1 /*

     2  * Copyright 2001-2007 Sun Microsystems, Inc.  All Rights Reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any questions.

    22  *

    23  */

    24 

    25 // The Concurrent Mark GC Thread (could be several in the future).

    26 // This is copied from the Concurrent Mark Sweep GC Thread

    27 // Still under construction.

    28 

    29 class ConcurrentMark;

    30 

    31 class ConcurrentMarkThread: public ConcurrentGCThread {

    32   friend class VMStructs;

    33 

    34   double _vtime_start;  // Initial virtual time.

    35   double _vtime_accum;  // Accumulated virtual time.

    36 

    37   double _vtime_mark_accum;

    38   double _vtime_count_accum;

    39 

    40  public:

    41   virtual void run();

    42 

    43  private:

    44   ConcurrentMark*                  _cm;

    45   bool                             _started;

    46   bool                             _in_progress;

    47 

    48   void sleepBeforeNextCycle();

    49 

    50   static SurrogateLockerThread*         _slt;

    51 

    52  public:

    53   // Constructor

    54   ConcurrentMarkThread(ConcurrentMark* cm);

    55 

    56   static void makeSurrogateLockerThread(TRAPS);

    57   static SurrogateLockerThread* slt() { return _slt; }

    58 

    59   // Printing

    60   void print();

    61 

    62   // Total virtual time so far.

    63   double vtime_accum();

    64   // Marking virtual time so far

    65   double vtime_mark_accum();

    66   // Counting virtual time so far.

    67   double vtime_count_accum() { return _vtime_count_accum; }

    68 

    69   ConcurrentMark* cm()                           { return _cm;     }

    70 

    71   void            set_started()                  { _started = true;   }

    72   void            clear_started()                { _started = false;  }

    73   bool            started()                      { return _started;   }

    74 

    75   void            set_in_progress()              { _in_progress = true;   }

    76   void            clear_in_progress()            { _in_progress = false;  }

    77   bool            in_progress()                  { return _in_progress;   }

    78 

    79   // Yield for GC

    80   void            yield();

    81 

    82   // shutdown

    83   static void stop();

    84 };