Mercurial > hg > nginx-quic
annotate src/core/ngx_crc32.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 | d6afb8723155 |
children | d620f497c50f |
rev | line source |
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790 | 1 |
2 /* | |
3 * Copyright (C) Igor Sysoev | |
4 */ | |
5 | |
6 | |
7 #ifndef _NGX_CRC32_H_INCLUDED_ | |
8 #define _NGX_CRC32_H_INCLUDED_ | |
9 | |
10 | |
11 #include <ngx_config.h> | |
12 #include <ngx_core.h> | |
13 | |
14 | |
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15 extern uint32_t *ngx_crc32_table_short; |
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16 extern uint32_t ngx_crc32_table256[]; |
790 | 17 |
18 | |
19 static ngx_inline uint32_t | |
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20 ngx_crc32_short(u_char *p, size_t len) |
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21 { |
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22 u_char c; |
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23 uint32_t crc; |
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24 |
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25 crc = 0xffffffff; |
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26 |
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27 while (len--) { |
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28 c = *p++; |
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29 crc = ngx_crc32_table_short[(crc ^ (c & 0xf)) & 0xf] ^ (crc >> 4); |
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30 crc = ngx_crc32_table_short[(crc ^ (c >> 4)) & 0xf] ^ (crc >> 4); |
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31 } |
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32 |
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33 return crc ^ 0xffffffff; |
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34 } |
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35 |
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36 |
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37 static ngx_inline uint32_t |
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38 ngx_crc32_long(u_char *p, size_t len) |
790 | 39 { |
40 uint32_t crc; | |
41 | |
42 crc = 0xffffffff; | |
43 | |
44 while (len--) { | |
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45 crc = ngx_crc32_table256[(crc ^ *p++) & 0xff] ^ (crc >> 8); |
790 | 46 } |
47 | |
48 return crc ^ 0xffffffff; | |
49 } | |
50 | |
51 | |
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52 #define ngx_crc32_init(crc) \ |
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53 crc = 0xffffffff |
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54 |
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55 |
1697 | 56 static ngx_inline void |
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57 ngx_crc32_update(uint32_t *crc, u_char *p, size_t len) |
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58 { |
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59 uint32_t c; |
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60 |
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61 c = *crc; |
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62 |
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63 while (len--) { |
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64 c = ngx_crc32_table256[(c ^ *p++) & 0xff] ^ (c >> 8); |
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65 } |
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66 |
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67 *crc = c; |
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68 } |
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69 |
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70 |
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71 #define ngx_crc32_final(crc) \ |
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72 crc ^= 0xffffffff |
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73 |
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74 |
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75 ngx_int_t ngx_crc32_table_init(void); |
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76 |
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77 |
790 | 78 #endif /* _NGX_CRC32_H_INCLUDED_ */ |