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how much stack do we need?

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rsc 2004-04-21 22:47:15 +00:00
parent 2b4b2ae191
commit fb36ed82ec
1 changed files with 16 additions and 4 deletions
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20
src/libthread/sched.c
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@ -156,6 +156,21 @@ relock:
return t;
}
void
needstack(int howmuch)
{
Proc *p;
Thread *t;
p = _threadgetproc();
if(p == nil || (t=p->thread) == nil)
return;
if((ulong)&howmuch < (ulong)t->stk+howmuch){ /* stack overflow waiting to happen */
fprint(2, "stack overflow: stack at 0x%lux, limit at 0x%lux, need 0x%lux\n", (ulong)&p, (ulong)t->stk, howmuch);
abort();
}
}
void
_sched(void)
{
@ -166,10 +181,7 @@ Resched:
p = _threadgetproc();
//fprint(2, "p %p\n", p);
if((t = p->thread) != nil){
if((ulong)&p < (ulong)t->stk+512){ /* stack overflow waiting to happen */
fprint(2, "stack overflow: stack at %lux, limit at %lux\n", (ulong)&p, (ulong)t->stk);
abort();
}
needstack(512);
// _threaddebug(DBGSCHED, "pausing, state=%s set %p goto %p",
// psstate(t->state), &t->sched, &p->sched);
if(_setlabel(&t->sched)==0)