NGX_LEVEL_EVENT  2188 core/ngx_resolver.c                     /* select, poll, /dev/poll */       NGX_LEVEL_EVENT;
NGX_LEVEL_EVENT   300 event/ngx_event.c             if (ngx_add_event(rev, NGX_READ_EVENT, NGX_LEVEL_EVENT)
NGX_LEVEL_EVENT   310 event/ngx_event.c             if (ngx_del_event(rev, NGX_READ_EVENT, NGX_LEVEL_EVENT | flags)
NGX_LEVEL_EVENT   379 event/ngx_event.c             if (ngx_add_event(wev, NGX_WRITE_EVENT, NGX_LEVEL_EVENT)
NGX_LEVEL_EVENT   389 event/ngx_event.c             if (ngx_del_event(wev, NGX_WRITE_EVENT, NGX_LEVEL_EVENT)
NGX_LEVEL_EVENT   217 event/ngx_event_connect.c         event = NGX_LEVEL_EVENT;