/*
* BUG:
* The AC must not accept interrupts while in the kernel,
* or we must be prepared for nesting them, which we are not.
* This is important for note handling, because postnote()
* assumes that it's ok to send an IPI to an AC, no matter its
* state. The /proc interface also assumes that.
*
*/
void
intrac(Proc *p)
{
Mach *ac;
ac = p->ac;
if(ac == nil){
DBG("intrac: Proc.ac is nil. no ipi sent.\n");
return;
}
/*
* It's ok if the AC gets idle in the mean time.
*/
DBG("intrac: ipi to cpu%d\n", ac->machno);
apicipi(ac->apicno);
}
static void
waitnotstale(Mach *mp, PmcCtr *p)
{
PmcWait *w;
w = newpmcw();
w->next = p->wq;
p->wq = w;
incref(w);
iunlock(&mp->pmclock);
apicipi(mp->apicno);
if(waserror()){
pmcwclose(w);
nexterror();
}
sleep(&w->r, notstale, p);
poperror();
pmcwclose(w);
}
