1 /*
   2  * Copyright (c) 2002, 2013, 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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  24 
  25 #ifndef SHARE_VM_GC_IMPLEMENTATION_SHARED_ISGCACTIVEMARK_HPP
  26 #define SHARE_VM_GC_IMPLEMENTATION_SHARED_ISGCACTIVEMARK_HPP
  27 
  28 #include "utilities/macros.hpp"
  29 #if INCLUDE_ALL_GCS
  30 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
  31 #endif // INCLUDE_ALL_GCS
  32 
  33 // This class provides a method for block structured setting of the
  34 // _is_gc_active state without requiring accessors in CollectedHeap
  35 
  36 class IsGCActiveMark : public StackObj {
  37  public:
  38   IsGCActiveMark() {
  39     CollectedHeap* heap = Universe::heap();
  40     assert(!heap->is_gc_active(), "Not reentrant");
  41     heap->_is_gc_active = true;
  42   }
  43 
  44   ~IsGCActiveMark() {
  45     CollectedHeap* heap = Universe::heap();
  46     assert(heap->is_gc_active(), "Sanity");
  47     heap->_is_gc_active = false;
  48   }
  49 };
  50 
  51 #endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_ISGCACTIVEMARK_HPP