WCS_BUSY
if ((pvc->vc_flags & WCS_BUSY) && pvc->vc_pendc != -1) {
pvc->vc_flags &= ~WCS_BUSY;
if (pvc->vc_flags & (WCS_DELAY|WCS_BUSY|WCS_STOPPED)) {
pvc->vc_flags |= WCS_BUSY;
pvc->vc_flags &= ~WCS_BUSY;
pvc->vc_flags |= WCS_BUSY;