/*

 * Copyright (c) 2002, 2015, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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 */

#ifndef SHARE_VM_GC_SHARED_ISGCACTIVEMARK_HPP

#define SHARE_VM_GC_SHARED_ISGCACTIVEMARK_HPP

#include "gc/shared/collectedHeap.hpp"

#include "memory/allocation.hpp"

#include "memory/universe.hpp"

#include "utilities/debug.hpp"

// This class provides a method for block structured setting of the

// _is_gc_active state without requiring accessors in CollectedHeap

class IsGCActiveMark : public StackObj {

 public:

  IsGCActiveMark() {

    CollectedHeap* heap = Universe::heap();

    assert(!heap->is_gc_active(), "Not reentrant");

    heap->_is_gc_active = true;

  }

  ~IsGCActiveMark() {

    CollectedHeap* heap = Universe::heap();

    assert(heap->is_gc_active(), "Sanity");

    heap->_is_gc_active = false;

  }

};

#endif // SHARE_VM_GC_SHARED_ISGCACTIVEMARK_HPP