1 | /* |
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2 | * Copyright (c) 1991, 1993 |
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3 | * The Regents of the University of California. All rights reserved. |
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4 | * |
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5 | * Redistribution and use in source and binary forms, with or without |
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6 | * modification, are permitted provided that the following conditions |
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7 | * are met: |
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8 | * 1. Redistributions of source code must retain the above copyright |
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9 | * notice, this list of conditions and the following disclaimer. |
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10 | * 2. Redistributions in binary form must reproduce the above copyright |
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11 | * notice, this list of conditions and the following disclaimer in the |
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12 | * documentation and/or other materials provided with the distribution. |
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13 | * 3. All advertising materials mentioning features or use of this software |
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14 | * must display the following acknowledgement: |
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15 | * This product includes software developed by the University of |
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16 | * California, Berkeley and its contributors. |
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17 | * 4. Neither the name of the University nor the names of its contributors |
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18 | * may be used to endorse or promote products derived from this software |
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19 | * without specific prior written permission. |
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20 | * |
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21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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31 | * SUCH DAMAGE. |
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32 | * |
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33 | * @(#)queue.h 8.5 (Berkeley) 8/20/94 |
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34 | * $FreeBSD: src/sys/sys/queue.h,v 1.54 2002/08/05 05:18:43 alfred Exp $ |
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35 | */ |
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36 | |
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37 | #ifndef _SYS_QUEUE_H_ |
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38 | #define _SYS_QUEUE_H_ |
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39 | |
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40 | #include <sys/cdefs.h> |
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41 | |
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42 | /* |
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43 | * This file defines four types of data structures: singly-linked lists, |
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44 | * singly-linked tail queues, lists and tail queues. |
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45 | * |
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46 | * A singly-linked list is headed by a single forward pointer. The elements |
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47 | * are singly linked for minimum space and pointer manipulation overhead at |
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48 | * the expense of O(n) removal for arbitrary elements. New elements can be |
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49 | * added to the list after an existing element or at the head of the list. |
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50 | * Elements being removed from the head of the list should use the explicit |
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51 | * macro for this purpose for optimum efficiency. A singly-linked list may |
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52 | * only be traversed in the forward direction. Singly-linked lists are ideal |
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53 | * for applications with large datasets and few or no removals or for |
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54 | * implementing a LIFO queue. |
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55 | * |
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56 | * A singly-linked tail queue is headed by a pair of pointers, one to the |
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57 | * head of the list and the other to the tail of the list. The elements are |
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58 | * singly linked for minimum space and pointer manipulation overhead at the |
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59 | * expense of O(n) removal for arbitrary elements. New elements can be added |
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60 | * to the list after an existing element, at the head of the list, or at the |
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61 | * end of the list. Elements being removed from the head of the tail queue |
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62 | * should use the explicit macro for this purpose for optimum efficiency. |
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63 | * A singly-linked tail queue may only be traversed in the forward direction. |
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64 | * Singly-linked tail queues are ideal for applications with large datasets |
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65 | * and few or no removals or for implementing a FIFO queue. |
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66 | * |
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67 | * A list is headed by a single forward pointer (or an array of forward |
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68 | * pointers for a hash table header). The elements are doubly linked |
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69 | * so that an arbitrary element can be removed without a need to |
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70 | * traverse the list. New elements can be added to the list before |
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71 | * or after an existing element or at the head of the list. A list |
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72 | * may only be traversed in the forward direction. |
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73 | * |
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74 | * A tail queue is headed by a pair of pointers, one to the head of the |
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75 | * list and the other to the tail of the list. The elements are doubly |
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76 | * linked so that an arbitrary element can be removed without a need to |
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77 | * traverse the list. New elements can be added to the list before or |
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78 | * after an existing element, at the head of the list, or at the end of |
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79 | * the list. A tail queue may be traversed in either direction. |
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80 | * |
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81 | * For details on the use of these macros, see the queue(3) manual page. |
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82 | * |
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83 | * |
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84 | * SLIST LIST STAILQ TAILQ |
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85 | * _HEAD + + + + |
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86 | * _HEAD_INITIALIZER + + + + |
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87 | * _ENTRY + + + + |
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88 | * _INIT + + + + |
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89 | * _EMPTY + + + + |
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90 | * _FIRST + + + + |
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91 | * _NEXT + + + + |
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92 | * _PREV - - - + |
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93 | * _LAST - - + + |
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94 | * _FOREACH + + + + |
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95 | * _FOREACH_REVERSE - - - + |
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96 | * _INSERT_HEAD + + + + |
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97 | * _INSERT_BEFORE - + - + |
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98 | * _INSERT_AFTER + + + + |
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99 | * _INSERT_TAIL - - + + |
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100 | * _CONCAT - - + + |
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101 | * _REMOVE_HEAD + - + - |
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102 | * _REMOVE + + + + |
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103 | * |
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104 | */ |
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105 | #define QUEUE_MACRO_DEBUG 0 |
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106 | #if QUEUE_MACRO_DEBUG |
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107 | /* Store the last 2 places the queue element or head was altered */ |
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108 | struct qm_trace { |
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109 | char * lastfile; |
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110 | int lastline; |
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111 | char * prevfile; |
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112 | int prevline; |
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113 | }; |
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114 | |
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115 | #define TRACEBUF struct qm_trace trace; |
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116 | #define TRASHIT(x) do {(x) = (void *)-1;} while (0) |
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117 | |
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118 | #define QMD_TRACE_HEAD(head) do { \ |
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119 | (head)->trace.prevline = (head)->trace.lastline; \ |
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120 | (head)->trace.prevfile = (head)->trace.lastfile; \ |
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121 | (head)->trace.lastline = __LINE__; \ |
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122 | (head)->trace.lastfile = __FILE__; \ |
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123 | } while (0) |
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124 | |
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125 | #define QMD_TRACE_ELEM(elem) do { \ |
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126 | (elem)->trace.prevline = (elem)->trace.lastline; \ |
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127 | (elem)->trace.prevfile = (elem)->trace.lastfile; \ |
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128 | (elem)->trace.lastline = __LINE__; \ |
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129 | (elem)->trace.lastfile = __FILE__; \ |
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130 | } while (0) |
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131 | |
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132 | #else |
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133 | #define QMD_TRACE_ELEM(elem) |
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134 | #define QMD_TRACE_HEAD(head) |
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135 | #define TRACEBUF |
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136 | #define TRASHIT(x) |
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137 | #endif /* QUEUE_MACRO_DEBUG */ |
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138 | |
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139 | /* |
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140 | * Singly-linked List declarations. |
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141 | */ |
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142 | #define SLIST_HEAD(name, type) \ |
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143 | struct name { \ |
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144 | struct type *slh_first; /* first element */ \ |
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145 | } |
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146 | |
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147 | #define SLIST_HEAD_INITIALIZER(head) \ |
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148 | { NULL } |
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149 | |
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150 | #define SLIST_ENTRY(type) \ |
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151 | struct { \ |
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152 | struct type *sle_next; /* next element */ \ |
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153 | } |
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154 | |
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155 | /* |
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156 | * Singly-linked List functions. |
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157 | */ |
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158 | #define SLIST_EMPTY(head) ((head)->slh_first == NULL) |
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159 | |
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160 | #define SLIST_FIRST(head) ((head)->slh_first) |
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161 | |
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162 | #define SLIST_FOREACH(var, head, field) \ |
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163 | for ((var) = SLIST_FIRST((head)); \ |
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164 | (var); \ |
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165 | (var) = SLIST_NEXT((var), field)) |
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166 | |
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167 | #define SLIST_FOREACH_PREVPTR(var, varp, head, field) \ |
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168 | for ((varp) = &SLIST_FIRST((head)); \ |
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169 | ((var) = *(varp)) != NULL; \ |
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170 | (varp) = &SLIST_NEXT((var), field)) |
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171 | |
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172 | #define SLIST_INIT(head) do { \ |
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173 | SLIST_FIRST((head)) = NULL; \ |
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174 | } while (0) |
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175 | |
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176 | #define SLIST_INSERT_AFTER(slistelm, elm, field) do { \ |
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177 | SLIST_NEXT((elm), field) = SLIST_NEXT((slistelm), field); \ |
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178 | SLIST_NEXT((slistelm), field) = (elm); \ |
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179 | } while (0) |
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180 | |
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181 | #define SLIST_INSERT_HEAD(head, elm, field) do { \ |
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182 | SLIST_NEXT((elm), field) = SLIST_FIRST((head)); \ |
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183 | SLIST_FIRST((head)) = (elm); \ |
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184 | } while (0) |
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185 | |
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186 | #define SLIST_NEXT(elm, field) ((elm)->field.sle_next) |
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187 | |
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188 | #define SLIST_REMOVE(head, elm, type, field) do { \ |
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189 | if (SLIST_FIRST((head)) == (elm)) { \ |
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190 | SLIST_REMOVE_HEAD((head), field); \ |
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191 | } \ |
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192 | else { \ |
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193 | struct type *curelm = SLIST_FIRST((head)); \ |
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194 | while (SLIST_NEXT(curelm, field) != (elm)) \ |
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195 | curelm = SLIST_NEXT(curelm, field); \ |
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196 | SLIST_NEXT(curelm, field) = \ |
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197 | SLIST_NEXT(SLIST_NEXT(curelm, field), field); \ |
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198 | } \ |
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199 | } while (0) |
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200 | |
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201 | #define SLIST_REMOVE_HEAD(head, field) do { \ |
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202 | SLIST_FIRST((head)) = SLIST_NEXT(SLIST_FIRST((head)), field); \ |
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203 | } while (0) |
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204 | |
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205 | /* |
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206 | * Singly-linked Tail queue declarations. |
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207 | */ |
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208 | #define STAILQ_HEAD(name, type) \ |
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209 | struct name { \ |
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210 | struct type *stqh_first;/* first element */ \ |
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211 | struct type **stqh_last;/* addr of last next element */ \ |
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212 | } |
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213 | |
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214 | #define STAILQ_HEAD_INITIALIZER(head) \ |
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215 | { NULL, &(head).stqh_first } |
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216 | |
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217 | #define STAILQ_ENTRY(type) \ |
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218 | struct { \ |
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219 | struct type *stqe_next; /* next element */ \ |
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220 | } |
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221 | |
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222 | /* |
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223 | * Singly-linked Tail queue functions. |
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224 | */ |
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225 | #define STAILQ_CONCAT(head1, head2) do { \ |
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226 | if (!STAILQ_EMPTY((head2))) { \ |
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227 | *(head1)->stqh_last = (head2)->stqh_first; \ |
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228 | (head1)->stqh_last = (head2)->stqh_last; \ |
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229 | STAILQ_INIT((head2)); \ |
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230 | } \ |
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231 | } while (0) |
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232 | |
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233 | #define STAILQ_EMPTY(head) ((head)->stqh_first == NULL) |
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234 | |
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235 | #define STAILQ_FIRST(head) ((head)->stqh_first) |
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236 | |
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237 | #define STAILQ_FOREACH(var, head, field) \ |
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238 | for((var) = STAILQ_FIRST((head)); \ |
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239 | (var); \ |
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240 | (var) = STAILQ_NEXT((var), field)) |
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241 | |
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242 | #define STAILQ_INIT(head) do { \ |
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243 | STAILQ_FIRST((head)) = NULL; \ |
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244 | (head)->stqh_last = &STAILQ_FIRST((head)); \ |
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245 | } while (0) |
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246 | |
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247 | #define STAILQ_INSERT_AFTER(head, tqelm, elm, field) do { \ |
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248 | if ((STAILQ_NEXT((elm), field) = STAILQ_NEXT((tqelm), field)) == NULL)\ |
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249 | (head)->stqh_last = &STAILQ_NEXT((elm), field); \ |
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250 | STAILQ_NEXT((tqelm), field) = (elm); \ |
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251 | } while (0) |
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252 | |
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253 | #define STAILQ_INSERT_HEAD(head, elm, field) do { \ |
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254 | if ((STAILQ_NEXT((elm), field) = STAILQ_FIRST((head))) == NULL) \ |
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255 | (head)->stqh_last = &STAILQ_NEXT((elm), field); \ |
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256 | STAILQ_FIRST((head)) = (elm); \ |
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257 | } while (0) |
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258 | |
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259 | #define STAILQ_INSERT_TAIL(head, elm, field) do { \ |
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260 | STAILQ_NEXT((elm), field) = NULL; \ |
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261 | *(head)->stqh_last = (elm); \ |
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262 | (head)->stqh_last = &STAILQ_NEXT((elm), field); \ |
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263 | } while (0) |
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264 | |
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265 | #define STAILQ_LAST(head, type, field) \ |
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266 | (STAILQ_EMPTY((head)) ? \ |
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267 | NULL : \ |
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268 | ((struct type *) \ |
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269 | ((char *)((head)->stqh_last) - __offsetof(struct type, field)))) |
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270 | |
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271 | #define STAILQ_NEXT(elm, field) ((elm)->field.stqe_next) |
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272 | |
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273 | #define STAILQ_REMOVE(head, elm, type, field) do { \ |
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274 | if (STAILQ_FIRST((head)) == (elm)) { \ |
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275 | STAILQ_REMOVE_HEAD((head), field); \ |
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276 | } \ |
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277 | else { \ |
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278 | struct type *curelm = STAILQ_FIRST((head)); \ |
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279 | while (STAILQ_NEXT(curelm, field) != (elm)) \ |
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280 | curelm = STAILQ_NEXT(curelm, field); \ |
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281 | if ((STAILQ_NEXT(curelm, field) = \ |
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282 | STAILQ_NEXT(STAILQ_NEXT(curelm, field), field)) == NULL)\ |
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283 | (head)->stqh_last = &STAILQ_NEXT((curelm), field);\ |
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284 | } \ |
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285 | } while (0) |
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286 | |
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287 | #define STAILQ_REMOVE_HEAD(head, field) do { \ |
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288 | if ((STAILQ_FIRST((head)) = \ |
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289 | STAILQ_NEXT(STAILQ_FIRST((head)), field)) == NULL) \ |
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290 | (head)->stqh_last = &STAILQ_FIRST((head)); \ |
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291 | } while (0) |
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292 | |
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293 | #define STAILQ_REMOVE_HEAD_UNTIL(head, elm, field) do { \ |
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294 | if ((STAILQ_FIRST((head)) = STAILQ_NEXT((elm), field)) == NULL) \ |
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295 | (head)->stqh_last = &STAILQ_FIRST((head)); \ |
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296 | } while (0) |
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297 | |
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298 | /* |
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299 | * List declarations. |
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300 | */ |
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301 | #define LIST_HEAD(name, type) \ |
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302 | struct name { \ |
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303 | struct type *lh_first; /* first element */ \ |
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304 | } |
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305 | |
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306 | #define LIST_HEAD_INITIALIZER(head) \ |
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307 | { NULL } |
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308 | |
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309 | #define LIST_ENTRY(type) \ |
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310 | struct { \ |
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311 | struct type *le_next; /* next element */ \ |
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312 | struct type **le_prev; /* address of previous next element */ \ |
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313 | } |
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314 | |
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315 | /* |
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316 | * List functions. |
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317 | */ |
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318 | |
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319 | #define LIST_EMPTY(head) ((head)->lh_first == NULL) |
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320 | |
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321 | #define LIST_FIRST(head) ((head)->lh_first) |
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322 | |
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323 | #define LIST_FOREACH(var, head, field) \ |
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324 | for ((var) = LIST_FIRST((head)); \ |
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325 | (var); \ |
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326 | (var) = LIST_NEXT((var), field)) |
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327 | |
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328 | #define LIST_INIT(head) do { \ |
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329 | LIST_FIRST((head)) = NULL; \ |
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330 | } while (0) |
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331 | |
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332 | #define LIST_INSERT_AFTER(listelm, elm, field) do { \ |
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333 | if ((LIST_NEXT((elm), field) = LIST_NEXT((listelm), field)) != NULL)\ |
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334 | LIST_NEXT((listelm), field)->field.le_prev = \ |
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335 | &LIST_NEXT((elm), field); \ |
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336 | LIST_NEXT((listelm), field) = (elm); \ |
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337 | (elm)->field.le_prev = &LIST_NEXT((listelm), field); \ |
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338 | } while (0) |
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339 | |
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340 | #define LIST_INSERT_BEFORE(listelm, elm, field) do { \ |
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341 | (elm)->field.le_prev = (listelm)->field.le_prev; \ |
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342 | LIST_NEXT((elm), field) = (listelm); \ |
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343 | *(listelm)->field.le_prev = (elm); \ |
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344 | (listelm)->field.le_prev = &LIST_NEXT((elm), field); \ |
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345 | } while (0) |
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346 | |
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347 | #define LIST_INSERT_HEAD(head, elm, field) do { \ |
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348 | if ((LIST_NEXT((elm), field) = LIST_FIRST((head))) != NULL) \ |
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349 | LIST_FIRST((head))->field.le_prev = &LIST_NEXT((elm), field);\ |
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350 | LIST_FIRST((head)) = (elm); \ |
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351 | (elm)->field.le_prev = &LIST_FIRST((head)); \ |
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352 | } while (0) |
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353 | |
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354 | #define LIST_NEXT(elm, field) ((elm)->field.le_next) |
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355 | |
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356 | #define LIST_REMOVE(elm, field) do { \ |
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357 | if (LIST_NEXT((elm), field) != NULL) \ |
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358 | LIST_NEXT((elm), field)->field.le_prev = \ |
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359 | (elm)->field.le_prev; \ |
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360 | *(elm)->field.le_prev = LIST_NEXT((elm), field); \ |
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361 | } while (0) |
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362 | |
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363 | /* |
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364 | * Tail queue declarations. |
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365 | */ |
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366 | #define TAILQ_HEAD(name, type) \ |
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367 | struct name { \ |
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368 | struct type *tqh_first; /* first element */ \ |
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369 | struct type **tqh_last; /* addr of last next element */ \ |
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370 | TRACEBUF \ |
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371 | } |
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372 | |
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373 | #define TAILQ_HEAD_INITIALIZER(head) \ |
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374 | { NULL, &(head).tqh_first } |
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375 | |
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376 | #define TAILQ_ENTRY(type) \ |
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377 | struct { \ |
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378 | struct type *tqe_next; /* next element */ \ |
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379 | struct type **tqe_prev; /* address of previous next element */ \ |
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380 | TRACEBUF \ |
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381 | } |
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382 | |
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383 | /* |
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384 | * Tail queue functions. |
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385 | */ |
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386 | #define TAILQ_CONCAT(head1, head2, field) do { \ |
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387 | if (!TAILQ_EMPTY(head2)) { \ |
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388 | *(head1)->tqh_last = (head2)->tqh_first; \ |
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389 | (head2)->tqh_first->field.tqe_prev = (head1)->tqh_last; \ |
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390 | (head1)->tqh_last = (head2)->tqh_last; \ |
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391 | TAILQ_INIT((head2)); \ |
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392 | QMD_TRACE_HEAD(head); \ |
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393 | QMD_TRACE_HEAD(head2); \ |
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394 | } \ |
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395 | } while (0) |
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396 | |
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397 | #define TAILQ_EMPTY(head) ((head)->tqh_first == NULL) |
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398 | |
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399 | #define TAILQ_FIRST(head) ((head)->tqh_first) |
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400 | |
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401 | #define TAILQ_FOREACH(var, head, field) \ |
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402 | for ((var) = TAILQ_FIRST((head)); \ |
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403 | (var); \ |
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404 | (var) = TAILQ_NEXT((var), field)) |
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405 | |
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406 | #define TAILQ_FOREACH_REVERSE(var, head, headname, field) \ |
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407 | for ((var) = TAILQ_LAST((head), headname); \ |
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408 | (var); \ |
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409 | (var) = TAILQ_PREV((var), headname, field)) |
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410 | |
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411 | #define TAILQ_INIT(head) do { \ |
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412 | TAILQ_FIRST((head)) = NULL; \ |
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413 | (head)->tqh_last = &TAILQ_FIRST((head)); \ |
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414 | QMD_TRACE_HEAD(head); \ |
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415 | } while (0) |
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416 | |
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417 | #define TAILQ_INSERT_AFTER(head, listelm, elm, field) do { \ |
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418 | if ((TAILQ_NEXT((elm), field) = TAILQ_NEXT((listelm), field)) != NULL)\ |
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419 | TAILQ_NEXT((elm), field)->field.tqe_prev = \ |
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420 | &TAILQ_NEXT((elm), field); \ |
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421 | else { \ |
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422 | (head)->tqh_last = &TAILQ_NEXT((elm), field); \ |
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423 | QMD_TRACE_HEAD(head); \ |
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424 | } \ |
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425 | TAILQ_NEXT((listelm), field) = (elm); \ |
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426 | (elm)->field.tqe_prev = &TAILQ_NEXT((listelm), field); \ |
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427 | QMD_TRACE_ELEM(&(elm)->field); \ |
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428 | QMD_TRACE_ELEM(&listelm->field); \ |
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429 | } while (0) |
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430 | |
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431 | #define TAILQ_INSERT_BEFORE(listelm, elm, field) do { \ |
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432 | (elm)->field.tqe_prev = (listelm)->field.tqe_prev; \ |
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433 | TAILQ_NEXT((elm), field) = (listelm); \ |
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434 | *(listelm)->field.tqe_prev = (elm); \ |
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435 | (listelm)->field.tqe_prev = &TAILQ_NEXT((elm), field); \ |
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436 | QMD_TRACE_ELEM(&(elm)->field); \ |
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437 | QMD_TRACE_ELEM(&listelm->field); \ |
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438 | } while (0) |
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439 | |
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440 | #define TAILQ_INSERT_HEAD(head, elm, field) do { \ |
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441 | if ((TAILQ_NEXT((elm), field) = TAILQ_FIRST((head))) != NULL) \ |
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442 | TAILQ_FIRST((head))->field.tqe_prev = \ |
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443 | &TAILQ_NEXT((elm), field); \ |
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444 | else \ |
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445 | (head)->tqh_last = &TAILQ_NEXT((elm), field); \ |
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446 | TAILQ_FIRST((head)) = (elm); \ |
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447 | (elm)->field.tqe_prev = &TAILQ_FIRST((head)); \ |
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448 | QMD_TRACE_HEAD(head); \ |
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449 | QMD_TRACE_ELEM(&(elm)->field); \ |
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450 | } while (0) |
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451 | |
---|
452 | #define TAILQ_INSERT_TAIL(head, elm, field) do { \ |
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453 | TAILQ_NEXT((elm), field) = NULL; \ |
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454 | (elm)->field.tqe_prev = (head)->tqh_last; \ |
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455 | *(head)->tqh_last = (elm); \ |
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456 | (head)->tqh_last = &TAILQ_NEXT((elm), field); \ |
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457 | QMD_TRACE_HEAD(head); \ |
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458 | QMD_TRACE_ELEM(&(elm)->field); \ |
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459 | } while (0) |
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460 | |
---|
461 | #define TAILQ_LAST(head, headname) \ |
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462 | (*(((struct headname *)((head)->tqh_last))->tqh_last)) |
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463 | |
---|
464 | #define TAILQ_NEXT(elm, field) ((elm)->field.tqe_next) |
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465 | |
---|
466 | #define TAILQ_PREV(elm, headname, field) \ |
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467 | (*(((struct headname *)((elm)->field.tqe_prev))->tqh_last)) |
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468 | |
---|
469 | #define TAILQ_REMOVE(head, elm, field) do { \ |
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470 | if ((TAILQ_NEXT((elm), field)) != NULL) \ |
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471 | TAILQ_NEXT((elm), field)->field.tqe_prev = \ |
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472 | (elm)->field.tqe_prev; \ |
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473 | else { \ |
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474 | (head)->tqh_last = (elm)->field.tqe_prev; \ |
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475 | QMD_TRACE_HEAD(head); \ |
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476 | } \ |
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477 | *(elm)->field.tqe_prev = TAILQ_NEXT((elm), field); \ |
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478 | TRASHIT((elm)->field.tqe_next); \ |
---|
479 | TRASHIT((elm)->field.tqe_prev); \ |
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480 | QMD_TRACE_ELEM(&(elm)->field); \ |
---|
481 | } while (0) |
---|
482 | |
---|
483 | |
---|
484 | /* |
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485 | * Circular queue definitions. |
---|
486 | */ |
---|
487 | #define CIRCLEQ_HEAD(name, type) \ |
---|
488 | struct name { \ |
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489 | struct type *cqh_first; /* first element */ \ |
---|
490 | struct type *cqh_last; /* last element */ \ |
---|
491 | } |
---|
492 | |
---|
493 | #define CIRCLEQ_ENTRY(type) \ |
---|
494 | struct { \ |
---|
495 | struct type *cqe_next; /* next element */ \ |
---|
496 | struct type *cqe_prev; /* previous element */ \ |
---|
497 | } |
---|
498 | |
---|
499 | /* |
---|
500 | * Circular queue functions. |
---|
501 | */ |
---|
502 | #define CIRCLEQ_INIT(head) { \ |
---|
503 | (head)->cqh_first = (void *)(head); \ |
---|
504 | (head)->cqh_last = (void *)(head); \ |
---|
505 | } |
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506 | |
---|
507 | #define CIRCLEQ_INSERT_AFTER(head, listelm, elm, field) { \ |
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508 | (elm)->field.cqe_next = (listelm)->field.cqe_next; \ |
---|
509 | (elm)->field.cqe_prev = (listelm); \ |
---|
510 | if ((listelm)->field.cqe_next == (void *)(head)) \ |
---|
511 | (head)->cqh_last = (elm); \ |
---|
512 | else \ |
---|
513 | (listelm)->field.cqe_next->field.cqe_prev = (elm); \ |
---|
514 | (listelm)->field.cqe_next = (elm); \ |
---|
515 | } |
---|
516 | |
---|
517 | #define CIRCLEQ_INSERT_BEFORE(head, listelm, elm, field) { \ |
---|
518 | (elm)->field.cqe_next = (listelm); \ |
---|
519 | (elm)->field.cqe_prev = (listelm)->field.cqe_prev; \ |
---|
520 | if ((listelm)->field.cqe_prev == (void *)(head)) \ |
---|
521 | (head)->cqh_first = (elm); \ |
---|
522 | else \ |
---|
523 | (listelm)->field.cqe_prev->field.cqe_next = (elm); \ |
---|
524 | (listelm)->field.cqe_prev = (elm); \ |
---|
525 | } |
---|
526 | |
---|
527 | #define CIRCLEQ_INSERT_HEAD(head, elm, field) { \ |
---|
528 | (elm)->field.cqe_next = (head)->cqh_first; \ |
---|
529 | (elm)->field.cqe_prev = (void *)(head); \ |
---|
530 | if ((head)->cqh_last == (void *)(head)) \ |
---|
531 | (head)->cqh_last = (elm); \ |
---|
532 | else \ |
---|
533 | (head)->cqh_first->field.cqe_prev = (elm); \ |
---|
534 | (head)->cqh_first = (elm); \ |
---|
535 | } |
---|
536 | |
---|
537 | #define CIRCLEQ_INSERT_TAIL(head, elm, field) { \ |
---|
538 | (elm)->field.cqe_next = (void *)(head); \ |
---|
539 | (elm)->field.cqe_prev = (head)->cqh_last; \ |
---|
540 | if ((head)->cqh_first == (void *)(head)) \ |
---|
541 | (head)->cqh_first = (elm); \ |
---|
542 | else \ |
---|
543 | (head)->cqh_last->field.cqe_next = (elm); \ |
---|
544 | (head)->cqh_last = (elm); \ |
---|
545 | } |
---|
546 | |
---|
547 | #define CIRCLEQ_REMOVE(head, elm, field) { \ |
---|
548 | if ((elm)->field.cqe_next == (void *)(head)) \ |
---|
549 | (head)->cqh_last = (elm)->field.cqe_prev; \ |
---|
550 | else \ |
---|
551 | (elm)->field.cqe_next->field.cqe_prev = \ |
---|
552 | (elm)->field.cqe_prev; \ |
---|
553 | if ((elm)->field.cqe_prev == (void *)(head)) \ |
---|
554 | (head)->cqh_first = (elm)->field.cqe_next; \ |
---|
555 | else \ |
---|
556 | (elm)->field.cqe_prev->field.cqe_next = \ |
---|
557 | (elm)->field.cqe_next; \ |
---|
558 | } |
---|
559 | |
---|
560 | #ifdef KERNEL |
---|
561 | |
---|
562 | /* |
---|
563 | * XXX insque() and remque() are an old way of handling certain queues. |
---|
564 | * They bogusly assumes that all queue heads look alike. |
---|
565 | */ |
---|
566 | |
---|
567 | struct quehead { |
---|
568 | struct quehead *qh_link; |
---|
569 | struct quehead *qh_rlink; |
---|
570 | }; |
---|
571 | |
---|
572 | #ifdef __GNUC__ |
---|
573 | |
---|
574 | static __inline void |
---|
575 | insque(void *a, void *b) |
---|
576 | { |
---|
577 | struct quehead *element = (struct quehead *)a, |
---|
578 | *head = (struct quehead *)b; |
---|
579 | |
---|
580 | element->qh_link = head->qh_link; |
---|
581 | element->qh_rlink = head; |
---|
582 | head->qh_link = element; |
---|
583 | element->qh_link->qh_rlink = element; |
---|
584 | } |
---|
585 | |
---|
586 | static __inline void |
---|
587 | remque(void *a) |
---|
588 | { |
---|
589 | struct quehead *element = (struct quehead *)a; |
---|
590 | |
---|
591 | element->qh_link->qh_rlink = element->qh_rlink; |
---|
592 | element->qh_rlink->qh_link = element->qh_link; |
---|
593 | element->qh_rlink = 0; |
---|
594 | } |
---|
595 | |
---|
596 | #else /* !__GNUC__ */ |
---|
597 | |
---|
598 | void insque(void *a, void *b); |
---|
599 | void remque(void *a); |
---|
600 | |
---|
601 | #endif /* __GNUC__ */ |
---|
602 | |
---|
603 | #endif /* _KERNEL */ |
---|
604 | |
---|
605 | #endif /* !_SYS_QUEUE_H_ */ |
---|