jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/g1/concurrentMarkThread.hpp@595c0f60d50d

8029075: String deduplication in G1
Summary: Implementation of JEP 192, http://openjdk.java.net/jeps/192
Reviewed-by: brutisso, tschatzl, coleenp

     1 /*

     2  * Copyright (c) 2001, 2012, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

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    23  */

    25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARKTHREAD_HPP

    26 #define SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARKTHREAD_HPP

    28 #include "gc_implementation/shared/concurrentGCThread.hpp"

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

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

    32 // Still under construction.

    34 class ConcurrentMark;

    36 class ConcurrentMarkThread: public ConcurrentGCThread {

    37   friend class VMStructs;

    39   double _vtime_start;  // Initial virtual time.

    40   double _vtime_accum;  // Accumulated virtual time.

    42   double _vtime_mark_accum;

    44  public:

    45   virtual void run();

    47  private:

    48   ConcurrentMark*                  _cm;

    49   volatile bool                    _started;

    50   volatile bool                    _in_progress;

    52   void sleepBeforeNextCycle();

    54   static SurrogateLockerThread*         _slt;

    56  public:

    57   // Constructor

    58   ConcurrentMarkThread(ConcurrentMark* cm);

    60   static void makeSurrogateLockerThread(TRAPS);

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

    63   // Printing

    64   void print_on(outputStream* st) const;

    65   void print() const;

    67   // Total virtual time so far.

    68   double vtime_accum();

    69   // Marking virtual time so far

    70   double vtime_mark_accum();

    72   ConcurrentMark* cm()     { return _cm; }

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

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

    76   bool started()           { return _started;  }

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

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

    80   bool in_progress()       { return _in_progress;  }

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

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

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

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

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

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

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

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

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

    92   // Yield for GC

    93   void            yield();

    95   // shutdown

    96   void stop();

    97 };

    99 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARKTHREAD_HPP

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