Mercurial > hg > nginx-quic
annotate src/core/ngx_list.c @ 4385:70ba81827472
Cache locks initial implementation.
New directives: proxy_cache_lock on/off, proxy_cache_lock_timeout. With
proxy_cache_lock set to on, only one request will be allowed to go to
upstream for a particular cache item. Others will wait for a response
to appear in cache (or cache lock released) up to proxy_cache_lock_timeout.
Waiting requests will recheck if they have cached response ready (or are
allowed to run) every 500ms.
Note: we intentionally don't intercept NGX_DECLINED possibly returned by
ngx_http_file_cache_read(). This needs more work (possibly safe, but needs
further investigation). Anyway, it's exceptional situation.
Note: probably there should be a way to disable caching of responses
if there is already one request fetching resource to cache (without waiting
at all). Two possible ways include another cache lock option ("no_cache")
or using proxy_no_cache with some supplied variable.
Note: probably there should be a way to lock updating requests as well. For
now "proxy_cache_use_stale updating" is available.
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Mon, 26 Dec 2011 11:15:23 +0000 |
parents | 791ea37bc944 |
children | d620f497c50f |
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 |
766 | 11 ngx_list_t * |
12 ngx_list_create(ngx_pool_t *pool, ngx_uint_t n, size_t size) | |
13 { | |
14 ngx_list_t *list; | |
15 | |
16 list = ngx_palloc(pool, sizeof(ngx_list_t)); | |
17 if (list == NULL) { | |
18 return NULL; | |
19 } | |
20 | |
21 list->part.elts = ngx_palloc(pool, n * size); | |
22 if (list->part.elts == NULL) { | |
23 return NULL; | |
24 } | |
25 | |
26 list->part.nelts = 0; | |
27 list->part.next = NULL; | |
28 list->last = &list->part; | |
29 list->size = size; | |
30 list->nalloc = n; | |
31 list->pool = pool; | |
32 | |
33 return list; | |
34 } | |
35 | |
36 | |
37 void * | |
38 ngx_list_push(ngx_list_t *l) | |
414
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39 { |
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40 void *elt; |
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41 ngx_list_part_t *last; |
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42 |
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43 last = l->last; |
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44 |
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45 if (last->nelts == l->nalloc) { |
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46 |
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47 /* the last part is full, allocate a new list part */ |
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48 |
501 | 49 last = ngx_palloc(l->pool, sizeof(ngx_list_part_t)); |
50 if (last == NULL) { | |
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51 return NULL; |
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52 } |
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501 | 54 last->elts = ngx_palloc(l->pool, l->nalloc * l->size); |
55 if (last->elts == NULL) { | |
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56 return NULL; |
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57 } |
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58 |
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59 last->nelts = 0; |
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60 last->next = NULL; |
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61 |
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62 l->last->next = last; |
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63 l->last = last; |
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64 } |
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65 |
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66 elt = (char *) last->elts + l->size * last->nelts; |
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67 last->nelts++; |
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68 |
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69 return elt; |
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70 } |