diff a/src/hotspot/share/gc/g1/g1ConcurrentMark.hpp b/src/hotspot/share/gc/g1/g1ConcurrentMark.hpp
--- a/src/hotspot/share/gc/g1/g1ConcurrentMark.hpp
+++ b/src/hotspot/share/gc/g1/g1ConcurrentMark.hpp
@@ -601,10 +601,12 @@
   size_t mark_stack_size() const                { return _global_mark_stack.size(); }
   size_t partial_mark_stack_size_target() const { return _global_mark_stack.capacity() / 3; }
   bool mark_stack_empty() const                 { return _global_mark_stack.is_empty(); }
 
   void concurrent_cycle_start();
+  bool shutdown_cleanup_needed() const;
+  void shutdown_concurrent_cycle();
   // Abandon current marking iteration due to a Full GC.
   bool concurrent_cycle_abort();
   void concurrent_cycle_end(bool mark_cycle_completed);
 
   // Notifies marking threads to abort. This is a best-effort notification. Does not