Mercurial > hg > nginx-quic
annotate src/core/ngx_buf.c @ 4569:1db899642518
Upstream: reject upstreams without normal servers.
Such upstreams cause CPU hog later in the code as number of peers isn't
expected to be 0. Currently this may happen either if there are only backup
servers defined in an upstream block, or if server with ipv6 address used
in an upstream block.
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Mon, 02 Apr 2012 21:29:35 +0000 |
parents | d620f497c50f |
children | f9c83484d9ce |
rev | line source |
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441
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1 |
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2 /* |
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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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8 #include <ngx_config.h> |
100
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9 #include <ngx_core.h> |
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10 |
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11 |
499 | 12 ngx_buf_t * |
13 ngx_create_temp_buf(ngx_pool_t *pool, size_t size) | |
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14 { |
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15 ngx_buf_t *b; |
16
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16 |
501 | 17 b = ngx_calloc_buf(pool); |
18 if (b == NULL) { | |
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19 return NULL; |
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20 } |
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21 |
501 | 22 b->start = ngx_palloc(pool, size); |
23 if (b->start == NULL) { | |
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24 return NULL; |
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25 } |
166
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26 |
499 | 27 /* |
28 * set by ngx_calloc_buf(): | |
29 * | |
30 * b->file_pos = 0; | |
31 * b->file_last = 0; | |
32 * b->file = NULL; | |
33 * b->shadow = NULL; | |
34 * b->tag = 0; | |
509 | 35 * and flags |
499 | 36 */ |
37 | |
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38 b->pos = b->start; |
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39 b->last = b->start; |
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40 b->end = b->last + size; |
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41 b->temporary = 1; |
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42 |
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43 return b; |
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44 } |
93
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45 |
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46 |
499 | 47 ngx_chain_t * |
507 | 48 ngx_alloc_chain_link(ngx_pool_t *pool) |
49 { | |
50 ngx_chain_t *cl; | |
51 | |
52 cl = pool->chain; | |
53 | |
54 if (cl) { | |
55 pool->chain = cl->next; | |
56 return cl; | |
57 } | |
58 | |
59 cl = ngx_palloc(pool, sizeof(ngx_chain_t)); | |
60 if (cl == NULL) { | |
61 return NULL; | |
62 } | |
63 | |
64 return cl; | |
65 } | |
66 | |
67 | |
68 ngx_chain_t * | |
499 | 69 ngx_create_chain_of_bufs(ngx_pool_t *pool, ngx_bufs_t *bufs) |
160
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70 { |
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71 u_char *p; |
290
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72 ngx_int_t i; |
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73 ngx_buf_t *b; |
160
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74 ngx_chain_t *chain, *cl, **ll; |
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75 |
501 | 76 p = ngx_palloc(pool, bufs->num * bufs->size); |
77 if (p == NULL) { | |
343
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78 return NULL; |
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79 } |
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80 |
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81 ll = &chain; |
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82 |
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83 for (i = 0; i < bufs->num; i++) { |
501 | 84 |
85 b = ngx_calloc_buf(pool); | |
86 if (b == NULL) { | |
343
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87 return NULL; |
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88 } |
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89 |
499 | 90 /* |
91 * set by ngx_calloc_buf(): | |
92 * | |
93 * b->file_pos = 0; | |
94 * b->file_last = 0; | |
95 * b->file = NULL; | |
96 * b->shadow = NULL; | |
97 * b->tag = 0; | |
509 | 98 * and flags |
499 | 99 * |
100 */ | |
101 | |
343
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102 b->pos = p; |
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103 b->last = p; |
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104 b->temporary = 1; |
160
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105 |
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106 b->start = p; |
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107 p += bufs->size; |
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108 b->end = p; |
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109 |
501 | 110 cl = ngx_alloc_chain_link(pool); |
111 if (cl == NULL) { | |
343
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112 return NULL; |
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113 } |
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114 |
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115 cl->buf = b; |
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116 *ll = cl; |
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117 ll = &cl->next; |
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118 } |
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119 |
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120 *ll = NULL; |
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121 |
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122 return chain; |
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123 } |
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124 |
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125 |
499 | 126 ngx_int_t |
127 ngx_chain_add_copy(ngx_pool_t *pool, ngx_chain_t **chain, ngx_chain_t *in) | |
134
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128 { |
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129 ngx_chain_t *cl, **ll; |
134
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130 |
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131 ll = chain; |
134
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132 |
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133 for (cl = *chain; cl; cl = cl->next) { |
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134 ll = &cl->next; |
134
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135 } |
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136 |
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137 while (in) { |
501 | 138 cl = ngx_alloc_chain_link(pool); |
139 if (cl == NULL) { | |
140 return NGX_ERROR; | |
141 } | |
134
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142 |
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143 cl->buf = in->buf; |
155
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144 *ll = cl; |
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145 ll = &cl->next; |
134
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146 in = in->next; |
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147 } |
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148 |
155
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149 *ll = NULL; |
136
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150 |
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151 return NGX_OK; |
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152 } |
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153 |
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154 |
581 | 155 ngx_chain_t * |
156 ngx_chain_get_free_buf(ngx_pool_t *p, ngx_chain_t **free) | |
157 { | |
158 ngx_chain_t *cl; | |
159 | |
160 if (*free) { | |
161 cl = *free; | |
162 *free = cl->next; | |
163 cl->next = NULL; | |
164 return cl; | |
165 } | |
166 | |
167 cl = ngx_alloc_chain_link(p); | |
168 if (cl == NULL) { | |
169 return NULL; | |
170 } | |
171 | |
172 cl->buf = ngx_calloc_buf(p); | |
173 if (cl->buf == NULL) { | |
174 return NULL; | |
175 } | |
176 | |
177 cl->next = NULL; | |
178 | |
179 return cl; | |
180 } | |
181 | |
182 | |
499 | 183 void |
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184 ngx_chain_update_chains(ngx_pool_t *p, ngx_chain_t **free, ngx_chain_t **busy, |
499 | 185 ngx_chain_t **out, ngx_buf_tag_t tag) |
132
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186 { |
499 | 187 ngx_chain_t *cl; |
132
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188 |
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189 if (*busy == NULL) { |
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190 *busy = *out; |
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191 |
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192 } else { |
499 | 193 for (cl = *busy; cl->next; cl = cl->next) { /* void */ } |
455 | 194 |
499 | 195 cl->next = *out; |
132
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196 } |
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197 |
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198 *out = NULL; |
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199 |
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200 while (*busy) { |
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201 cl = *busy; |
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202 |
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203 if (ngx_buf_size(cl->buf) != 0) { |
132
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204 break; |
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205 } |
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206 |
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207 if (cl->buf->tag != tag) { |
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208 *busy = cl->next; |
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209 ngx_free_chain(p, cl); |
135
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210 continue; |
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211 } |
132
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212 |
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213 cl->buf->pos = cl->buf->start; |
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214 cl->buf->last = cl->buf->start; |
132
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215 |
499 | 216 *busy = cl->next; |
217 cl->next = *free; | |
218 *free = cl; | |
132
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219 } |
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220 } |