1 /*
   2  * Copyright (c) 2002, 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
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  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_GC_IMPLEMENTATION_SHARED_ISGCACTIVEMARK_HPP
  26 #define SHARE_VM_GC_IMPLEMENTATION_SHARED_ISGCACTIVEMARK_HPP
  27 
  28 #ifndef SERIALGC
  29 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
  30 #endif
  31 
  32 // This class provides a method for block structured setting of the
  33 // _is_gc_active state without requiring accessors in CollectedHeap
  34 
  35 class IsGCActiveMark : public StackObj {
  36  public:
  37   IsGCActiveMark() {
  38     CollectedHeap* heap = Universe::heap();
  39     assert(!heap->is_gc_active(), "Not reentrant");
  40     heap->_is_gc_active = true;
  41   }
  42 
  43   ~IsGCActiveMark() {
  44     CollectedHeap* heap = Universe::heap();
  45     assert(heap->is_gc_active(), "Sanity");
  46     heap->_is_gc_active = false;
  47   }
  48 };
  49 
  50 #endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_ISGCACTIVEMARK_HPP