1 /*

     2  * Copyright 2002 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any questions.

    22  *

    23  */

    24 

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

    26 // _is_gc_active state without requiring accessors in CollectedHeap

    27 

    28 class IsGCActiveMark : public StackObj {

    29  public:

    30   IsGCActiveMark() {

    31     CollectedHeap* heap = Universe::heap();

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

    33     heap->_is_gc_active = true;

    34   }

    35 

    36   ~IsGCActiveMark() {

    37     CollectedHeap* heap = Universe::heap();

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

    39     heap->_is_gc_active = false;

    40   }

    41 };