diff -r 570062d730b2 -r 4c24294029a9 hotspot/src/share/vm/gc_implementation/g1/concurrentMarkThread.hpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/gc_implementation/g1/concurrentMarkThread.hpp	Thu Jun 05 15:57:56 2008 -0700
@@ -0,0 +1,84 @@
+/*
+ * 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.
+ *
+ */
+
+// The Concurrent Mark GC Thread (could be several in the future).
+// This is copied from the Concurrent Mark Sweep GC Thread
+// Still under construction.
+
+class ConcurrentMark;
+
+class ConcurrentMarkThread: public ConcurrentGCThread {
+  friend class VMStructs;
+
+  double _vtime_start;  // Initial virtual time.
+  double _vtime_accum;  // Accumulated virtual time.
+
+  double _vtime_mark_accum;
+  double _vtime_count_accum;
+
+ public:
+  virtual void run();
+
+ private:
+  ConcurrentMark*                  _cm;
+  bool                             _started;
+  bool                             _in_progress;
+
+  void sleepBeforeNextCycle();
+
+  static SurrogateLockerThread*         _slt;
+
+ public:
+  // Constructor
+  ConcurrentMarkThread(ConcurrentMark* cm);
+
+  static void makeSurrogateLockerThread(TRAPS);
+  static SurrogateLockerThread* slt() { return _slt; }
+
+  // Printing
+  void print();
+
+  // Total virtual time so far.
+  double vtime_accum();
+  // Marking virtual time so far
+  double vtime_mark_accum();
+  // Counting virtual time so far.
+  double vtime_count_accum() { return _vtime_count_accum; }
+
+  ConcurrentMark* cm()                           { return _cm;     }
+
+  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;   }
+
+  // Yield for GC
+  void            yield();
+
+  // shutdown
+  static void stop();
+};