1 /*
   2  * Copyright (c) 2001, 2008, 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
  21  * questions.
  22  *
  23  */
  24 
  25 # include "incls/_precompiled.incl"
  26 # include "incls/_freeList.cpp.incl"





  27 
  28 // Free list.  A FreeList is used to access a linked list of chunks
  29 // of space in the heap.  The head and tail are maintained so that
  30 // items can be (as in the current implementation) added at the
  31 // at the tail of the list and removed from the head of the list to
  32 // maintain a FIFO queue.
  33 
  34 FreeList::FreeList() :
  35   _head(NULL), _tail(NULL)
  36 #ifdef ASSERT
  37   , _protecting_lock(NULL)
  38 #endif
  39 {
  40   _size         = 0;
  41   _count        = 0;
  42   _hint         = 0;
  43   init_statistics();
  44 }
  45 
  46 FreeList::FreeList(FreeChunk* fc) :

   1 /*
   2  * Copyright (c) 2001, 2010, 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
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "gc_implementation/concurrentMarkSweep/freeBlockDictionary.hpp"
  27 #include "gc_implementation/concurrentMarkSweep/freeList.hpp"
  28 #include "memory/sharedHeap.hpp"
  29 #include "runtime/globals.hpp"
  30 #include "runtime/mutex.hpp"
  31 #include "runtime/vmThread.hpp"
  32 
  33 // Free list.  A FreeList is used to access a linked list of chunks
  34 // of space in the heap.  The head and tail are maintained so that
  35 // items can be (as in the current implementation) added at the
  36 // at the tail of the list and removed from the head of the list to
  37 // maintain a FIFO queue.
  38 
  39 FreeList::FreeList() :
  40   _head(NULL), _tail(NULL)
  41 #ifdef ASSERT
  42   , _protecting_lock(NULL)
  43 #endif
  44 {
  45   _size         = 0;
  46   _count        = 0;
  47   _hint         = 0;
  48   init_statistics();
  49 }
  50 
  51 FreeList::FreeList(FreeChunk* fc) :