rd                 66 http/modules/ngx_http_stub_status_module.c     ngx_atomic_int_t   ap, hn, ac, rq, rd, wr;
rd                107 http/modules/ngx_http_stub_status_module.c     rd = *ngx_stat_reading;
rd                118 http/modules/ngx_http_stub_status_module.c                           rd, wr, ac - (rd + wr));