it's not very intelligent to scan a null stack

git-svn-id: http://svn.macosforge.org/repository/ruby/MacRuby/trunk@650 23306eb0-4c56-4727-a40e-e92c0eb68959
cyberfox · Oct 7, 2008 · e26f03f · e26f03f
1 parent 7e3cb61
commit e26f03f
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/gc.c b/gc.c
@@ -439,7 +439,9 @@ static void
 rb_objc_scan_external_callout(void *context, void (*scanner)(void *context, void *start, void *end))
 {
     rb_thread_t *th = GET_THREAD();
-    (*scanner)(context, th->stack, th->cfp->sp);
+    if (th->stack != NULL) {
+	(*scanner)(context, th->stack, th->cfp->sp);
+    }
 } 
 
 NODE*