Mercurial > hg > nginx-quic
view src/mysql/ngx_mysql.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> |
---|---|
date | Mon, 26 Dec 2011 11:15:23 +0000 |
parents | 7cbef16c71a1 |
children | d620f497c50f |
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/* * Copyright (C) Igor Sysoev */ #ifndef _NGX_MYSQL_H_INCLUDED_ #define _NGX_MYSQL_H_INCLUDED_ #include <ngx_config.h> #include <ngx_core.h> #include <ngx_event.h> #include <ngx_event_connect.h> typedef struct ngx_mysql_s ngx_mysql_t; typedef void (*ngx_mysql_handler_pt)(ngx_mysql_t *m); struct ngx_mysql_s { ngx_peer_connection_t peer; ngx_buf_t *buf; ngx_pool_t *pool; ngx_str_t *login; ngx_str_t *passwd; ngx_str_t *database; ngx_str_t query; ngx_uint_t pktn; ngx_mysql_handler_pt handler; void *data; ngx_int_t state; }; #define NGX_MYSQL_CMDPKT_LEN 5 #if (NGX_HAVE_LITTLE_ENDIAN && NGX_HAVE_NONALIGNED && 0) #define ngx_m16toh(n) (*(uint32_t *) n & 0x0000ffff) #define ngx_m24toh(n) (*(uint32_t *) n & 0x00ffffff) #define ngx_m32toh(n) *(uint32_t *) n #define ngx_htom16(n, m) *(uint16_t *) n = (uint16_t) ((m) & 0xffff) #define ngx_htom24(n, m) (n)[0] = (u_char) ((m) & 0xff); \ (n)[1] = (u_char) (((m) >> 8) & 0xff); \ (n)[2] = (u_char) (((m) >> 16) & 0xff) #define ngx_htom32(n, m) *(uint32_t *) (n) = (m) #else #define ngx_m16toh(n) (n[0] | n[1] << 8) #define ngx_m24toh(n) (n[0] | n[1] << 8 | n[2] << 16) #define ngx_m32toh(n) (n[0] | n[1] << 8 | n[2] << 16 | n[3] << 24) #define ngx_htom16(n, m) (n)[0] = (u_char) (m); (n)[1] = (u_char) ((m) >> 8) #define ngx_htom24(n, m) (n)[0] = (u_char) ((m) & 0xff); \ (n)[1] = (u_char) (((m) >> 8) & 0xff); \ (n)[2] = (u_char) (((m) >> 16) & 0xff) #define ngx_htom32(n, m) (n)[0] = (u_char) ((m) & 0xff); \ (n)[1] = (u_char) (((m) >> 8) & 0xff); \ (n)[2] = (u_char) (((m) >> 16) & 0xff); \ (n)[3] = (u_char) (((m) >> 24) & 0xff) #endif ngx_int_t ngx_mysql_connect(ngx_mysql_t *m); ngx_int_t ngx_mysql_query(ngx_mysql_t *m); #endif /* _NGX_MYSQL_H_INCLUDED_ */