prev_last_shadow  432 event/ngx_event_pipe.c     ngx_uint_t         flush, flushed, prev_last_shadow;
prev_last_shadow  549 event/ngx_event_pipe.c         prev_last_shadow = 1;
prev_last_shadow  579 event/ngx_event_pipe.c                     if (!prev_last_shadow) {
prev_last_shadow  595 event/ngx_event_pipe.c                 prev_last_shadow = cl->buf->last_shadow;