void dispatch()
{
PCB *pcb;
if(PTBR->pcb->status == running)
{ /*insert process in ready queue*/
insert_ready(PTBR->pcb);
}
//pcb = hf; //if pcb = head here, would it ever go to hb?
if(pcb == hf)
{
PTBR = pcb->page_tbl;
prepage(pcb);
pcb->status = running;
pcb->last_dispatch = get_clock();
set_timer(Quantum);
insert_background(PTBR->pcb);
}
else if (pcb == hb)
{
PTBR = pcb->page_tbl;
prepage(pcb);
pcb->status = running;
pcb->last_dispatch = get_clock();
set_timer(Quantum);
}
else
{
PTBR = NULL;
}
}
void dispatch() {
if (PTBR != NULL && PTBR->pcb->status == running) {
if (Int_Vector.cause != timeint) {
PTBR->pcb->last_dispatch = get_clock();
return;
}
else if (Int_Vector.cause == timeint) {
insert_ready(PTBR->pcb);
PTBR = NULL;
}
}
PCB *nextPCB = deQueue(&maQ);
if (nextPCB == NULL) {
PTBR = NULL;
return;
}
else {
PTBR = nextPCB->page_tbl;
prepage(nextPCB); // External routine.
nextPCB->status = running;
nextPCB->last_dispatch = get_clock();
set_timer(Quantum); // Same. Must be implemented in OSP.
}
}