--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/gc_implementation/g1/concurrentG1RefineThread.hpp	Thu Jun 05 15:57:56 2008 -0700
@@ -0,0 +1,104 @@
+/*
+ * Copyright 2001-2007 Sun Microsystems, Inc.  All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+// Forward Decl.
+class ConcurrentG1Refine;
+
+// The G1 Concurrent Refinement Thread (could be several in the future).
+
+class ConcurrentG1RefineThread: public ConcurrentGCThread {
+  friend class VMStructs;
+  friend class G1CollectedHeap;
+
+  double _vtime_start;  // Initial virtual time.
+  double _vtime_accum;  // Initial virtual time.
+
+ public:
+  virtual void run();
+
+ private:
+  ConcurrentG1Refine*              _cg1r;
+  bool                             _started;
+  bool                             _in_progress;
+  volatile bool                    _restart;
+
+  COTracker                        _co_tracker;
+  double                           _interval_ms;
+
+  bool                             _do_traversal;
+
+  void decreaseInterval(int processing_time_ms) {
+    double min_interval_ms = (double) processing_time_ms;
+    _interval_ms = 0.8 * _interval_ms;
+    if (_interval_ms < min_interval_ms)
+      _interval_ms = min_interval_ms;
+  }
+  void increaseInterval(int processing_time_ms) {
+    double max_interval_ms = 9.0 * (double) processing_time_ms;
+    _interval_ms = 1.1 * _interval_ms;
+    if (max_interval_ms > 0 && _interval_ms > max_interval_ms)
+      _interval_ms = max_interval_ms;
+  }
+
+  void sleepBeforeNextCycle();
+
+  void traversalBasedRefinement();
+
+  void queueBasedRefinement();
+
+  // For use by G1CollectedHeap, which is a friend.
+  static SuspendibleThreadSet* sts() { return &_sts; }
+
+ public:
+  // Constructor
+  ConcurrentG1RefineThread(ConcurrentG1Refine* cg1r);
+
+  // Printing
+  void print();
+
+  // Total virtual time so far.
+  double vtime_accum() { return _vtime_accum; }
+
+  ConcurrentG1Refine* cg1r()                     { return _cg1r;     }
+
+
+  void            set_started()                  { _started = true;   }
+  void            clear_started()                { _started = false;  }
+  bool            started()                      { return _started;   }
+
+  void            set_in_progress()              { _in_progress = true;   }
+  void            clear_in_progress()            { _in_progress = false;  }
+  bool            in_progress()                  { return _in_progress;   }
+
+  void            set_do_traversal(bool b);
+  bool            do_traversal() { return _do_traversal; }
+
+  void            sample_young_list_rs_lengths();
+
+  // Yield for GC
+  void            yield();
+
+  // shutdown
+  static void stop();
+};