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 /*

  * Copyright (c) 2001, 2010, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARKTHREAD_HPP

 #define SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARKTHREAD_HPP

 #include "gc_implementation/shared/concurrentGCThread.hpp"

 // 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;

   volatile bool                    _started;

   volatile 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_on(outputStream* st) const;

   void print() const;

   // 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()       { assert(!_in_progress, "cycle in progress"); _started = true;  }

   void clear_started()     { assert(_in_progress, "must be starting a cycle"); _started = false; }

   bool started()           { return _started;  }

   void set_in_progress()   { assert(_started, "must be starting a cycle"); _in_progress = true;  }

   void clear_in_progress() { assert(!_started, "must not be starting a new cycle"); _in_progress = false; }

   bool in_progress()       { return _in_progress;  }

   // This flag returns true from the moment a marking cycle is

   // initiated (during the initial-mark pause when started() is set)

   // to the moment when the cycle completes (just after the next

   // marking bitmap has been cleared and in_progress() is

   // cleared). While this flag is true we will not start another cycle

   // so that cycles do not overlap. We cannot use just in_progress()

   // as the CM thread might take some time to wake up before noticing

   // that started() is set and set in_progress().

   bool during_cycle()      { return started() || in_progress(); }

   // Yield for GC

   void            yield();

   // shutdown

   void stop();

 };

 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARKTHREAD_HPP