Mercurial > hg > nginx-quic
annotate src/core/ngx_buf.c @ 6826:d0404c9a7675
Slab: simplified allocation from slots.
Removed code that would cause an endless loop, and removed condition
check that is always false. The first page in the slot list is
guaranteed to satisfy an allocation.
author | Ruslan Ermilov <ru@nginx.com> |
---|---|
date | Wed, 07 Dec 2016 22:25:37 +0300 |
parents | 40c2f3e06d23 |
children | 7cc2d3a96ea3 |
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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8 #include <ngx_config.h> |
100
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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 } |
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; |
343
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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 } |
160
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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 |
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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 (*out) { |
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190 if (*busy == NULL) { |
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191 *busy = *out; |
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192 |
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193 } else { |
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194 for (cl = *busy; cl->next; cl = cl->next) { /* void */ } |
455 | 195 |
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196 cl->next = *out; |
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197 } |
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198 |
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199 *out = NULL; |
132
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200 } |
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201 |
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202 while (*busy) { |
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203 cl = *busy; |
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204 |
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205 if (ngx_buf_size(cl->buf) != 0) { |
132
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206 break; |
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207 } |
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208 |
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209 if (cl->buf->tag != tag) { |
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210 *busy = cl->next; |
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211 ngx_free_chain(p, cl); |
135
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212 continue; |
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213 } |
132
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214 |
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215 cl->buf->pos = cl->buf->start; |
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216 cl->buf->last = cl->buf->start; |
132
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217 |
499 | 218 *busy = cl->next; |
219 cl->next = *free; | |
220 *free = cl; | |
132
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221 } |
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222 } |
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223 |
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224 |
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225 off_t |
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226 ngx_chain_coalesce_file(ngx_chain_t **in, off_t limit) |
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227 { |
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228 off_t total, size, aligned, fprev; |
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229 ngx_fd_t fd; |
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230 ngx_chain_t *cl; |
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231 |
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232 total = 0; |
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233 |
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234 cl = *in; |
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235 fd = cl->buf->file->fd; |
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236 |
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237 do { |
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238 size = cl->buf->file_last - cl->buf->file_pos; |
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239 |
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240 if (size > limit - total) { |
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241 size = limit - total; |
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242 |
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243 aligned = (cl->buf->file_pos + size + ngx_pagesize - 1) |
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244 & ~((off_t) ngx_pagesize - 1); |
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245 |
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246 if (aligned <= cl->buf->file_last) { |
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247 size = aligned - cl->buf->file_pos; |
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248 } |
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249 } |
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250 |
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251 total += size; |
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252 fprev = cl->buf->file_pos + size; |
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253 cl = cl->next; |
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254 |
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255 } while (cl |
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256 && cl->buf->in_file |
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257 && total < limit |
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258 && fd == cl->buf->file->fd |
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259 && fprev == cl->buf->file_pos); |
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260 |
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261 *in = cl; |
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262 |
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263 return total; |
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264 } |
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265 |
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266 |
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267 ngx_chain_t * |
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268 ngx_chain_update_sent(ngx_chain_t *in, off_t sent) |
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269 { |
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270 off_t size; |
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271 |
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272 for ( /* void */ ; in; in = in->next) { |
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273 |
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274 if (ngx_buf_special(in->buf)) { |
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275 continue; |
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276 } |
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277 |
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278 if (sent == 0) { |
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279 break; |
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280 } |
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281 |
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282 size = ngx_buf_size(in->buf); |
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283 |
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284 if (sent >= size) { |
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285 sent -= size; |
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286 |
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287 if (ngx_buf_in_memory(in->buf)) { |
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288 in->buf->pos = in->buf->last; |
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289 } |
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290 |
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291 if (in->buf->in_file) { |
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292 in->buf->file_pos = in->buf->file_last; |
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293 } |
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294 |
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295 continue; |
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296 } |
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297 |
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298 if (ngx_buf_in_memory(in->buf)) { |
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299 in->buf->pos += (size_t) sent; |
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300 } |
f9c83484d9ce
Moved the code for adjusting sent buffers in a separate function.
Valentin Bartenev <vbart@nginx.com>
parents:
4412
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changeset
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301 |
f9c83484d9ce
Moved the code for adjusting sent buffers in a separate function.
Valentin Bartenev <vbart@nginx.com>
parents:
4412
diff
changeset
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302 if (in->buf->in_file) { |
f9c83484d9ce
Moved the code for adjusting sent buffers in a separate function.
Valentin Bartenev <vbart@nginx.com>
parents:
4412
diff
changeset
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303 in->buf->file_pos += sent; |
f9c83484d9ce
Moved the code for adjusting sent buffers in a separate function.
Valentin Bartenev <vbart@nginx.com>
parents:
4412
diff
changeset
|
304 } |
f9c83484d9ce
Moved the code for adjusting sent buffers in a separate function.
Valentin Bartenev <vbart@nginx.com>
parents:
4412
diff
changeset
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305 |
f9c83484d9ce
Moved the code for adjusting sent buffers in a separate function.
Valentin Bartenev <vbart@nginx.com>
parents:
4412
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changeset
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306 break; |
f9c83484d9ce
Moved the code for adjusting sent buffers in a separate function.
Valentin Bartenev <vbart@nginx.com>
parents:
4412
diff
changeset
|
307 } |
f9c83484d9ce
Moved the code for adjusting sent buffers in a separate function.
Valentin Bartenev <vbart@nginx.com>
parents:
4412
diff
changeset
|
308 |
f9c83484d9ce
Moved the code for adjusting sent buffers in a separate function.
Valentin Bartenev <vbart@nginx.com>
parents:
4412
diff
changeset
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309 return in; |
f9c83484d9ce
Moved the code for adjusting sent buffers in a separate function.
Valentin Bartenev <vbart@nginx.com>
parents:
4412
diff
changeset
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310 } |