PCB_CDSCR
if ((td->td_pcb->pcb_flags & PCB_CDSCR) == 0)
td->td_pcb->pcb_flags |= PCB_CDSCR;
if (pcb_flags & PCB_CDSCR)
if (pcb_flags & PCB_CDSCR)
ASSYM(PCB_CDSCR, PCB_CDSCR);
td->td_pcb->pcb_flags |= PCB_CFSCR | PCB_CDSCR;