diff -r c82e388e17c5 -r 5c343868d071 hotspot/src/share/vm/oops/constantPoolOop.hpp
--- a/hotspot/src/share/vm/oops/constantPoolOop.hpp	Tue Jan 06 07:05:05 2009 -0800
+++ b/hotspot/src/share/vm/oops/constantPoolOop.hpp	Sun Jan 11 16:58:24 2009 -0800
@@ -43,6 +43,8 @@
   klassOop             _pool_holder;   // the corresponding class
   int                  _flags;         // a few header bits to describe contents for GC
   int                  _length; // number of elements in the array
+  volatile bool        _is_conc_safe; // if true, safe for concurrent
+                                      // GC processing
   // only set to non-zero if constant pool is merged by RedefineClasses
   int                  _orig_length;
 
@@ -379,6 +381,9 @@
   static int object_size(int length)   { return align_object_size(header_size() + length); }
   int object_size()                    { return object_size(length()); }
 
+  bool is_conc_safe()                  { return _is_conc_safe; }
+  void set_is_conc_safe(bool v)        { _is_conc_safe = v; }
+
   friend class constantPoolKlass;
   friend class ClassFileParser;
   friend class SystemDictionary;