3 * Copyright (C) Igor Sysoev
7 #ifndef _NGX_HTTP_CACHE_H_INCLUDED_
8 #define _NGX_HTTP_CACHE_H_INCLUDED_
11 #include <ngx_config.h>
17 * The 3 bits allows the 7 uses before the cache entry allocation.
18 * We can use maximum 7 bits, i.e up to the 127 uses.
20 #define NGX_HTTP_CACHE_LAZY_ALLOCATION_BITS 3
28 unsigned refs:20; /* 1048576 references */
30 unsigned count:NGX_HTTP_CACHE_LAZY_ALLOCATION_BITS;
39 #if (NGX_USE_HTTP_FILE_CACHE_UNIQ)
40 ngx_file_uniq_t uniq; /* no needed with kqueue */
49 } ngx_http_cache_entry_t;
59 } ngx_http_cache_header_t;
62 #define NGX_HTTP_CACHE_HASH 7
63 #define NGX_HTTP_CACHE_NELTS 4
66 ngx_http_cache_entry_t *elts;
75 } ngx_http_cache_hash_t;
79 ngx_http_cache_hash_t *hash;
80 ngx_http_cache_entry_t *cache;
110 } ngx_http_cache_ctx_t;
113 #define NGX_HTTP_CACHE_STALE 1
114 #define NGX_HTTP_CACHE_AGED 2
115 #define NGX_HTTP_CACHE_THE_SAME 3
118 ngx_int_t ngx_http_cache_get(ngx_http_request_t *r, ngx_http_cache_ctx_t *ctx);
120 ngx_int_t ngx_http_file_cache_get(ngx_http_request_t *r,
121 ngx_http_cache_ctx_t *ctx);
123 ngx_int_t ngx_http_file_cache_open(ngx_http_cache_t *c);
125 ngx_int_t ngx_http_cache_cleaner_handler(ngx_gc_t *gc, ngx_str_t *name,
131 ngx_http_cache_t *ngx_http_cache_get(ngx_http_cache_hash_t *cache,
132 ngx_http_cleanup_t *cleanup,
133 ngx_str_t *key, uint32_t *crc);
135 ngx_http_cache_t *ngx_http_cache_alloc(ngx_http_cache_hash_t *hash,
136 ngx_http_cache_t *cache,
137 ngx_http_cleanup_t *cleanup,
138 ngx_str_t *key, uint32_t crc,
139 ngx_str_t *value, ngx_log_t *log);
140 void ngx_http_cache_free(ngx_http_cache_t *cache,
141 ngx_str_t *key, ngx_str_t *value, ngx_log_t *log);
142 void ngx_http_cache_lock(ngx_http_cache_hash_t *hash, ngx_http_cache_t *cache);
143 void ngx_http_cache_unlock(ngx_http_cache_hash_t *hash,
144 ngx_http_cache_t *cache, ngx_log_t *log);
146 int ngx_http_cache_update_file(ngx_http_request_t *r,ngx_http_cache_ctx_t *ctx,
147 ngx_str_t *temp_file);
149 int ngx_http_send_cached(ngx_http_request_t *r);
152 char *ngx_http_set_cache_slot(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
157 #endif /* _NGX_HTTP_CACHE_H_INCLUDED_ */