--- old/src/hotspot/share/gc/shenandoah/shenandoahHeap.hpp	2020-04-27 10:20:18.195876531 +0200
+++ new/src/hotspot/share/gc/shenandoah/shenandoahHeap.hpp	2020-04-27 10:20:18.011873536 +0200
@@ -616,6 +616,10 @@
   void ensure_parsability(bool retire_tlabs);
   void make_parsable(bool retire_tlabs);
 
+  // Runs the given AbstractGangTask with the current active workers.
+  // Returns the total time to run the task.
+  virtual void run_task(AbstractGangTask* task);
+
 // ---------- Marking support
 //
 private: