wb->outcnt = 0;
MP_INLINE apr_status_t modperl_wbucket_flush(modperl_wbucket_t *wb,                                             int add_flush_bucket){    apr_status_t rv = APR_SUCCESS;    if (wb->outcnt) {        rv = modperl_wbucket_pass(wb, wb->outbuf, wb->outcnt,                                  add_flush_bucket);        wb->outcnt = 0;    }    else if (add_flush_bucket) {        rv = send_output_flush(*(wb->filters));    }    return rv;}