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view src/http/ngx_http_config.h @ 7374:de50fa05fbeb

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Cache: fixed minimum cache keys zone size limit. Size of a shared memory zones must be at least two pages - one page for slab allocator internal data, and another page for actual allocations. Using 8192 instead is wrong, as there are systems with page sizes other than 4096. Note well that two pages is usually too low as well. In particular, cache is likely to use two allocations of different sizes for global structures, and at least four pages will be needed to properly allocate cache nodes. Except in a few very special cases, with keys zone of just two pages nginx won't be able to start. Other uses of shared memory impose a limit of 8 pages, which provides some room for global allocations. This patch doesn't try to address this though. Inspired by ticket #1665.
author Maxim Dounin <mdounin@mdounin.ru>
date Wed, 31 Oct 2018 16:49:39 +0300
parents d620f497c50f
children
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/*
 * Copyright (C) Igor Sysoev
 * Copyright (C) Nginx, Inc.
 */


#ifndef _NGX_HTTP_CONFIG_H_INCLUDED_
#define _NGX_HTTP_CONFIG_H_INCLUDED_


#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>


typedef struct {
    void        **main_conf;
    void        **srv_conf;
    void        **loc_conf;
} ngx_http_conf_ctx_t;


typedef struct {
    ngx_int_t   (*preconfiguration)(ngx_conf_t *cf);
    ngx_int_t   (*postconfiguration)(ngx_conf_t *cf);

    void       *(*create_main_conf)(ngx_conf_t *cf);
    char       *(*init_main_conf)(ngx_conf_t *cf, void *conf);

    void       *(*create_srv_conf)(ngx_conf_t *cf);
    char       *(*merge_srv_conf)(ngx_conf_t *cf, void *prev, void *conf);

    void       *(*create_loc_conf)(ngx_conf_t *cf);
    char       *(*merge_loc_conf)(ngx_conf_t *cf, void *prev, void *conf);
} ngx_http_module_t;


#define NGX_HTTP_MODULE           0x50545448   /* "HTTP" */

#define NGX_HTTP_MAIN_CONF        0x02000000
#define NGX_HTTP_SRV_CONF         0x04000000
#define NGX_HTTP_LOC_CONF         0x08000000
#define NGX_HTTP_UPS_CONF         0x10000000
#define NGX_HTTP_SIF_CONF         0x20000000
#define NGX_HTTP_LIF_CONF         0x40000000
#define NGX_HTTP_LMT_CONF         0x80000000


#define NGX_HTTP_MAIN_CONF_OFFSET  offsetof(ngx_http_conf_ctx_t, main_conf)
#define NGX_HTTP_SRV_CONF_OFFSET   offsetof(ngx_http_conf_ctx_t, srv_conf)
#define NGX_HTTP_LOC_CONF_OFFSET   offsetof(ngx_http_conf_ctx_t, loc_conf)


#define ngx_http_get_module_main_conf(r, module)                             \
    (r)->main_conf[module.ctx_index]
#define ngx_http_get_module_srv_conf(r, module)  (r)->srv_conf[module.ctx_index]
#define ngx_http_get_module_loc_conf(r, module)  (r)->loc_conf[module.ctx_index]


#define ngx_http_conf_get_module_main_conf(cf, module)                        \
    ((ngx_http_conf_ctx_t *) cf->ctx)->main_conf[module.ctx_index]
#define ngx_http_conf_get_module_srv_conf(cf, module)                         \
    ((ngx_http_conf_ctx_t *) cf->ctx)->srv_conf[module.ctx_index]
#define ngx_http_conf_get_module_loc_conf(cf, module)                         \
    ((ngx_http_conf_ctx_t *) cf->ctx)->loc_conf[module.ctx_index]

#define ngx_http_cycle_get_module_main_conf(cycle, module)                    \
    (cycle->conf_ctx[ngx_http_module.index] ?                                 \
        ((ngx_http_conf_ctx_t *) cycle->conf_ctx[ngx_http_module.index])      \
            ->main_conf[module.ctx_index]:                                    \
        NULL)


#endif /* _NGX_HTTP_CONFIG_H_INCLUDED_ */