Mercurial > hg > nginx
annotate src/core/ngx_buf.c @ 3513:e60e00b4fe0c
ngx_http_split_clients_module
author | Igor Sysoev <igor@sysoev.ru> |
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date | Fri, 14 May 2010 09:02:10 +0000 |
parents | cc13ff6d5c07 |
children | 5db098f97e0e 4919fb357a5d |
rev | line source |
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1 |
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2 /* |
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3 * Copyright (C) Igor Sysoev |
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4 */ |
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7 #include <ngx_config.h> |
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8 #include <ngx_core.h> |
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10 |
499 | 11 ngx_buf_t * |
12 ngx_create_temp_buf(ngx_pool_t *pool, size_t size) | |
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13 { |
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14 ngx_buf_t *b; |
16
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15 |
501 | 16 b = ngx_calloc_buf(pool); |
17 if (b == NULL) { | |
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18 return NULL; |
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19 } |
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20 |
501 | 21 b->start = ngx_palloc(pool, size); |
22 if (b->start == NULL) { | |
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23 return NULL; |
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24 } |
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25 |
499 | 26 /* |
27 * set by ngx_calloc_buf(): | |
28 * | |
29 * b->file_pos = 0; | |
30 * b->file_last = 0; | |
31 * b->file = NULL; | |
32 * b->shadow = NULL; | |
33 * b->tag = 0; | |
509 | 34 * and flags |
499 | 35 */ |
36 | |
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37 b->pos = b->start; |
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38 b->last = b->start; |
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39 b->end = b->last + size; |
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40 b->temporary = 1; |
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41 |
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42 return b; |
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43 } |
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44 |
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45 |
499 | 46 ngx_chain_t * |
507 | 47 ngx_alloc_chain_link(ngx_pool_t *pool) |
48 { | |
49 ngx_chain_t *cl; | |
50 | |
51 cl = pool->chain; | |
52 | |
53 if (cl) { | |
54 pool->chain = cl->next; | |
55 return cl; | |
56 } | |
57 | |
58 cl = ngx_palloc(pool, sizeof(ngx_chain_t)); | |
59 if (cl == NULL) { | |
60 return NULL; | |
61 } | |
62 | |
63 return cl; | |
64 } | |
65 | |
66 | |
67 ngx_chain_t * | |
499 | 68 ngx_create_chain_of_bufs(ngx_pool_t *pool, ngx_bufs_t *bufs) |
160
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69 { |
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70 u_char *p; |
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71 ngx_int_t i; |
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72 ngx_buf_t *b; |
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73 ngx_chain_t *chain, *cl, **ll; |
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74 |
501 | 75 p = ngx_palloc(pool, bufs->num * bufs->size); |
76 if (p == NULL) { | |
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77 return NULL; |
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78 } |
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79 |
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80 ll = &chain; |
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81 |
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82 for (i = 0; i < bufs->num; i++) { |
501 | 83 |
84 b = ngx_calloc_buf(pool); | |
85 if (b == NULL) { | |
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86 return NULL; |
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87 } |
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88 |
499 | 89 /* |
90 * set by ngx_calloc_buf(): | |
91 * | |
92 * b->file_pos = 0; | |
93 * b->file_last = 0; | |
94 * b->file = NULL; | |
95 * b->shadow = NULL; | |
96 * b->tag = 0; | |
509 | 97 * and flags |
499 | 98 * |
99 */ | |
100 | |
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101 b->pos = p; |
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102 b->last = p; |
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103 b->temporary = 1; |
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104 |
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105 b->start = p; |
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106 p += bufs->size; |
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107 b->end = p; |
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108 |
501 | 109 cl = ngx_alloc_chain_link(pool); |
110 if (cl == NULL) { | |
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111 return NULL; |
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112 } |
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113 |
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114 cl->buf = b; |
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115 *ll = cl; |
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116 ll = &cl->next; |
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117 } |
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118 |
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119 *ll = NULL; |
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120 |
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121 return chain; |
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122 } |
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123 |
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124 |
499 | 125 ngx_int_t |
126 ngx_chain_add_copy(ngx_pool_t *pool, ngx_chain_t **chain, ngx_chain_t *in) | |
134
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127 { |
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128 ngx_chain_t *cl, **ll; |
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129 |
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130 ll = chain; |
134
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131 |
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132 for (cl = *chain; cl; cl = cl->next) { |
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133 ll = &cl->next; |
134
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134 } |
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135 |
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136 while (in) { |
501 | 137 cl = ngx_alloc_chain_link(pool); |
138 if (cl == NULL) { | |
139 return NGX_ERROR; | |
140 } | |
134
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141 |
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142 cl->buf = in->buf; |
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143 *ll = cl; |
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144 ll = &cl->next; |
134
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145 in = in->next; |
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146 } |
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147 |
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148 *ll = NULL; |
136
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149 |
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150 return NGX_OK; |
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151 } |
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152 |
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153 |
581 | 154 ngx_chain_t * |
155 ngx_chain_get_free_buf(ngx_pool_t *p, ngx_chain_t **free) | |
156 { | |
157 ngx_chain_t *cl; | |
158 | |
159 if (*free) { | |
160 cl = *free; | |
161 *free = cl->next; | |
162 cl->next = NULL; | |
163 return cl; | |
164 } | |
165 | |
166 cl = ngx_alloc_chain_link(p); | |
167 if (cl == NULL) { | |
168 return NULL; | |
169 } | |
170 | |
171 cl->buf = ngx_calloc_buf(p); | |
172 if (cl->buf == NULL) { | |
173 return NULL; | |
174 } | |
175 | |
176 cl->next = NULL; | |
177 | |
178 return cl; | |
179 } | |
180 | |
181 | |
499 | 182 void |
183 ngx_chain_update_chains(ngx_chain_t **free, ngx_chain_t **busy, | |
184 ngx_chain_t **out, ngx_buf_tag_t tag) | |
132
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185 { |
499 | 186 ngx_chain_t *cl; |
132
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187 |
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188 if (*busy == NULL) { |
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189 *busy = *out; |
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190 |
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191 } else { |
499 | 192 for (cl = *busy; cl->next; cl = cl->next) { /* void */ } |
455 | 193 |
499 | 194 cl->next = *out; |
132
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195 } |
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196 |
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197 *out = NULL; |
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198 |
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199 while (*busy) { |
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200 if (ngx_buf_size((*busy)->buf) != 0) { |
132
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201 break; |
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202 } |
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203 |
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204 if ((*busy)->buf->tag != tag) { |
135
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205 *busy = (*busy)->next; |
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206 continue; |
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207 } |
132
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208 |
452 | 209 (*busy)->buf->pos = (*busy)->buf->start; |
210 (*busy)->buf->last = (*busy)->buf->start; | |
132
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211 |
499 | 212 cl = *busy; |
213 *busy = cl->next; | |
214 cl->next = *free; | |
215 *free = cl; | |
132
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216 } |
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217 } |