1 | /* macros/chain.h |
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2 | * |
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3 | * This include file contains the bodies of the routines which are |
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4 | * associated with doubly linked chains and inlined. |
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5 | * |
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6 | * COPYRIGHT (c) 1989-1999. |
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7 | * On-Line Applications Research Corporation (OAR). |
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8 | * |
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9 | * The license and distribution terms for this file may be |
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10 | * found in the file LICENSE in this distribution or at |
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11 | * http://www.OARcorp.com/rtems/license.html. |
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12 | * |
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13 | * $Id$ |
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14 | */ |
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15 | |
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16 | #ifndef __MACROS_CHAIN_h |
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17 | #define __MACROS_CHAIN_h |
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18 | |
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19 | /*PAGE |
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20 | * |
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21 | * _Chain_Are_nodes_equal |
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22 | */ |
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23 | |
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24 | #define _Chain_Are_nodes_equal( _left, _right ) \ |
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25 | ( (_left) == (_right) ) |
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26 | |
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27 | /*PAGE |
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28 | * |
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29 | * _Chain_Is_null |
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30 | */ |
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31 | |
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32 | #define _Chain_Is_null( _the_chain ) \ |
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33 | ( (_the_chain) == NULL ) |
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34 | |
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35 | /*PAGE |
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36 | * |
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37 | * _Chain_Is_null_node |
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38 | */ |
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39 | |
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40 | #define _Chain_Is_null_node( _the_node ) \ |
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41 | ( (_the_node) == NULL ) |
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42 | |
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43 | /*PAGE |
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44 | * |
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45 | * _Chain_Head |
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46 | */ |
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47 | |
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48 | #define _Chain_Head( _the_chain ) \ |
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49 | ((Chain_Node *) (_the_chain)) |
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50 | |
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51 | /*PAGE |
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52 | * |
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53 | * _Chain_Tail |
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54 | */ |
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55 | |
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56 | #define _Chain_Tail( _the_chain ) \ |
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57 | ((Chain_Node *) &(_the_chain)->permanent_null) |
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58 | |
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59 | /*PAGE |
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60 | * |
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61 | * _Chain_Is_empty |
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62 | */ |
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63 | |
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64 | #define _Chain_Is_empty( _the_chain ) \ |
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65 | ( (_the_chain)->first == _Chain_Tail( (_the_chain) ) ) |
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66 | |
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67 | /*PAGE |
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68 | * |
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69 | * _Chain_Is_first |
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70 | */ |
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71 | |
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72 | #define _Chain_Is_first( _the_node ) \ |
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73 | ( (the_node)->previous == NULL ) |
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74 | |
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75 | /*PAGE |
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76 | * |
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77 | * _Chain_Is_last |
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78 | */ |
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79 | |
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80 | #define _Chain_Is_last( _the_node ) \ |
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81 | ( (_the_node)->next == NULL ) |
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82 | |
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83 | /*PAGE |
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84 | * |
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85 | * _Chain_Has_only_one_node |
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86 | */ |
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87 | |
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88 | #define _Chain_Has_only_one_node( _the_chain ) \ |
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89 | ( (_the_chain)->first == (_the_chain)->last ) |
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90 | |
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91 | /*PAGE |
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92 | * |
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93 | * _Chain_Is_head |
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94 | */ |
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95 | |
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96 | #define _Chain_Is_head( _the_chain, _the_node ) \ |
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97 | ( (_the_node) == _Chain_Head( (_the_chain) ) ) |
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98 | |
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99 | /*PAGE |
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100 | * |
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101 | * _Chain_Is_tail |
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102 | */ |
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103 | |
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104 | #define _Chain_Is_tail( _the_chain, _the_node ) \ |
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105 | ( (_the_node) == _Chain_Tail( (_the_chain) ) ) |
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106 | |
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107 | /*PAGE |
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108 | * |
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109 | * Chain_Initialize_empty |
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110 | */ |
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111 | |
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112 | #define _Chain_Initialize_empty( _the_chain ) \ |
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113 | { \ |
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114 | (_the_chain)->first = _Chain_Tail( (_the_chain) ); \ |
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115 | (_the_chain)->permanent_null = NULL; \ |
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116 | (_the_chain)->last = _Chain_Head( (_the_chain) ); \ |
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117 | } |
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118 | |
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119 | /*PAGE |
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120 | * |
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121 | * _Chain_Extract_unprotected |
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122 | */ |
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123 | |
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124 | #define _Chain_Extract_unprotected( _the_node ) \ |
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125 | { \ |
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126 | Chain_Node *_next; \ |
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127 | Chain_Node *_previous; \ |
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128 | \ |
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129 | _next = (_the_node)->next; \ |
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130 | _previous = (_the_node)->previous; \ |
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131 | _next->previous = _previous; \ |
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132 | _previous->next = _next; \ |
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133 | } |
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134 | |
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135 | /*PAGE |
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136 | * |
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137 | * _Chain_Get_unprotected |
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138 | */ |
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139 | |
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140 | /*PAGE |
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141 | * |
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142 | * Chain_Get_unprotected |
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143 | */ |
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144 | |
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145 | #define _Chain_Get_unprotected( _the_chain ) \ |
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146 | (( !_Chain_Is_empty( (_the_chain) ) ) \ |
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147 | ? _Chain_Get_first_unprotected( (_the_chain) ) \ |
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148 | : NULL) |
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149 | |
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150 | /*PAGE |
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151 | * |
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152 | * _Chain_Insert_unprotected |
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153 | */ |
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154 | |
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155 | #define _Chain_Insert_unprotected( _after_node, _the_node ) \ |
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156 | do { \ |
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157 | Chain_Node *_before_node; \ |
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158 | \ |
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159 | (_the_node)->previous = (_after_node); \ |
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160 | _before_node = (_after_node)->next; \ |
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161 | (_after_node)->next = (_the_node); \ |
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162 | (_the_node)->next = _before_node; \ |
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163 | _before_node->previous = (_the_node); \ |
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164 | } while (0) |
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165 | |
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166 | /*PAGE |
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167 | * |
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168 | * _Chain_Append_unprotected |
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169 | */ |
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170 | |
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171 | #define _Chain_Append_unprotected( _the_chain, _the_node ) \ |
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172 | { \ |
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173 | Chain_Node *_old_last_node; \ |
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174 | \ |
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175 | (_the_node)->next = _Chain_Tail( (_the_chain) ); \ |
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176 | _old_last_node = (_the_chain)->last; \ |
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177 | (_the_chain)->last = (_the_node); \ |
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178 | _old_last_node->next = (_the_node); \ |
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179 | (_the_node)->previous = _old_last_node; \ |
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180 | } |
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181 | |
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182 | /*PAGE |
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183 | * |
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184 | * _Chain_Prepend_unprotected |
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185 | */ |
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186 | |
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187 | #define _Chain_Prepend_unprotected( _the_chain, _the_node ) \ |
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188 | _Chain_Insert_unprotected( _Chain_Head( (_the_chain) ), (_the_node) ) |
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189 | |
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190 | /*PAGE |
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191 | * |
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192 | * _Chain_Prepend |
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193 | */ |
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194 | |
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195 | #define _Chain_Prepend( _the_chain, _the_node ) \ |
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196 | _Chain_Insert( _Chain_Head( (_the_chain) ), (_the_node) ) |
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197 | |
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198 | #endif |
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199 | /* end of include file */ |
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