Mercurial > hg > nginx-quic
annotate src/core/ngx_radix_tree.h @ 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 | 45a460f82aec |
children | 62be1c4edfba 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 #ifndef _NGX_RADIX_TREE_H_INCLUDED_ |
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8 #define _NGX_RADIX_TREE_H_INCLUDED_ |
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11 #include <ngx_config.h> |
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12 #include <ngx_core.h> |
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485 | 15 #define NGX_RADIX_NO_VALUE (uintptr_t) -1 |
16 | |
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17 typedef struct ngx_radix_node_s ngx_radix_node_t; |
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18 |
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19 struct ngx_radix_node_s { |
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20 ngx_radix_node_t *right; |
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21 ngx_radix_node_t *left; |
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22 ngx_radix_node_t *parent; |
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23 uintptr_t value; |
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24 }; |
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25 |
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26 |
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27 typedef struct { |
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28 ngx_radix_node_t *root; |
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29 ngx_pool_t *pool; |
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30 ngx_radix_node_t *free; |
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31 char *start; |
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32 size_t size; |
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33 } ngx_radix_tree_t; |
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34 |
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487 | 36 ngx_radix_tree_t *ngx_radix_tree_create(ngx_pool_t *pool, |
489 | 37 ngx_int_t preallocate); |
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38 ngx_int_t ngx_radix32tree_insert(ngx_radix_tree_t *tree, |
487 | 39 uint32_t key, uint32_t mask, uintptr_t value); |
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40 ngx_int_t ngx_radix32tree_delete(ngx_radix_tree_t *tree, |
487 | 41 uint32_t key, uint32_t mask); |
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42 uintptr_t ngx_radix32tree_find(ngx_radix_tree_t *tree, uint32_t key); |
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45 #endif /* _NGX_RADIX_TREE_H_INCLUDED_ */ |