1998/0516/pc/trap.c (diff list | history)

1998/0514/sys/src/9/pc/trap.c:140,156 – 1998/0516/sys/src/9/pc/trap.c:140,145 (short | long | prev | next)
Bug fix: don't preempt process if it's already been preempted on this stack. Remove debugging stack overflow check. rsc Fri Mar 4 12:44:25 2005
1997/0327		up->dbgreg = ureg;
1997/1101		}
1991/1112
1998/0512		{ ulong x, y;
1998/0514		if(up) x = (ulong)(up->kstack); else x = (ulong)(m->stack);
1998/0512		y = (ulong)&mach;
1998/0514		if(y < x+512) panic("cpu%d: trap: kstack %lux %lux", m->machno, x, y);
1998/0512		}
1997/0327		v = ureg->trap; if(ctl = irqctl[v]){
1997/1101		if(ctl->isintr){
1998/0514/sys/src/9/pc/trap.c:167,178 – 1998/0516/sys/src/9/pc/trap.c:156,177
1997/0327		if(ctl->eoi) ctl->eoi(v);
1998/0401		/* preemptive scheduling */
1998/0516		/* * preemptive scheduling. to limit stack depth, * make sure process has a chance to return from * the current interrupt before being preempted a * second time. */
1998/0401		if(ctl->isintr && v != VectorTIMER && v != VectorCLOCK)
1998/0512		if(up && up->state == Running) if(anyhigher()) if(!active.exiting)
1998/0516		if(up->preempted == 0) if(!active.exiting){ up->preempted = 1;
1998/0512		sched();
1998/0516		splhi(); up->preempted = 0; }
1991/0731		}
1997/0327		else if(v <= 16 && user){ spllo();