1 /*
   2  * Copyright (c) 2018, Red Hat, Inc. and/or its affiliates.
   3  *
   4  * This code is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License version 2 only, as
   6  * published by the Free Software Foundation.
   7  *
   8  * This code is distributed in the hope that it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  11  * version 2 for more details (a copy is included in the LICENSE file that
  12  * accompanied this code).
  13  *
  14  * You should have received a copy of the GNU General Public License version
  15  * 2 along with this work; if not, write to the Free Software Foundation,
  16  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  17  *
  18  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  19  * or visit www.oracle.com if you need additional information or have any
  20  * questions.
  21  *
  22  */
  23 
  24 #ifndef SHARE_VM_GC_SHENANDOAH_SHENANDOAHARRAYCOPYTASKQUEUE_HPP
  25 #define SHARE_VM_GC_SHENANDOAH_SHENANDOAHARRAYCOPYTASKQUEUE_HPP
  26 
  27 #include "utilities/growableArray.hpp"
  28 
  29 class HeapWord;
  30 class Mutex;
  31 
  32 class ShenandoahArrayCopyTask {
  33 private:
  34   // For clone this is actually an oop, and _count == 0.
  35   // For arraycopy, this is the start of range, and _count is the number of elements.
  36   // Converst to oop* or narrowOop* as appropriate.
  37   HeapWord* _start;
  38 
  39   // For arraycopy, this is the number of elements. For clone, this == 0.
  40   size_t _count;
  41 
  42 public:
  43   ShenandoahArrayCopyTask() :
  44     _start(NULL), _count(0) {}
  45 
  46   ShenandoahArrayCopyTask(const ShenandoahArrayCopyTask& o) :
  47     _start(o._start), _count(o._count) {}
  48 
  49   ShenandoahArrayCopyTask(HeapWord* start) :
  50     _start(start), _count(0) {}
  51 
  52   ShenandoahArrayCopyTask(HeapWord* start, size_t count) :
  53     _start(start), _count(count) {}
  54 
  55   HeapWord* start() { return _start; }
  56   size_t    count() { return _count; }
  57 
  58 };
  59 
  60 class ShenandoahArrayCopyTaskQueue {
  61 private:
  62   GrowableArray<ShenandoahArrayCopyTask>* _buffer;
  63   Mutex* _lock;
  64 
  65 public:
  66   ShenandoahArrayCopyTaskQueue();
  67 
  68   ~ShenandoahArrayCopyTaskQueue();
  69 
  70   void push(HeapWord* obj);
  71   void push(HeapWord* start, size_t count);
  72   ShenandoahArrayCopyTask pop();
  73   size_t length() const;
  74   void clear();
  75 };
  76 
  77 #endif // SHARE_VM_GC_SHENANDOAH_SHENANDOAHARRAYCOPYTASKQUEUE_HPP