ysr@777: /*
johnc@3463:  * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved.
ysr@777:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
ysr@777:  *
ysr@777:  * This code is free software; you can redistribute it and/or modify it
ysr@777:  * under the terms of the GNU General Public License version 2 only, as
ysr@777:  * published by the Free Software Foundation.
ysr@777:  *
ysr@777:  * This code is distributed in the hope that it will be useful, but WITHOUT
ysr@777:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
ysr@777:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
ysr@777:  * version 2 for more details (a copy is included in the LICENSE file that
ysr@777:  * accompanied this code).
ysr@777:  *
ysr@777:  * You should have received a copy of the GNU General Public License version
ysr@777:  * 2 along with this work; if not, write to the Free Software Foundation,
ysr@777:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
ysr@777:  *
trims@1907:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907:  * or visit www.oracle.com if you need additional information or have any
trims@1907:  * questions.
ysr@777:  *
ysr@777:  */
ysr@777: 
stefank@2314: #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARKTHREAD_HPP
stefank@2314: #define SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARKTHREAD_HPP
stefank@2314: 
stefank@2314: #include "gc_implementation/shared/concurrentGCThread.hpp"
stefank@2314: 
ysr@777: // The Concurrent Mark GC Thread (could be several in the future).
ysr@777: // This is copied from the Concurrent Mark Sweep GC Thread
ysr@777: // Still under construction.
ysr@777: 
ysr@777: class ConcurrentMark;
ysr@777: 
ysr@777: class ConcurrentMarkThread: public ConcurrentGCThread {
ysr@777:   friend class VMStructs;
ysr@777: 
ysr@777:   double _vtime_start;  // Initial virtual time.
ysr@777:   double _vtime_accum;  // Accumulated virtual time.
ysr@777: 
ysr@777:   double _vtime_mark_accum;
ysr@777: 
ysr@777:  public:
ysr@777:   virtual void run();
ysr@777: 
ysr@777:  private:
ysr@777:   ConcurrentMark*                  _cm;
tonyp@1794:   volatile bool                    _started;
tonyp@1794:   volatile bool                    _in_progress;
ysr@777: 
ysr@777:   void sleepBeforeNextCycle();
ysr@777: 
ysr@777:   static SurrogateLockerThread*         _slt;
ysr@777: 
ysr@777:  public:
ysr@777:   // Constructor
ysr@777:   ConcurrentMarkThread(ConcurrentMark* cm);
ysr@777: 
ysr@777:   static void makeSurrogateLockerThread(TRAPS);
ysr@777:   static SurrogateLockerThread* slt() { return _slt; }
ysr@777: 
ysr@777:   // Printing
tonyp@1454:   void print_on(outputStream* st) const;
tonyp@1454:   void print() const;
ysr@777: 
ysr@777:   // Total virtual time so far.
ysr@777:   double vtime_accum();
ysr@777:   // Marking virtual time so far
ysr@777:   double vtime_mark_accum();
ysr@777: 
tonyp@1794:   ConcurrentMark* cm()     { return _cm; }
ysr@777: 
johnc@2195:   void set_started()       { assert(!_in_progress, "cycle in progress"); _started = true;  }
johnc@2195:   void clear_started()     { assert(_in_progress, "must be starting a cycle"); _started = false; }
tonyp@1794:   bool started()           { return _started;  }
ysr@777: 
johnc@2195:   void set_in_progress()   { assert(_started, "must be starting a cycle"); _in_progress = true;  }
johnc@2195:   void clear_in_progress() { assert(!_started, "must not be starting a new cycle"); _in_progress = false; }
tonyp@1794:   bool in_progress()       { return _in_progress;  }
tonyp@1794: 
tonyp@1794:   // This flag returns true from the moment a marking cycle is
tonyp@1794:   // initiated (during the initial-mark pause when started() is set)
tonyp@1794:   // to the moment when the cycle completes (just after the next
tonyp@1794:   // marking bitmap has been cleared and in_progress() is
tonyp@1794:   // cleared). While this flag is true we will not start another cycle
tonyp@1794:   // so that cycles do not overlap. We cannot use just in_progress()
tonyp@1794:   // as the CM thread might take some time to wake up before noticing
tonyp@1794:   // that started() is set and set in_progress().
tonyp@1794:   bool during_cycle()      { return started() || in_progress(); }
ysr@777: 
ysr@777:   // Yield for GC
ysr@777:   void            yield();
ysr@777: 
ysr@777:   // shutdown
iveresov@1229:   void stop();
ysr@777: };
stefank@2314: 
stefank@2314: #endif // SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARKTHREAD_HPP