Mercurial > hg > nginx-quic
annotate src/core/ngx_radix_tree.c @ 4606:f582d662cc40 release-1.2.0
nginx-1.2.0-RELEASE
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Mon, 23 Apr 2012 13:06:47 +0000 |
parents | d620f497c50f |
children | efa334556803 |
rev | line source |
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441
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1 |
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2 /* |
444
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3 * Copyright (C) Igor Sysoev |
4412 | 4 * Copyright (C) Nginx, Inc. |
441
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5 */ |
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6 |
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7 |
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8 #include <ngx_config.h> |
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9 #include <ngx_core.h> |
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10 |
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11 |
485 | 12 static void *ngx_radix_alloc(ngx_radix_tree_t *tree); |
340
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13 |
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14 |
487 | 15 ngx_radix_tree_t * |
489 | 16 ngx_radix_tree_create(ngx_pool_t *pool, ngx_int_t preallocate) |
340
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17 { |
487 | 18 uint32_t key, mask, inc; |
340
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19 ngx_radix_tree_t *tree; |
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20 |
501 | 21 tree = ngx_palloc(pool, sizeof(ngx_radix_tree_t)); |
22 if (tree == NULL) { | |
340
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23 return NULL; |
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24 } |
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25 |
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26 tree->pool = pool; |
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27 tree->free = NULL; |
341
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28 tree->start = NULL; |
340
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29 tree->size = 0; |
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30 |
501 | 31 tree->root = ngx_radix_alloc(tree); |
32 if (tree->root == NULL) { | |
342
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33 return NULL; |
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34 } |
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35 |
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36 tree->root->right = NULL; |
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37 tree->root->left = NULL; |
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38 tree->root->parent = NULL; |
485 | 39 tree->root->value = NGX_RADIX_NO_VALUE; |
342
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40 |
489 | 41 if (preallocate == 0) { |
42 return tree; | |
43 } | |
44 | |
487 | 45 /* |
2366 | 46 * Preallocation of first nodes : 0, 1, 00, 01, 10, 11, 000, 001, etc. |
47 * increases TLB hits even if for first lookup iterations. | |
48 * On 32-bit platforms the 7 preallocated bits takes continuous 4K, | |
49 * 8 - 8K, 9 - 16K, etc. On 64-bit platforms the 6 preallocated bits | |
489 | 50 * takes continuous 4K, 7 - 8K, 8 - 16K, etc. There is no sense to |
51 * to preallocate more than one page, because further preallocation | |
2366 | 52 * distributes the only bit per page. Instead, a random insertion |
489 | 53 * may distribute several bits per page. |
54 * | |
55 * Thus, by default we preallocate maximum | |
56 * 6 bits on amd64 (64-bit platform and 4K pages) | |
57 * 7 bits on i386 (32-bit platform and 4K pages) | |
58 * 7 bits on sparc64 in 64-bit mode (8K pages) | |
59 * 8 bits on sparc64 in 32-bit mode (8K pages) | |
487 | 60 */ |
61 | |
489 | 62 if (preallocate == -1) { |
63 switch (ngx_pagesize / sizeof(ngx_radix_tree_t)) { | |
64 | |
65 /* amd64 */ | |
66 case 128: | |
67 preallocate = 6; | |
68 break; | |
69 | |
70 /* i386, sparc64 */ | |
71 case 256: | |
72 preallocate = 7; | |
73 break; | |
74 | |
75 /* sparc64 in 32-bit mode */ | |
76 default: | |
77 preallocate = 8; | |
78 } | |
79 } | |
80 | |
487 | 81 mask = 0; |
82 inc = 0x80000000; | |
83 | |
84 while (preallocate--) { | |
85 | |
86 key = 0; | |
87 mask >>= 1; | |
88 mask |= 0x80000000; | |
89 | |
90 do { | |
91 if (ngx_radix32tree_insert(tree, key, mask, NGX_RADIX_NO_VALUE) | |
1130 | 92 != NGX_OK) |
487 | 93 { |
94 return NULL; | |
95 } | |
96 | |
97 key += inc; | |
98 | |
99 } while (key); | |
100 | |
101 inc >>= 1; | |
102 } | |
103 | |
340
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104 return tree; |
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105 } |
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106 |
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107 |
487 | 108 ngx_int_t |
109 ngx_radix32tree_insert(ngx_radix_tree_t *tree, uint32_t key, uint32_t mask, | |
110 uintptr_t value) | |
340
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111 { |
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112 uint32_t bit; |
342
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113 ngx_radix_node_t *node, *next; |
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114 |
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115 bit = 0x80000000; |
485 | 116 |
342
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117 node = tree->root; |
485 | 118 next = tree->root; |
342
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119 |
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120 while (bit & mask) { |
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121 if (key & bit) { |
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122 next = node->right; |
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123 |
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124 } else { |
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125 next = node->left; |
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126 } |
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127 |
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128 if (next == NULL) { |
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129 break; |
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130 } |
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131 |
485 | 132 bit >>= 1; |
342
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133 node = next; |
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134 } |
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135 |
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136 if (next) { |
485 | 137 if (node->value != NGX_RADIX_NO_VALUE) { |
342
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138 return NGX_BUSY; |
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139 } |
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140 |
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141 node->value = value; |
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142 return NGX_OK; |
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143 } |
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144 |
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145 while (bit & mask) { |
501 | 146 next = ngx_radix_alloc(tree); |
147 if (next == NULL) { | |
342
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148 return NGX_ERROR; |
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149 } |
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150 |
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151 next->right = NULL; |
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152 next->left = NULL; |
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153 next->parent = node; |
485 | 154 next->value = NGX_RADIX_NO_VALUE; |
342
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155 |
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156 if (key & bit) { |
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157 node->right = next; |
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158 |
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159 } else { |
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160 node->left = next; |
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161 } |
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162 |
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163 bit >>= 1; |
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164 node = next; |
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165 } |
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166 |
485 | 167 node->value = value; |
168 | |
342
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169 return NGX_OK; |
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170 } |
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171 |
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172 |
487 | 173 ngx_int_t |
174 ngx_radix32tree_delete(ngx_radix_tree_t *tree, uint32_t key, uint32_t mask) | |
342
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175 { |
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176 uint32_t bit; |
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177 ngx_radix_node_t *node; |
340
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178 |
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179 bit = 0x80000000; |
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180 node = tree->root; |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
181 |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
182 while (node && (bit & mask)) { |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
183 if (key & bit) { |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
184 node = node->right; |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
185 |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
186 } else { |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
187 node = node->left; |
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 |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
190 bit >>= 1; |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
191 } |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
192 |
342
0ee0642af5f1
nginx-0.0.3-2004-05-26-23:33:53 import
Igor Sysoev <igor@sysoev.ru>
parents:
341
diff
changeset
|
193 if (node == NULL) { |
0ee0642af5f1
nginx-0.0.3-2004-05-26-23:33:53 import
Igor Sysoev <igor@sysoev.ru>
parents:
341
diff
changeset
|
194 return NGX_ERROR; |
0ee0642af5f1
nginx-0.0.3-2004-05-26-23:33:53 import
Igor Sysoev <igor@sysoev.ru>
parents:
341
diff
changeset
|
195 } |
340
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
196 |
342
0ee0642af5f1
nginx-0.0.3-2004-05-26-23:33:53 import
Igor Sysoev <igor@sysoev.ru>
parents:
341
diff
changeset
|
197 if (node->right || node->left) { |
485 | 198 if (node->value != NGX_RADIX_NO_VALUE) { |
199 node->value = NGX_RADIX_NO_VALUE; | |
200 return NGX_OK; | |
201 } | |
202 | |
203 return NGX_ERROR; | |
340
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
204 } |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
205 |
342
0ee0642af5f1
nginx-0.0.3-2004-05-26-23:33:53 import
Igor Sysoev <igor@sysoev.ru>
parents:
341
diff
changeset
|
206 for ( ;; ) { |
0ee0642af5f1
nginx-0.0.3-2004-05-26-23:33:53 import
Igor Sysoev <igor@sysoev.ru>
parents:
341
diff
changeset
|
207 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
|
208 node->parent->right = NULL; |
563 | 209 |
342
0ee0642af5f1
nginx-0.0.3-2004-05-26-23:33:53 import
Igor Sysoev <igor@sysoev.ru>
parents:
341
diff
changeset
|
210 } else { |
0ee0642af5f1
nginx-0.0.3-2004-05-26-23:33:53 import
Igor Sysoev <igor@sysoev.ru>
parents:
341
diff
changeset
|
211 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
|
212 } |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
213 |
342
0ee0642af5f1
nginx-0.0.3-2004-05-26-23:33:53 import
Igor Sysoev <igor@sysoev.ru>
parents:
341
diff
changeset
|
214 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
|
215 tree->free = node; |
340
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
216 |
342
0ee0642af5f1
nginx-0.0.3-2004-05-26-23:33:53 import
Igor Sysoev <igor@sysoev.ru>
parents:
341
diff
changeset
|
217 node = node->parent; |
0ee0642af5f1
nginx-0.0.3-2004-05-26-23:33:53 import
Igor Sysoev <igor@sysoev.ru>
parents:
341
diff
changeset
|
218 |
563 | 219 if (node->right || node->left) { |
220 break; | |
221 } | |
222 | |
223 if (node->value != NGX_RADIX_NO_VALUE) { | |
224 break; | |
225 } | |
226 | |
227 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
|
228 break; |
340
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 |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
232 return NGX_OK; |
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 |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
235 |
487 | 236 uintptr_t |
237 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
|
238 { |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
239 uint32_t bit; |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
240 uintptr_t value; |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
241 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
|
242 |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
243 bit = 0x80000000; |
485 | 244 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
|
245 node = tree->root; |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
246 |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
247 while (node) { |
485 | 248 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
|
249 value = node->value; |
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 |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
252 if (key & bit) { |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
253 node = node->right; |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
254 |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
255 } else { |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
256 node = node->left; |
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 |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
259 bit >>= 1; |
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 |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
262 return value; |
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 |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
265 |
487 | 266 static void * |
267 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
|
268 { |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
269 char *p; |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
270 |
341
41e552841296
nginx-0.0.3-2004-05-26-19:30:12 import
Igor Sysoev <igor@sysoev.ru>
parents:
340
diff
changeset
|
271 if (tree->free) { |
41e552841296
nginx-0.0.3-2004-05-26-19:30:12 import
Igor Sysoev <igor@sysoev.ru>
parents:
340
diff
changeset
|
272 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
|
273 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
|
274 return p; |
41e552841296
nginx-0.0.3-2004-05-26-19:30:12 import
Igor Sysoev <igor@sysoev.ru>
parents:
340
diff
changeset
|
275 } |
41e552841296
nginx-0.0.3-2004-05-26-19:30:12 import
Igor Sysoev <igor@sysoev.ru>
parents:
340
diff
changeset
|
276 |
485 | 277 if (tree->size < sizeof(ngx_radix_node_t)) { |
2221
78415b0469bc
use ngx_pmemalign() to allocate radix pages
Igor Sysoev <igor@sysoev.ru>
parents:
1130
diff
changeset
|
278 tree->start = ngx_pmemalign(tree->pool, ngx_pagesize, ngx_pagesize); |
501 | 279 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
|
280 return NULL; |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
281 } |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
282 |
351
af4c6b45a687
nginx-0.0.4-2004-06-10-22:36:57 import
Igor Sysoev <igor@sysoev.ru>
parents:
342
diff
changeset
|
283 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
|
284 } |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
285 |
341
41e552841296
nginx-0.0.3-2004-05-26-19:30:12 import
Igor Sysoev <igor@sysoev.ru>
parents:
340
diff
changeset
|
286 p = tree->start; |
485 | 287 tree->start += sizeof(ngx_radix_node_t); |
288 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
|
289 |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
290 return p; |
0bf903191ceb
nginx-0.0.3-2004-05-25-19:28:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
291 } |