409   // vm thread. It collects the heap assuming that the

   409   // vm thread. It collects the heap assuming that the

   410   // heap lock is already held and that we are executing in

   410   // heap lock is already held and that we are executing in

   411   // the context of the vm thread.

   411   // the context of the vm thread.

   412   virtual void collect_as_vm_thread(GCCause::Cause cause);

   412   virtual void collect_as_vm_thread(GCCause::Cause cause);

   413 

   413 

   414   // Returns the barrier set for this heap

   418   // Returns the barrier set for this heap

   415   BarrierSet* barrier_set() { return _barrier_set; }

   419   BarrierSet* barrier_set() { return _barrier_set; }

   416   void set_barrier_set(BarrierSet* barrier_set);

   420   void set_barrier_set(BarrierSet* barrier_set);

   417 

   421 

   418   // Returns "true" iff there is a stop-world GC in progress.  (I assume

   422   // Returns "true" iff there is a stop-world GC in progress.  (I assume