Mercurial > hg > nginx-quic
annotate src/core/ngx_palloc.c @ 5650:363395795384
SPDY: moved a variable initialization near to its check.
This should prevent attempts of using pointer before it was checked, since
all modern compilers are able to spot access to uninitialized variable.
No functional changes.
author | Valentin Bartenev <vbart@nginx.com> |
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date | Wed, 09 Apr 2014 18:15:32 +0400 |
parents | 320abeb364e6 |
children | c45c9812cf11 |
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. |
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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 |
2049 | 12 static void *ngx_palloc_block(ngx_pool_t *pool, size_t size); |
13 static void *ngx_palloc_large(ngx_pool_t *pool, size_t size); | |
14 | |
15 | |
501 | 16 ngx_pool_t * |
17 ngx_create_pool(size_t size, ngx_log_t *log) | |
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18 { |
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19 ngx_pool_t *p; |
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20 |
3388 | 21 p = ngx_memalign(NGX_POOL_ALIGNMENT, size, log); |
501 | 22 if (p == NULL) { |
527 | 23 return NULL; |
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24 } |
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25 |
2049 | 26 p->d.last = (u_char *) p + sizeof(ngx_pool_t); |
27 p->d.end = (u_char *) p + size; | |
28 p->d.next = NULL; | |
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29 p->d.failed = 0; |
2049 | 30 |
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31 size = size - sizeof(ngx_pool_t); |
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32 p->max = (size < NGX_MAX_ALLOC_FROM_POOL) ? size : NGX_MAX_ALLOC_FROM_POOL; |
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33 |
581 | 34 p->current = p; |
35 p->chain = NULL; | |
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36 p->large = NULL; |
509 | 37 p->cleanup = NULL; |
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38 p->log = log; |
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39 |
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40 return p; |
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41 } |
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43 |
501 | 44 void |
45 ngx_destroy_pool(ngx_pool_t *pool) | |
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46 { |
509 | 47 ngx_pool_t *p, *n; |
48 ngx_pool_large_t *l; | |
49 ngx_pool_cleanup_t *c; | |
50 | |
51 for (c = pool->cleanup; c; c = c->next) { | |
52 if (c->handler) { | |
1744 | 53 ngx_log_debug1(NGX_LOG_DEBUG_ALLOC, pool->log, 0, |
54 "run cleanup: %p", c); | |
509 | 55 c->handler(c->data); |
56 } | |
57 } | |
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58 |
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59 for (l = pool->large; l; l = l->next) { |
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60 |
461 | 61 ngx_log_debug1(NGX_LOG_DEBUG_ALLOC, pool->log, 0, "free: %p", l->alloc); |
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62 |
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63 if (l->alloc) { |
477 | 64 ngx_free(l->alloc); |
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65 } |
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66 } |
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68 #if (NGX_DEBUG) |
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69 |
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70 /* |
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71 * we could allocate the pool->log from this pool |
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72 * so we cannot use this log while free()ing the pool |
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73 */ |
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74 |
2049 | 75 for (p = pool, n = pool->d.next; /* void */; p = n, n = n->d.next) { |
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76 ngx_log_debug2(NGX_LOG_DEBUG_ALLOC, pool->log, 0, |
2049 | 77 "free: %p, unused: %uz", p, p->d.end - p->d.last); |
133
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78 |
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79 if (n == NULL) { |
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80 break; |
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81 } |
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82 } |
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83 |
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84 #endif |
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85 |
2049 | 86 for (p = pool, n = pool->d.next; /* void */; p = n, n = n->d.next) { |
477 | 87 ngx_free(p); |
128
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88 |
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89 if (n == NULL) { |
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90 break; |
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91 } |
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92 } |
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93 } |
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95 |
2337 | 96 void |
97 ngx_reset_pool(ngx_pool_t *pool) | |
98 { | |
99 ngx_pool_t *p; | |
100 ngx_pool_large_t *l; | |
101 | |
102 for (l = pool->large; l; l = l->next) { | |
103 if (l->alloc) { | |
104 ngx_free(l->alloc); | |
105 } | |
106 } | |
107 | |
108 for (p = pool; p; p = p->d.next) { | |
109 p->d.last = (u_char *) p + sizeof(ngx_pool_t); | |
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110 p->d.failed = 0; |
2337 | 111 } |
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112 |
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113 pool->current = pool; |
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114 pool->chain = NULL; |
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115 pool->large = NULL; |
2337 | 116 } |
117 | |
118 | |
501 | 119 void * |
120 ngx_palloc(ngx_pool_t *pool, size_t size) | |
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121 { |
2049 | 122 u_char *m; |
123 ngx_pool_t *p; | |
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124 |
2049 | 125 if (size <= pool->max) { |
126 | |
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127 p = pool->current; |
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128 |
2049 | 129 do { |
130 m = ngx_align_ptr(p->d.last, NGX_ALIGNMENT); | |
589 | 131 |
2049 | 132 if ((size_t) (p->d.end - m) >= size) { |
133 p->d.last = m + size; | |
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134 |
2049 | 135 return m; |
589 | 136 } |
104
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137 |
2049 | 138 p = p->d.next; |
139 | |
140 } while (p); | |
141 | |
142 return ngx_palloc_block(pool, size); | |
143 } | |
144 | |
145 return ngx_palloc_large(pool, size); | |
146 } | |
147 | |
148 | |
149 void * | |
150 ngx_pnalloc(ngx_pool_t *pool, size_t size) | |
151 { | |
152 u_char *m; | |
153 ngx_pool_t *p; | |
154 | |
155 if (size <= pool->max) { | |
156 | |
157 p = pool->current; | |
158 | |
159 do { | |
160 m = p->d.last; | |
161 | |
162 if ((size_t) (p->d.end - m) >= size) { | |
163 p->d.last = m + size; | |
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164 |
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165 return m; |
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166 } |
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167 |
2049 | 168 p = p->d.next; |
169 | |
170 } while (p); | |
171 | |
172 return ngx_palloc_block(pool, size); | |
173 } | |
174 | |
175 return ngx_palloc_large(pool, size); | |
176 } | |
177 | |
581 | 178 |
2049 | 179 static void * |
180 ngx_palloc_block(ngx_pool_t *pool, size_t size) | |
181 { | |
182 u_char *m; | |
2055 | 183 size_t psize; |
2049 | 184 ngx_pool_t *p, *new, *current; |
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185 |
2055 | 186 psize = (size_t) (pool->d.end - (u_char *) pool); |
187 | |
3388 | 188 m = ngx_memalign(NGX_POOL_ALIGNMENT, psize, pool->log); |
2056 | 189 if (m == NULL) { |
2049 | 190 return NULL; |
191 } | |
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192 |
2056 | 193 new = (ngx_pool_t *) m; |
194 | |
195 new->d.end = m + psize; | |
2055 | 196 new->d.next = NULL; |
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197 new->d.failed = 0; |
2055 | 198 |
2056 | 199 m += sizeof(ngx_pool_data_t); |
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200 m = ngx_align_ptr(m, NGX_ALIGNMENT); |
2056 | 201 new->d.last = m + size; |
202 | |
2049 | 203 current = pool->current; |
204 | |
205 for (p = current; p->d.next; p = p->d.next) { | |
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206 if (p->d.failed++ > 4) { |
2049 | 207 current = p->d.next; |
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208 } |
2049 | 209 } |
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210 |
2049 | 211 p->d.next = new; |
212 | |
213 pool->current = current ? current : new; | |
581 | 214 |
2049 | 215 return m; |
216 } | |
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217 |
2049 | 218 |
219 static void * | |
220 ngx_palloc_large(ngx_pool_t *pool, size_t size) | |
221 { | |
222 void *p; | |
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223 ngx_uint_t n; |
2049 | 224 ngx_pool_large_t *large; |
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225 |
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226 p = ngx_alloc(size, pool->log); |
501 | 227 if (p == NULL) { |
347
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228 return NULL; |
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229 } |
2129 | 230 |
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231 n = 0; |
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232 |
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233 for (large = pool->large; large; large = large->next) { |
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234 if (large->alloc == NULL) { |
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235 large->alloc = p; |
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236 return p; |
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237 } |
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238 |
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239 if (n++ > 3) { |
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240 break; |
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241 } |
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242 } |
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243 |
2129 | 244 large = ngx_palloc(pool, sizeof(ngx_pool_large_t)); |
245 if (large == NULL) { | |
246 ngx_free(p); | |
247 return NULL; | |
248 } | |
249 | |
250 large->alloc = p; | |
251 large->next = pool->large; | |
252 pool->large = large; | |
253 | |
254 return p; | |
255 } | |
256 | |
257 | |
258 void * | |
259 ngx_pmemalign(ngx_pool_t *pool, size_t size, size_t alignment) | |
260 { | |
261 void *p; | |
262 ngx_pool_large_t *large; | |
263 | |
264 p = ngx_memalign(alignment, size, pool->log); | |
265 if (p == NULL) { | |
266 return NULL; | |
267 } | |
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268 |
629 | 269 large = ngx_palloc(pool, sizeof(ngx_pool_large_t)); |
270 if (large == NULL) { | |
1317 | 271 ngx_free(p); |
629 | 272 return NULL; |
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273 } |
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274 |
156
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275 large->alloc = p; |
629 | 276 large->next = pool->large; |
277 pool->large = large; | |
156
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278 |
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279 return p; |
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280 } |
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281 |
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282 |
501 | 283 ngx_int_t |
284 ngx_pfree(ngx_pool_t *pool, void *p) | |
156
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285 { |
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286 ngx_pool_large_t *l; |
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287 |
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288 for (l = pool->large; l; l = l->next) { |
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289 if (p == l->alloc) { |
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290 ngx_log_debug1(NGX_LOG_DEBUG_ALLOC, pool->log, 0, |
461 | 291 "free: %p", l->alloc); |
477 | 292 ngx_free(l->alloc); |
156
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293 l->alloc = NULL; |
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294 |
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295 return NGX_OK; |
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296 } |
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297 } |
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298 |
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299 return NGX_DECLINED; |
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300 } |
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301 |
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302 |
501 | 303 void * |
304 ngx_pcalloc(ngx_pool_t *pool, size_t size) | |
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305 { |
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306 void *p; |
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307 |
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308 p = ngx_palloc(pool, size); |
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309 if (p) { |
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310 ngx_memzero(p, size); |
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311 } |
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312 |
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313 return p; |
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314 } |
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315 |
509 | 316 |
317 ngx_pool_cleanup_t * | |
563 | 318 ngx_pool_cleanup_add(ngx_pool_t *p, size_t size) |
509 | 319 { |
320 ngx_pool_cleanup_t *c; | |
321 | |
322 c = ngx_palloc(p, sizeof(ngx_pool_cleanup_t)); | |
323 if (c == NULL) { | |
324 return NULL; | |
325 } | |
326 | |
563 | 327 if (size) { |
328 c->data = ngx_palloc(p, size); | |
329 if (c->data == NULL) { | |
330 return NULL; | |
331 } | |
332 | |
333 } else { | |
334 c->data = NULL; | |
335 } | |
336 | |
337 c->handler = NULL; | |
509 | 338 c->next = p->cleanup; |
339 | |
340 p->cleanup = c; | |
341 | |
563 | 342 ngx_log_debug1(NGX_LOG_DEBUG_ALLOC, p->log, 0, "add cleanup: %p", c); |
343 | |
509 | 344 return c; |
345 } | |
346 | |
347 | |
348 void | |
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349 ngx_pool_run_cleanup_file(ngx_pool_t *p, ngx_fd_t fd) |
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350 { |
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351 ngx_pool_cleanup_t *c; |
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352 ngx_pool_cleanup_file_t *cf; |
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353 |
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354 for (c = p->cleanup; c; c = c->next) { |
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355 if (c->handler == ngx_pool_cleanup_file) { |
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356 |
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357 cf = c->data; |
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358 |
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359 if (cf->fd == fd) { |
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360 c->handler(cf); |
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361 c->handler = NULL; |
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362 return; |
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363 } |
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364 } |
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365 } |
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366 } |
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367 |
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368 |
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369 void |
509 | 370 ngx_pool_cleanup_file(void *data) |
371 { | |
372 ngx_pool_cleanup_file_t *c = data; | |
373 | |
1744 | 374 ngx_log_debug1(NGX_LOG_DEBUG_ALLOC, c->log, 0, "file cleanup: fd:%d", |
375 c->fd); | |
563 | 376 |
509 | 377 if (ngx_close_file(c->fd) == NGX_FILE_ERROR) { |
378 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno, | |
379 ngx_close_file_n " \"%s\" failed", c->name); | |
380 } | |
381 } | |
382 | |
383 | |
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384 void |
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385 ngx_pool_delete_file(void *data) |
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386 { |
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387 ngx_pool_cleanup_file_t *c = data; |
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388 |
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389 ngx_err_t err; |
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390 |
1744 | 391 ngx_log_debug2(NGX_LOG_DEBUG_ALLOC, c->log, 0, "file cleanup: fd:%d %s", |
392 c->fd, c->name); | |
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393 |
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394 if (ngx_delete_file(c->name) == NGX_FILE_ERROR) { |
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395 err = ngx_errno; |
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396 |
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397 if (err != NGX_ENOENT) { |
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398 ngx_log_error(NGX_LOG_CRIT, c->log, err, |
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399 ngx_delete_file_n " \"%s\" failed", c->name); |
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400 } |
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401 } |
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402 |
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403 if (ngx_close_file(c->fd) == NGX_FILE_ERROR) { |
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404 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno, |
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405 ngx_close_file_n " \"%s\" failed", c->name); |
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406 } |
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407 } |
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408 |
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409 |
346
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410 #if 0 |
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411 |
501 | 412 static void * |
413 ngx_get_cached_block(size_t size) | |
346
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414 { |
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Igor Sysoev <igor@sysoev.ru>
parents:
297
diff
changeset
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415 void *p; |
55e496a8ece3
nginx-0.0.3-2004-06-06-23:49:18 import
Igor Sysoev <igor@sysoev.ru>
parents:
297
diff
changeset
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416 ngx_cached_block_slot_t *slot; |
55e496a8ece3
nginx-0.0.3-2004-06-06-23:49:18 import
Igor Sysoev <igor@sysoev.ru>
parents:
297
diff
changeset
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417 |
55e496a8ece3
nginx-0.0.3-2004-06-06-23:49:18 import
Igor Sysoev <igor@sysoev.ru>
parents:
297
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changeset
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418 if (ngx_cycle->cache == NULL) { |
55e496a8ece3
nginx-0.0.3-2004-06-06-23:49:18 import
Igor Sysoev <igor@sysoev.ru>
parents:
297
diff
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419 return NULL; |
55e496a8ece3
nginx-0.0.3-2004-06-06-23:49:18 import
Igor Sysoev <igor@sysoev.ru>
parents:
297
diff
changeset
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420 } |
55e496a8ece3
nginx-0.0.3-2004-06-06-23:49:18 import
Igor Sysoev <igor@sysoev.ru>
parents:
297
diff
changeset
|
421 |
55e496a8ece3
nginx-0.0.3-2004-06-06-23:49:18 import
Igor Sysoev <igor@sysoev.ru>
parents:
297
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changeset
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422 slot = &ngx_cycle->cache[(size + ngx_pagesize - 1) / ngx_pagesize]; |
55e496a8ece3
nginx-0.0.3-2004-06-06-23:49:18 import
Igor Sysoev <igor@sysoev.ru>
parents:
297
diff
changeset
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423 |
55e496a8ece3
nginx-0.0.3-2004-06-06-23:49:18 import
Igor Sysoev <igor@sysoev.ru>
parents:
297
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changeset
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424 slot->tries++; |
55e496a8ece3
nginx-0.0.3-2004-06-06-23:49:18 import
Igor Sysoev <igor@sysoev.ru>
parents:
297
diff
changeset
|
425 |
55e496a8ece3
nginx-0.0.3-2004-06-06-23:49:18 import
Igor Sysoev <igor@sysoev.ru>
parents:
297
diff
changeset
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426 if (slot->number) { |
55e496a8ece3
nginx-0.0.3-2004-06-06-23:49:18 import
Igor Sysoev <igor@sysoev.ru>
parents:
297
diff
changeset
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427 p = slot->block; |
55e496a8ece3
nginx-0.0.3-2004-06-06-23:49:18 import
Igor Sysoev <igor@sysoev.ru>
parents:
297
diff
changeset
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428 slot->block = slot->block->next; |
55e496a8ece3
nginx-0.0.3-2004-06-06-23:49:18 import
Igor Sysoev <igor@sysoev.ru>
parents:
297
diff
changeset
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429 slot->number--; |
55e496a8ece3
nginx-0.0.3-2004-06-06-23:49:18 import
Igor Sysoev <igor@sysoev.ru>
parents:
297
diff
changeset
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430 return p; |
55e496a8ece3
nginx-0.0.3-2004-06-06-23:49:18 import
Igor Sysoev <igor@sysoev.ru>
parents:
297
diff
changeset
|
431 } |
55e496a8ece3
nginx-0.0.3-2004-06-06-23:49:18 import
Igor Sysoev <igor@sysoev.ru>
parents:
297
diff
changeset
|
432 |
55e496a8ece3
nginx-0.0.3-2004-06-06-23:49:18 import
Igor Sysoev <igor@sysoev.ru>
parents:
297
diff
changeset
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433 return NULL; |
55e496a8ece3
nginx-0.0.3-2004-06-06-23:49:18 import
Igor Sysoev <igor@sysoev.ru>
parents:
297
diff
changeset
|
434 } |
55e496a8ece3
nginx-0.0.3-2004-06-06-23:49:18 import
Igor Sysoev <igor@sysoev.ru>
parents:
297
diff
changeset
|
435 |
55e496a8ece3
nginx-0.0.3-2004-06-06-23:49:18 import
Igor Sysoev <igor@sysoev.ru>
parents:
297
diff
changeset
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436 #endif |