thow much stack do we need? - plan9port - [fork] Plan 9 from user space
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---
DIR commit fb36ed82ec7470efe4e334ddc054bcb4fa06ae9e
DIR parent 2b4b2ae19107f2c7e45ca6ab6f73c9c8a5fb84dd
HTML Author: rsc <devnull@localhost>
Date: Wed, 21 Apr 2004 22:47:15 +0000
how much stack do we need?
Diffstat:
M src/libthread/sched.c | 20 ++++++++++++++++----
1 file changed, 16 insertions(+), 4 deletions(-)
---
DIR diff --git a/src/libthread/sched.c b/src/libthread/sched.c
t@@ -157,6 +157,21 @@ relock:
}
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)
{
Proc *p;
t@@ -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)