Mercurial > hg > nginx
annotate src/core/ngx_buf.c @ 5790:af00bfa9b701 stable-1.6
Version bump.
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Tue, 05 Aug 2014 12:20:22 +0400 |
parents | d620f497c50f |
children | f9c83484d9ce |
rev | line source |
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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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8 #include <ngx_config.h> |
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9 #include <ngx_core.h> |
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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 } |
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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 } |
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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; |
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72 ngx_int_t i; |
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73 ngx_buf_t *b; |
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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) { | |
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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) { | |
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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 | |
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102 b->pos = p; |
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103 b->last = p; |
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104 b->temporary = 1; |
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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; |
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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 |
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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 } |