hotspot/src/share/vm/gc_implementation/g1/concurrentMarkThread.hpp
author jwilhelm
Thu, 03 Oct 2013 21:36:29 +0200
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8025852: Remove unnecessary setters in collector policy classes Summary: Use instance variables directly within the collector policy classes and remove unused setters. Reviewed-by: tschatzl, jcoomes
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/*
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 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#ifndef SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARKTHREAD_HPP
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#define SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARKTHREAD_HPP
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#include "gc_implementation/shared/concurrentGCThread.hpp"
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// The Concurrent Mark GC Thread (could be several in the future).
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// This is copied from the Concurrent Mark Sweep GC Thread
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// Still under construction.
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class ConcurrentMark;
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class ConcurrentMarkThread: public ConcurrentGCThread {
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  friend class VMStructs;
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  double _vtime_start;  // Initial virtual time.
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  double _vtime_accum;  // Accumulated virtual time.
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  double _vtime_mark_accum;
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 public:
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  virtual void run();
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 private:
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  ConcurrentMark*                  _cm;
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  volatile bool                    _started;
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  volatile bool                    _in_progress;
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  void sleepBeforeNextCycle();
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  static SurrogateLockerThread*         _slt;
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 public:
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  // Constructor
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  ConcurrentMarkThread(ConcurrentMark* cm);
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  static void makeSurrogateLockerThread(TRAPS);
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  static SurrogateLockerThread* slt() { return _slt; }
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  // Printing
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  void print_on(outputStream* st) const;
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  void print() const;
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  // Total virtual time so far.
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  double vtime_accum();
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  // Marking virtual time so far
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  double vtime_mark_accum();
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  ConcurrentMark* cm()     { return _cm; }
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  void set_started()       { assert(!_in_progress, "cycle in progress"); _started = true;  }
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  void clear_started()     { assert(_in_progress, "must be starting a cycle"); _started = false; }
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  bool started()           { return _started;  }
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  void set_in_progress()   { assert(_started, "must be starting a cycle"); _in_progress = true;  }
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  void clear_in_progress() { assert(!_started, "must not be starting a new cycle"); _in_progress = false; }
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  bool in_progress()       { return _in_progress;  }
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  // This flag returns true from the moment a marking cycle is
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  // initiated (during the initial-mark pause when started() is set)
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  // to the moment when the cycle completes (just after the next
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  // marking bitmap has been cleared and in_progress() is
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  // cleared). While this flag is true we will not start another cycle
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  // so that cycles do not overlap. We cannot use just in_progress()
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  // as the CM thread might take some time to wake up before noticing
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  // that started() is set and set in_progress().
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  bool during_cycle()      { return started() || in_progress(); }
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  // Yield for GC
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  void            yield();
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  // shutdown
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  void stop();
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};
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#endif // SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARKTHREAD_HPP