NGX_USE_IOCP_EVENT  637 core/ngx_connection.c     if (ngx_event_flags & NGX_USE_IOCP_EVENT) {
NGX_USE_IOCP_EVENT  758 event/ngx_event.c         if (!(ngx_event_flags & NGX_USE_IOCP_EVENT)) {
NGX_USE_IOCP_EVENT  780 event/ngx_event.c         if (ngx_event_flags & NGX_USE_IOCP_EVENT) {