--- a/hotspot/src/share/vm/memory/gcLocker.hpp Wed Jun 10 14:57:21 2009 -0700
+++ b/hotspot/src/share/vm/memory/gcLocker.hpp Thu Jun 11 12:40:00 2009 -0700
@@ -242,6 +242,31 @@
#endif
};
+// A SkipGCALot object is used to elide the usual effect of gc-a-lot
+// over a section of execution by a thread. Currently, it's used only to
+// prevent re-entrant calls to GC.
+class SkipGCALot : public StackObj {
+ private:
+ bool _saved;
+ Thread* _t;
+
+ public:
+#ifdef ASSERT
+ SkipGCALot(Thread* t) : _t(t) {
+ _saved = _t->skip_gcalot();
+ _t->set_skip_gcalot(true);
+ }
+
+ ~SkipGCALot() {
+ assert(_t->skip_gcalot(), "Save-restore protocol invariant");
+ _t->set_skip_gcalot(_saved);
+ }
+#else
+ SkipGCALot(Thread* t) { }
+ ~SkipGCALot() { }
+#endif
+};
+
// JRT_LEAF currently can be called from either _thread_in_Java or
// _thread_in_native mode. In _thread_in_native, it is ok
// for another thread to trigger GC. The rest of the JRT_LEAF