view src/hotspot/share/gc/shared/isGCActiveMark.hpp @ 52321:31b159f30fb2

8180193: Make marking bitmap code available to other GCs Reviewed-by: shade, stefank
author rkennke
date Wed, 29 Aug 2018 20:15:09 +0200
parents 0d139bc2a24a
children 9807daeb47c4
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/*
 * 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
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 *
 */

#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