nginx中accept处理

最新推荐文章于 2025-01-08 22:32:57 发布

Zephyr1989

最新推荐文章于 2025-01-08 22:32:57 发布

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分类专栏： nginx服务器源码分析文章标签： nginx events socket module delete each

本文链接：https://blog.youkuaiyun.com/Zephyr1989/article/details/7275118

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函数位置：ngx_event.c

函数原型：static ngx_int_t ngx_event_process_init(ngx_cycle_t *cycle)

函数功能：处理accept请求

函数详解：

   ccf = (ngx_core_conf_t *) ngx_get_conf(cycle->conf_ctx, ngx_core_module);
   ecf = ngx_event_get_conf(cycle->conf_ctx, ngx_event_core_module);

这两行主要是获取配置文件

  ngx_posted_events_mutex = ngx_mutex_init(cycle->log, 0);

初始化互斥锁

  /* for each listening socket */

    ls = cycle->listening.elts;
    for (i = 0; i < cycle->listening.nelts; i++) {             //遍历监听数组

        c = ngx_get_connection(ls[i].fd, cycle->log);          //从连接池中查找空闲连接

        if (c == NULL) {
            return NGX_ERROR;
        }

        c->log = &ls[i].log;                                   //对connect各成员赋值初始化

        c->listening = &ls[i];
        ls[i].connection = c;

        rev = c->read;                                         //准备设置读写的结构

        rev->log = c->log;
        rev->accept = 1;

#if (NGX_HAVE_DEFERRED_ACCEPT)
        rev->deferred_accept = ls[i].deferred_accept;
#endif

        if (!(ngx_event_flags & NGX_USE_IOCP_EVENT)) {
            if (ls[i].previous) {

                /*
                 * delete the old accept events that were bound to
                 * the old cycle read events array
                 */

                old = ls[i].previous->connection;

                if (ngx_del_event(old->read, NGX_READ_EVENT, NGX_CLOSE_EVENT)
                    == NGX_ERROR)
                {
                    return NGX_ERROR;
                }

                old->fd = (ngx_socket_t) -1;
            }
        }

#if (NGX_WIN32)

        if (ngx_event_flags & NGX_USE_IOCP_EVENT) {
            ngx_iocp_conf_t  *iocpcf;

            rev->handler = ngx_event_acceptex;

            if (ngx_use_accept_mutex) {
                continue;
            }

            if (ngx_add_event(rev, 0, NGX_IOCP_ACCEPT) == NGX_ERROR) {
                return NGX_ERROR;
            }

            ls[i].log.handler = ngx_acceptex_log_error;

            iocpcf = ngx_event_get_conf(cycle->conf_ctx, ngx_iocp_module);
            if (ngx_event_post_acceptex(&ls[i], iocpcf->post_acceptex)
                == NGX_ERROR)
            {
                return NGX_ERROR;
            }

        } else {
            rev->handler = ngx_event_accept;                 //获取初始化句柄

            if (ngx_use_accept_mutex) {
                continue;
            }

            if (ngx_add_event(rev, NGX_READ_EVENT, 0) == NGX_ERROR) {
                return NGX_ERROR;
            }
        }

#else

        rev->handler = ngx_event_accept;                    

        if (ngx_use_accept_mutex) {
            continue;
        }

        if (ngx_event_flags & NGX_USE_RTSIG_EVENT) {
            if (ngx_add_conn(c) == NGX_ERROR) {
                return NGX_ERROR;
            }

        } else {
            if (ngx_add_event(rev, NGX_READ_EVENT, 0) == NGX_ERROR) {
                return NGX_ERROR;
            }
        }

#endif

    }

以上代码主要工作就是从空闲连接池中获取一个空闲连接，并初始化连接，并连接的socket放到epoll中监听