLEQ_NEXT(var, field))
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271
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272 /*
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273 * Simple queue functions.
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274 */
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275 #define SIMPLEQ_INIT(head) do { \
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276 (head)->sqh_first = NULL; \
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277 (head)->sqh_last = &(head)->sqh_first; \
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278 } while (0)
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279
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280 #define SIMPLEQ_INSERT_HEAD(head, elm, field) do { \
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281 if (((elm)->field.sqe_next = (head)->sqh_first) == NULL) \
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282 (head)->sqh_last = &(elm)->field.sqe_next; \
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283 (head)->sqh_first = (elm); \
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284 } while (0)
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285
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286 #define SIMPLEQ_INSERT_TAIL(head, elm, field) do { \
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287 (elm)->field.sqe_next = NULL; \
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288 *(head)->sqh_last = (elm); \
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289 (head)->sqh_last = &(elm)->field.sqe_next; \
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290 } while (0)
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291
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292 #define SIMPLEQ_INSERT_AFTER(head, listelm, elm, field) do { \
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293 if (((elm)->field.sqe_next = (listelm)->field.sqe_next) == NULL)\
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294 (head)->sqh_last = &(elm)->field.sqe_next; \
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295 (listelm)->field.sqe_next = (elm); \
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296 } while (0)
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297
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298 #define SIMPLEQ_REMOVE_HEAD(head, elm, field) do { \
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299 if (((head)->sqh_first = (elm)->field.sqe_next) == NULL) \
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300 (head)->sqh_last = &(head)->sqh_first; \
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301 } while (0)
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302
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303 /*
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304 * Tail queue definitions.
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305 */
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306 #define TAILQ_HEAD(name, type) \
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307 struct name { \
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308 struct type *tqh_first; /* first element */ \
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309 struct type **tqh_last; /* addr of last next element */ \
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310 }
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311
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312 #define TAILQ_HEAD_INITIALIZER(head) \
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313 { NULL, &(head).tqh_first }
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314
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315 #define TAILQ_ENTRY(type) \
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316 struct { \
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317 struct type *tqe_next; /* next element */ \
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318 struct type **tqe_prev; /* address of previous next element */ \
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319 }
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320
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321 /*
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322 * tail queue access methods
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323 */
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324 #define TAILQ_FIRST(head) ((head)->tqh_first)
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325 #define TAILQ_END(head) NULL
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326 #define TAILQ_NEXT(elm, field) ((elm)->field.tqe_next)
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327 #define TAILQ_LAST(head, headname) \
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328 (*(((struct headname *)((head)->tqh_last))->tqh_last))
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329 /* XXX */
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330 #define TAILQ_PREV(elm, headname, field) \
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331 (*(((struct headname *)((elm)->field.tqe_prev))->tqh_last))
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332 #define TAILQ_EMPTY(head) \
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333 (TAILQ_FIRST(head) == TAILQ_END(head))
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334
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335 #define TAILQ_FOREACH(var, head, field) \
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336 for((var) = TAILQ_FIRST(head); \
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337 (var) != TAILQ_END(head); \
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338 (var) = TAILQ_NEXT(var, field))
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339
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340 /*
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341 * Tail queue functions.
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342 */
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343 #define TAILQ_INIT(head) do { \
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344 (head)->tqh_first = NULL; \
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345 (head)->tqh_last = &(head)->tqh_first; \
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346 } while (0)
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347
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348 #define TAILQ_INSERT_HEAD(head, elm, field) do { \
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349 if (((elm)->field.tqe_next = (head)->tqh_first) != NULL) \
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350 (head)->tqh_first->field.tqe_prev = \
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351 &(elm)->field.tqe_next; \
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352 else \
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353 (head)->tqh_last = &(elm)->field.tqe_next; \
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354 (head)->tqh_first = (elm); \
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355 (elm)->field.tqe_prev = &(head)->tqh_first; \
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356 } while (0)
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357
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358 #define TAILQ_INSERT_TAIL(head, elm, field) do { \
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359 (elm)->field.tqe_next = NULL; \
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360 (elm)->field.tqe_prev = (head)->tqh_last; \
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361 *(head)->tqh_last = (elm); \
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362 (head)->tqh_last = &(elm)->field.tqe_next; \
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363 } while (0)
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364
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365 #define TAILQ_INSERT_AFTER(head, listelm, elm, field) do { \
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366 if (((elm)->field.tqe_next = (listelm)->field.tqe_next) != NULL)\
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367 (elm)->field.tqe_next->field.tqe_prev = \
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368 &(elm)->field.tqe_next; \
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369 else \
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370 (head)->tqh_last = &(elm)->field.tqe_next; \
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371 (listelm)->field.tqe_next = (elm); \
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372 (elm)->field.tqe_prev = &(listelm)->field.tqe_next; \
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373 } while (0)
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374
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375 #define TAILQ_INSERT_BEFORE(listelm, elm, field) do { \
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376 (elm)->field.tqe_prev = (listelm)->field.tqe_prev; \
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377 (elm)->field.tqe_next = (listelm); \
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378 *(listelm)->field.tqe_prev = (elm); \
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379 (listelm)->field.tqe_prev = &(elm)->field.tqe_next; \
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380 } while (0)
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381
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382 #define TAILQ_REMOVE(head, elm, field) do { \
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383 if (((elm)->field.tqe_next) != NULL) \
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384 (elm)->field.tqe_next->field.tqe_prev = \
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385 (elm)->field.tqe_prev; \
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386 else \
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387 (head)->tqh_last = (elm)->field.tqe_prev; \
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388 *(elm)->field.tqe_prev = (elm)->field.tqe_next; \
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389 } while (0)
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390
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391 #define TAILQ_REPLACE(head, elm, elm2, field) do { \
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392 if (((elm2)->field.tqe_next = (elm)->field.tqe_next) != NULL) \
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393 (elm2)->field.tqe_next->field.tqe_prev = \
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394 &(elm2)->field.le_next; \
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395 else \
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396 (head).tqh_last = &(elm2)->field.tqe_next; \
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397 (elm2)->field.tqe_prev = (elm)->field.tqe_prev; \
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398 *(elm2)->field.tqe_prev = (elm2); \
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399 } while (0)
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400
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401 /*
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402 * Circular queue definitions.
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403 */
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404 #define CIRCLEQ_HEAD(name, type) \
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405 struct name { \
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406 struct type *cqh_first; /* first element */ \
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407 struct type *cqh_last; /* last element */ \
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408 }
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409
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410 #define CIRCLEQ_HEAD_INITIALIZER(head) \
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411 { CIRCLEQ_END(&head), CIRCLEQ_END(&head) }
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412
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413 #define CIRCLEQ_ENTRY(type) \
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414 struct { \
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415 struct type *cqe_next; /* next element */ \
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416 struct type *cqe_prev; /* previous element */ \
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417 }
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418
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419 /*
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420 * Circular queue access methods
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421 */
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422 #define CIRCLEQ_FIRST(head) ((head)->cqh_first)
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423 #define CIRCLEQ_LAST(head) ((head)->cqh_last)
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424 #define CIRCLEQ_END(head) ((void *)(head))
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425 #define CIRCLEQ_NEXT(elm, field) ((elm)->field.cqe_next)
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426 #define CIRCLEQ_PREV(elm, field) ((elm)->field.cqe_prev)
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427 #define CIRCLEQ_EMPTY(head) \
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428 (CIRCLEQ_FIRST(head) == CIRCLEQ_END(head))
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429
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430 #define CIRCLEQ_FOREACH(var, head, field) \
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431 for((var) = CIRCLEQ_FIRST(head); \
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432 (var) != CIRCLEQ_END(head); \
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433 (var) = CIRCLEQ_NEXT(var, field))
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434
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435 #define CIRCLEQ_FOREACH_REVERSE(var, head, field) \
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436 for((var) = CIRCLEQ_LAST(head); \
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437 (var) != CIRCLEQ_END(head); \
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438 (var) = CIRCLEQ_PREV(var, field))
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439
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440 /*
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441 * Circular queue functions.
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442 */
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443 #define CIRCLEQ_INIT(head) do { \
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444 (head)->cqh_first = CIRCLEQ_END(head); \
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445 (head)->cqh_last = CIRCLEQ_END(head); \
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446 } while (0)
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447
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448 #define CIRCLEQ_INSERT_AFTER(head, listelm, elm, field) do { \
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449 (elm)->field.cqe_next = (listelm)->field.cqe_next; \
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450 (elm)->field.cqe_prev = (listelm); \
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451 if ((listelm)->field.cqe_next == CIRCLEQ_END(head)) \
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452 (head)->cqh_last = (elm); \
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453 else \
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454 (listelm)->field.cqe_next->field.cqe_prev = (elm); \
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455 (listelm)->field.cqe_next = (elm); \
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456 } while (0)
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457
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458 #define CIRCLEQ_INSERT_BEFORE(head, listelm, elm, field) do { \
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459 (elm)->field.cqe_next = (listelm); \
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460 (elm)->field.cqe_prev = (listelm)->field.cqe_prev; \
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461 if ((listelm)->field.cqe_prev == CIRCLEQ_END(head)) \
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462 (head)->cqh_first = (elm); \
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463 else \
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464 (listelm)->field.cqe_prev->field.cqe_next = (elm); \
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465 (listelm)->field.cqe_prev = (elm); \
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466 } while (0)
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467
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468 #define CIRCLEQ_INSERT_HEAD(head, elm, field) do { \
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469 (elm)->field.cqe_next = (head)->cqh_first; \
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470 (elm)->field.cqe_prev = CIRCLEQ_END(head); \
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471 if ((head)->cqh_last == CIRCLEQ_END(head)) \
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472 (head)->cqh_last = (elm); \
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473 else \
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474 (head)->cqh_first->field.cqe_prev = (elm); \
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475 (head)->cqh_first = (elm); \
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476 } while (0)
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477
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478 #define CIRCLEQ_INSERT_TAIL(head, elm, field) do { \
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479 (elm)->field.cqe_next = CIRCLEQ_END(head); \
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480 (elm)->field.cqe_prev = (head)->cqh_last; \
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481 if ((head)->cqh_first == CIRCLEQ_END(head)) \
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482 (head)->cqh_first = (elm); \
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483 else \
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484 (head)->cqh_last->field.cqe_next = (elm); \
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485 (head)->cqh_last = (elm); \
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486 } while (0)
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487
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488 #define CIRCLEQ_REMOVE(head, elm, field) do { \
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489 if ((elm)->field.cqe_next == CIRCLEQ_END(head)) \
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490 (head)->cqh_last = (elm)->field.cqe_prev; \
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491 else \
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492 (elm)->field.cqe_next->field.cqe_prev = \
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493 (elm)->field.cqe_prev; \
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494 if ((elm)->field.cqe_prev == CIRCLEQ_END(head)) \
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495 (head)->cqh_first = (elm)->field.cqe_next; \
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496 else \
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497 (elm)->field.cqe_prev->field.cqe_next = \
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498 (elm)->field.cqe_next; \
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499 } while (0)
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500
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501 #define CIRCLEQ_REPLACE(head, elm, elm2, field) do { \
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502 if (((elm2)->field.cqe_next = (elm)->field.cqe_next) == \
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503 CIRCLEQ_END(head)) \
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504 (head).cqh_last = (elm2); \
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505 else \
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506 (elm2)->field.cqe_next->field.cqe_prev = (elm2); \
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507 if (((elm2)->field.cqe_prev = (elm)->field.cqe_prev) == \
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508 CIRCLEQ_END(head)) \
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509 (head).cqh_first = (elm2); \
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510 else \
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511 (elm2)->field.cqe_prev->field.cqe_next = (elm2); \
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512 } while (0)
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513
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514 #endif /* !_SYS_QUEUE_H_ */