hotspot/src/share/vm/gc_implementation/shared/isGCActiveMark.hpp

/*
 * Copyright 2002 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 *
 */

// 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;
  }
};