thow much stack do we need? - plan9port - [fork] Plan 9 from user space

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---

commit fb36ed82ec7470efe4e334ddc054bcb4fa06ae9e

parent 2b4b2ae19107f2c7e45ca6ab6f73c9c8a5fb84dd

Author: rsc 

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(-)
---

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)