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view src/stream/ngx_stream_upstream.h @ 6153:4f6efabcb09b

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The "reuseport" option of the "listen" directive. When configured, an individual listen socket on a given address is created for each worker process. This allows to reduce in-kernel lock contention on configurations with high accept rates, resulting in better performance. As of now it works on Linux and DragonFly BSD. Note that on Linux incoming connection requests are currently tied up to a specific listen socket, and if some sockets are closed, connection requests will be reset, see https://lwn.net/Articles/542629/. With nginx, this may happen if the number of worker processes is reduced. There is no such problem on DragonFly BSD. Based on previous work by Sepherosa Ziehau and Yingqi Lu.
author Maxim Dounin <mdounin@mdounin.ru>
date Wed, 20 May 2015 15:51:56 +0300
parents 61d7ae76647d
children fa663739e115
line wrap: on
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/*
 * Copyright (C) Igor Sysoev
 * Copyright (C) Nginx, Inc.
 */


#ifndef _NGX_STREAM_UPSTREAM_H_INCLUDED_
#define _NGX_STREAM_UPSTREAM_H_INCLUDED_


#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_stream.h>
#include <ngx_event_connect.h>


#define NGX_STREAM_UPSTREAM_CREATE        0x0001
#define NGX_STREAM_UPSTREAM_WEIGHT        0x0002
#define NGX_STREAM_UPSTREAM_MAX_FAILS     0x0004
#define NGX_STREAM_UPSTREAM_FAIL_TIMEOUT  0x0008
#define NGX_STREAM_UPSTREAM_DOWN          0x0010
#define NGX_STREAM_UPSTREAM_BACKUP        0x0020


typedef struct {
    ngx_array_t                        upstreams;
                                           /* ngx_stream_upstream_srv_conf_t */
} ngx_stream_upstream_main_conf_t;


typedef struct ngx_stream_upstream_srv_conf_s  ngx_stream_upstream_srv_conf_t;


typedef ngx_int_t (*ngx_stream_upstream_init_pt)(ngx_conf_t *cf,
    ngx_stream_upstream_srv_conf_t *us);
typedef ngx_int_t (*ngx_stream_upstream_init_peer_pt)(ngx_stream_session_t *s,
    ngx_stream_upstream_srv_conf_t *us);


typedef struct {
    ngx_stream_upstream_init_pt        init_upstream;
    ngx_stream_upstream_init_peer_pt   init;
    void                              *data;
} ngx_stream_upstream_peer_t;


typedef struct {
    ngx_str_t                          name;
    ngx_addr_t                        *addrs;
    ngx_uint_t                         naddrs;
    ngx_uint_t                         weight;
    ngx_uint_t                         max_fails;
    time_t                             fail_timeout;

    unsigned                           down:1;
    unsigned                           backup:1;
} ngx_stream_upstream_server_t;


struct ngx_stream_upstream_srv_conf_s {
    ngx_stream_upstream_peer_t         peer;
    void                             **srv_conf;

    ngx_array_t                       *servers;
                                              /* ngx_stream_upstream_server_t */

    ngx_uint_t                         flags;
    ngx_str_t                          host;
    u_char                            *file_name;
    ngx_uint_t                         line;
    in_port_t                          port;
    ngx_uint_t                         no_port;  /* unsigned no_port:1 */

#if (NGX_STREAM_UPSTREAM_ZONE)
    ngx_shm_zone_t                    *shm_zone;
#endif
};


typedef struct {
    ngx_peer_connection_t              peer;
    ngx_buf_t                          downstream_buf;
    ngx_buf_t                          upstream_buf;
    off_t                              received;
#if (NGX_STREAM_SSL)
    ngx_str_t                          ssl_name;
#endif
} ngx_stream_upstream_t;


ngx_stream_upstream_srv_conf_t *ngx_stream_upstream_add(ngx_conf_t *cf,
    ngx_url_t *u, ngx_uint_t flags);


#define ngx_stream_conf_upstream_srv_conf(uscf, module)                       \
    uscf->srv_conf[module.ctx_index]


extern ngx_module_t  ngx_stream_upstream_module;


#endif /* _NGX_STREAM_UPSTREAM_H_INCLUDED_ */