Exemple #1
0
static ngx_int_t
ngx_epoll_init(ngx_cycle_t *cycle, ngx_msec_t timer)
{
    ngx_epoll_conf_t  *epcf;

    epcf = ngx_event_get_conf(cycle->conf_ctx, ngx_epoll_module);

    if (ep == -1) {
        ep = epoll_create(cycle->connection_n / 2);

        if (ep == -1) {
            ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno,
                          "epoll_create() failed");
            return NGX_ERROR;
        }

#if (NGX_HAVE_EVENTFD)
        if (ngx_epoll_notify_init(cycle->log) != NGX_OK) {
            ngx_epoll_module_ctx.actions.notify = NULL;
        }
#endif

#if (NGX_HAVE_FILE_AIO)
        ngx_epoll_aio_init(cycle, epcf);
#endif

#if (NGX_HAVE_EPOLLRDHUP)
        ngx_epoll_test_rdhup(cycle);
#endif
    }

    if (nevents < epcf->events) {
        if (event_list) {
            ngx_free(event_list);
        }

        event_list = ngx_alloc(sizeof(struct epoll_event) * epcf->events,
                               cycle->log);
        if (event_list == NULL) {
            return NGX_ERROR;
        }
    }

    nevents = epcf->events;

    ngx_io = ngx_os_io;

    ngx_event_actions = ngx_epoll_module_ctx.actions;

#if (NGX_HAVE_CLEAR_EVENT)
    ngx_event_flags = NGX_USE_CLEAR_EVENT
#else
    ngx_event_flags = NGX_USE_LEVEL_EVENT
#endif
                      |NGX_USE_GREEDY_EVENT
                      |NGX_USE_EPOLL_EVENT;

    return NGX_OK;
}
Exemple #2
0
/**
 *  @param [in] cycle 
 *  @param [in] timer 定时器精度ngx_timer_resolution
 *  @return NGX_OK|NGX_ERROR
 *  
 *  epoll初始化，创建epollFD
 */
static ngx_int_t
ngx_epoll_init(ngx_cycle_t *cycle, ngx_msec_t timer)
{
    ngx_epoll_conf_t  *epcf;

    epcf = ngx_event_get_conf(cycle->conf_ctx, ngx_epoll_module);

    if (ep == -1) {
        ep = epoll_create(cycle->connection_n / 2);		//创建epollFD

        if (ep == -1) {
            ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno,
                          "epoll_create() failed");
            return NGX_ERROR;
        }

#if (NGX_HAVE_EVENTFD)
		//初始化通知notify_fd，将其加入epoll事件中
        if (ngx_epoll_notify_init(cycle->log) != NGX_OK) {
            ngx_epoll_module_ctx.actions.notify = NULL;
        }
#endif

#if (NGX_HAVE_FILE_AIO)
		//异步事件初始化
        ngx_epoll_aio_init(cycle, epcf);

#endif
    }

    if (nevents < epcf->events) {	//默认初始化512个
        if (event_list) {
            ngx_free(event_list);
        }

        //初始化event_list数组。数组大小是配置项epoll_event的參数
        event_list = ngx_alloc(sizeof(struct epoll_event) * epcf->events,
                               cycle->log);
        if (event_list == NULL) {
            return NGX_ERROR;
        }
    }

    nevents = epcf->events;	//事件个数，epoll_wait用到。

    /**
     *  \file ../../os/unix/ngx_os.h|c
     *  指明客户端连接事件触发时，读写I/O的方法。如消息发送与接受
     *
     *  \file ../../os/unix/ngx_linux_init.h|c
     *  linux中等同于变量ngx_linux_io值
     */
    ngx_io = ngx_os_io;

    /**
     * ngx_event_actions是个全局的ngx_event_actions_t结构体
     * 用于存储不同事件模块的10个函数接口。（添加|删除|...事件、接受|删除|处理..新连接）
     */
    ngx_event_actions = ngx_epoll_module_ctx.actions;
	
	//优先使用边缘触发模式
#if (NGX_HAVE_CLEAR_EVENT)
    ngx_event_flags = NGX_USE_CLEAR_EVENT   //使用epoll的边缘触发模式 ET
#else
    ngx_event_flags = NGX_USE_LEVEL_EVENT   //使用epoll的水平触发模式 LT
#endif
                      |NGX_USE_GREEDY_EVENT
                      |NGX_USE_EPOLL_EVENT;

    return NGX_OK;
}