Mercurial > hg > nginx
annotate src/core/ngx_radix_tree.c @ 993:1b9a4d92173f
pass the inherited shm_zone data
author | Igor Sysoev <igor@sysoev.ru> |
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date | Tue, 09 Jan 2007 15:59:20 +0000 |
parents | 9c2f3ed7a247 |
children | 119605405c4b |
rev | line source |
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441
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nginx-0.1.0-2004-09-28-12:34:51 import; set copyright and remove unused files
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1 |
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2 /* |
444
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3 * Copyright (C) Igor Sysoev |
441
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4 */ |
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5 |
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6 |
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7 #include <ngx_config.h> |
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8 #include <ngx_core.h> |
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9 |
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10 |
485 | 11 static void *ngx_radix_alloc(ngx_radix_tree_t *tree); |
340
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12 |
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13 |
487 | 14 ngx_radix_tree_t * |
489 | 15 ngx_radix_tree_create(ngx_pool_t *pool, ngx_int_t preallocate) |
340
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16 { |
487 | 17 uint32_t key, mask, inc; |
340
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18 ngx_radix_tree_t *tree; |
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19 |
501 | 20 tree = ngx_palloc(pool, sizeof(ngx_radix_tree_t)); |
21 if (tree == NULL) { | |
340
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22 return NULL; |
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23 } |
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24 |
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25 tree->pool = pool; |
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26 tree->free = NULL; |
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27 tree->start = NULL; |
340
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28 tree->size = 0; |
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29 |
501 | 30 tree->root = ngx_radix_alloc(tree); |
31 if (tree->root == NULL) { | |
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32 return NULL; |
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33 } |
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34 |
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35 tree->root->right = NULL; |
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36 tree->root->left = NULL; |
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37 tree->root->parent = NULL; |
485 | 38 tree->root->value = NGX_RADIX_NO_VALUE; |
342
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39 |
489 | 40 if (preallocate == 0) { |
41 return tree; | |
42 } | |
43 | |
487 | 44 /* |
493 | 45 * The preallocation the first nodes: 0, 1, 00, 01, 10, 11, 000, 001, etc. |
46 * increases the TLB hits even if for the first lookup iterations. | |
487 | 47 * On the 32-bit platforms the 7 preallocated bits takes continuous 4K, |
489 | 48 * 8 - 8K, 9 - 16K, etc. On the 64-bit platforms the 6 preallocated bits |
49 * takes continuous 4K, 7 - 8K, 8 - 16K, etc. There is no sense to | |
50 * to preallocate more than one page, because further preallocation | |
499 | 51 * distributes the only bit per page. Instead, the random insertion |
489 | 52 * may distribute several bits per page. |
53 * | |
54 * Thus, by default we preallocate maximum | |
55 * 6 bits on amd64 (64-bit platform and 4K pages) | |
56 * 7 bits on i386 (32-bit platform and 4K pages) | |
57 * 7 bits on sparc64 in 64-bit mode (8K pages) | |
58 * 8 bits on sparc64 in 32-bit mode (8K pages) | |
487 | 59 */ |
60 | |
489 | 61 if (preallocate == -1) { |
62 switch (ngx_pagesize / sizeof(ngx_radix_tree_t)) { | |
63 | |
64 /* amd64 */ | |
65 case 128: | |
66 preallocate = 6; | |
67 break; | |
68 | |
69 /* i386, sparc64 */ | |
70 case 256: | |
71 preallocate = 7; | |
72 break; | |
73 | |
74 /* sparc64 in 32-bit mode */ | |
75 default: | |
76 preallocate = 8; | |
77 } | |
78 } | |
79 | |
487 | 80 mask = 0; |
81 inc = 0x80000000; | |
82 | |
83 while (preallocate--) { | |
84 | |
85 key = 0; | |
86 mask >>= 1; | |
87 mask |= 0x80000000; | |
88 | |
89 do { | |
90 if (ngx_radix32tree_insert(tree, key, mask, NGX_RADIX_NO_VALUE) | |
91 != NGX_OK) | |
92 { | |
93 return NULL; | |
94 } | |
95 | |
96 key += inc; | |
97 | |
98 } while (key); | |
99 | |
100 inc >>= 1; | |
101 } | |
102 | |
340
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103 return tree; |
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104 } |
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105 |
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106 |
487 | 107 ngx_int_t |
108 ngx_radix32tree_insert(ngx_radix_tree_t *tree, uint32_t key, uint32_t mask, | |
109 uintptr_t value) | |
340
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110 { |
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111 uint32_t bit; |
342
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112 ngx_radix_node_t *node, *next; |
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113 |
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114 bit = 0x80000000; |
485 | 115 |
342
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116 node = tree->root; |
485 | 117 next = tree->root; |
342
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118 |
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119 while (bit & mask) { |
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120 if (key & bit) { |
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121 next = node->right; |
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122 |
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123 } else { |
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124 next = node->left; |
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125 } |
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126 |
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127 if (next == NULL) { |
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128 break; |
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129 } |
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130 |
485 | 131 bit >>= 1; |
342
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132 node = next; |
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133 } |
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134 |
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135 if (next) { |
485 | 136 if (node->value != NGX_RADIX_NO_VALUE) { |
342
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137 return NGX_BUSY; |
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138 } |
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139 |
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140 node->value = value; |
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141 return NGX_OK; |
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142 } |
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143 |
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144 while (bit & mask) { |
501 | 145 next = ngx_radix_alloc(tree); |
146 if (next == NULL) { | |
342
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147 return NGX_ERROR; |
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148 } |
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149 |
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150 next->right = NULL; |
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151 next->left = NULL; |
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152 next->parent = node; |
485 | 153 next->value = NGX_RADIX_NO_VALUE; |
342
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154 |
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155 if (key & bit) { |
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156 node->right = next; |
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157 |
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158 } else { |
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159 node->left = next; |
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160 } |
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161 |
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162 bit >>= 1; |
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163 node = next; |
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164 } |
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165 |
485 | 166 node->value = value; |
167 | |
342
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168 return NGX_OK; |
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169 } |
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170 |
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171 |
487 | 172 ngx_int_t |
173 ngx_radix32tree_delete(ngx_radix_tree_t *tree, uint32_t key, uint32_t mask) | |
342
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174 { |
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175 uint32_t bit; |
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176 ngx_radix_node_t *node; |
340
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177 |
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178 bit = 0x80000000; |
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179 node = tree->root; |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
180 |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
181 while (node && (bit & mask)) { |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
182 if (key & bit) { |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
183 node = node->right; |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
184 |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
185 } else { |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
186 node = node->left; |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
187 } |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
188 |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
189 bit >>= 1; |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
190 } |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
191 |
342
0ee0642af5f1
nginx-0.0.3-2004-05-26-23:33:53 import
Igor Sysoev <igor@sysoev.ru>
parents:
341
diff
changeset
|
192 if (node == NULL) { |
0ee0642af5f1
nginx-0.0.3-2004-05-26-23:33:53 import
Igor Sysoev <igor@sysoev.ru>
parents:
341
diff
changeset
|
193 return NGX_ERROR; |
0ee0642af5f1
nginx-0.0.3-2004-05-26-23:33:53 import
Igor Sysoev <igor@sysoev.ru>
parents:
341
diff
changeset
|
194 } |
340
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
195 |
342
0ee0642af5f1
nginx-0.0.3-2004-05-26-23:33:53 import
Igor Sysoev <igor@sysoev.ru>
parents:
341
diff
changeset
|
196 if (node->right || node->left) { |
485 | 197 if (node->value != NGX_RADIX_NO_VALUE) { |
198 node->value = NGX_RADIX_NO_VALUE; | |
199 return NGX_OK; | |
200 } | |
201 | |
202 return NGX_ERROR; | |
340
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
203 } |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
204 |
342
0ee0642af5f1
nginx-0.0.3-2004-05-26-23:33:53 import
Igor Sysoev <igor@sysoev.ru>
parents:
341
diff
changeset
|
205 for ( ;; ) { |
0ee0642af5f1
nginx-0.0.3-2004-05-26-23:33:53 import
Igor Sysoev <igor@sysoev.ru>
parents:
341
diff
changeset
|
206 if (node->parent->right == node) { |
0ee0642af5f1
nginx-0.0.3-2004-05-26-23:33:53 import
Igor Sysoev <igor@sysoev.ru>
parents:
341
diff
changeset
|
207 node->parent->right = NULL; |
563 | 208 |
342
0ee0642af5f1
nginx-0.0.3-2004-05-26-23:33:53 import
Igor Sysoev <igor@sysoev.ru>
parents:
341
diff
changeset
|
209 } else { |
0ee0642af5f1
nginx-0.0.3-2004-05-26-23:33:53 import
Igor Sysoev <igor@sysoev.ru>
parents:
341
diff
changeset
|
210 node->parent->left = NULL; |
340
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
211 } |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
212 |
342
0ee0642af5f1
nginx-0.0.3-2004-05-26-23:33:53 import
Igor Sysoev <igor@sysoev.ru>
parents:
341
diff
changeset
|
213 node->right = tree->free; |
0ee0642af5f1
nginx-0.0.3-2004-05-26-23:33:53 import
Igor Sysoev <igor@sysoev.ru>
parents:
341
diff
changeset
|
214 tree->free = node; |
340
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
215 |
342
0ee0642af5f1
nginx-0.0.3-2004-05-26-23:33:53 import
Igor Sysoev <igor@sysoev.ru>
parents:
341
diff
changeset
|
216 node = node->parent; |
0ee0642af5f1
nginx-0.0.3-2004-05-26-23:33:53 import
Igor Sysoev <igor@sysoev.ru>
parents:
341
diff
changeset
|
217 |
563 | 218 if (node->right || node->left) { |
219 break; | |
220 } | |
221 | |
222 if (node->value != NGX_RADIX_NO_VALUE) { | |
223 break; | |
224 } | |
225 | |
226 if (node->parent == NULL) { | |
342
0ee0642af5f1
nginx-0.0.3-2004-05-26-23:33:53 import
Igor Sysoev <igor@sysoev.ru>
parents:
341
diff
changeset
|
227 break; |
340
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
228 } |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
229 } |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
230 |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
231 return NGX_OK; |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
232 } |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
233 |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
234 |
487 | 235 uintptr_t |
236 ngx_radix32tree_find(ngx_radix_tree_t *tree, uint32_t key) | |
340
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
237 { |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
238 uint32_t bit; |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
239 uintptr_t value; |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
240 ngx_radix_node_t *node; |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
241 |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
242 bit = 0x80000000; |
485 | 243 value = NGX_RADIX_NO_VALUE; |
340
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
244 node = tree->root; |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
245 |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
246 while (node) { |
485 | 247 if (node->value != NGX_RADIX_NO_VALUE) { |
340
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
248 value = node->value; |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
249 } |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
250 |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
251 if (key & bit) { |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
252 node = node->right; |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
253 |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
254 } else { |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
255 node = node->left; |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
256 } |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
257 |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
258 bit >>= 1; |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
259 } |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
260 |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
261 return value; |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
262 } |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
263 |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
264 |
487 | 265 static void * |
266 ngx_radix_alloc(ngx_radix_tree_t *tree) | |
340
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
267 { |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
268 char *p; |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
269 |
341
41e552841296
nginx-0.0.3-2004-05-26-19:30:12 import
Igor Sysoev <igor@sysoev.ru>
parents:
340
diff
changeset
|
270 if (tree->free) { |
41e552841296
nginx-0.0.3-2004-05-26-19:30:12 import
Igor Sysoev <igor@sysoev.ru>
parents:
340
diff
changeset
|
271 p = (char *) tree->free; |
41e552841296
nginx-0.0.3-2004-05-26-19:30:12 import
Igor Sysoev <igor@sysoev.ru>
parents:
340
diff
changeset
|
272 tree->free = tree->free->right; |
41e552841296
nginx-0.0.3-2004-05-26-19:30:12 import
Igor Sysoev <igor@sysoev.ru>
parents:
340
diff
changeset
|
273 return p; |
41e552841296
nginx-0.0.3-2004-05-26-19:30:12 import
Igor Sysoev <igor@sysoev.ru>
parents:
340
diff
changeset
|
274 } |
41e552841296
nginx-0.0.3-2004-05-26-19:30:12 import
Igor Sysoev <igor@sysoev.ru>
parents:
340
diff
changeset
|
275 |
485 | 276 if (tree->size < sizeof(ngx_radix_node_t)) { |
501 | 277 tree->start = ngx_palloc(tree->pool, ngx_pagesize); |
278 if (tree->start == NULL) { | |
340
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
279 return NULL; |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
280 } |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
281 |
351
af4c6b45a687
nginx-0.0.4-2004-06-10-22:36:57 import
Igor Sysoev <igor@sysoev.ru>
parents:
342
diff
changeset
|
282 tree->size = ngx_pagesize; |
340
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
283 } |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
284 |
341
41e552841296
nginx-0.0.3-2004-05-26-19:30:12 import
Igor Sysoev <igor@sysoev.ru>
parents:
340
diff
changeset
|
285 p = tree->start; |
485 | 286 tree->start += sizeof(ngx_radix_node_t); |
287 tree->size -= sizeof(ngx_radix_node_t); | |
340
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
288 |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
289 return p; |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
290 } |