src/share/vm/runtime/vm_operations.hpp

rev 13387 : [mq]: parallel_sp_cleaning.patch

*** 196,205 ****
--- 196,225 ----
             evaluation_mode() == _async_safepoint;
    }
  
    static const char* mode_to_string(Mode mode);
  
+   // Safepoint cleanup
+   // Return true if this VM_Operation takes care of idle monitor deflation.
+   // Idle monitor deflation is usually done by the safepoint cleanup phase
+   // in SafepointSynchronize::do_cleanup_tasks(). However, a VM_Operation
+   // may want to take care of this itself, for example if a GC operation
+   // scans the thread stack anyway, it probably can piggy-back monitor
+   // deflation. Note that this is only possible if the oop marks are preserved
+   // during the VM operation (for example, most current GCs *don't* preserve
+   // the mark word, but displace it and temporarily use the mark word as
+   // forwarding pointer).
+   virtual bool deflates_idle_monitors() { return false; }
+ 
+   // Return true if this VM_Operation takes care of nmethod marking.
+   // NMethod marking is usually done by the safepoint cleanup phase
+   // in SafepointSynchronize::do_cleanup_tasks(). However, a VM_Operation
+   // may want to take care of this itself, for example if a GC operation
+   // scans the thread stack anyway, it can just as well piggy-back nmethod
+   // marking.
+   virtual bool marks_nmethods() { return false; }
+ 
    // Debugging
    virtual void print_on_error(outputStream* st) const;
    const char* name() const { return _names[type()]; }
    static const char* name(int type) {
      assert(type >= 0 && type < VMOp_Terminating, "invalid VM operation type");