1 /*
2 * Copyright (c) 1997, 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
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_OOPS_INSTANCEREFKLASS_HPP
26 #define SHARE_VM_OOPS_INSTANCEREFKLASS_HPP
27
28 #include "memory/specialized_oop_closures.hpp"
29 #include "oops/instanceKlass.hpp"
30 #include "utilities/macros.hpp"
31
32 // An InstanceRefKlass is a specialized InstanceKlass for Java
33 // classes that are subclasses of java/lang/ref/Reference.
34 //
35 // These classes are used to implement soft/weak/final/phantom
36 // references and finalization, and need special treatment by the
37 // garbage collector.
38 //
39 // During GC discovered reference objects are added (chained) to one
40 // of the four lists below, depending on the type of reference.
41 // The linked occurs through the next field in class java/lang/ref/Reference.
42 //
43 // Afterwards, the discovered references are processed in decreasing
44 // order of reachability. Reference objects eligible for notification
45 // are linked to the static pending_list in class java/lang/ref/Reference,
46 // and the pending list lock object in the same class is notified.
47
48
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1 /*
2 * Copyright (c) 1997, 2015, 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
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_OOPS_INSTANCEREFKLASS_HPP
26 #define SHARE_VM_OOPS_INSTANCEREFKLASS_HPP
27
28 #include "gc/shared/specialized_oop_closures.hpp"
29 #include "oops/instanceKlass.hpp"
30 #include "utilities/macros.hpp"
31
32 // An InstanceRefKlass is a specialized InstanceKlass for Java
33 // classes that are subclasses of java/lang/ref/Reference.
34 //
35 // These classes are used to implement soft/weak/final/phantom
36 // references and finalization, and need special treatment by the
37 // garbage collector.
38 //
39 // During GC discovered reference objects are added (chained) to one
40 // of the four lists below, depending on the type of reference.
41 // The linked occurs through the next field in class java/lang/ref/Reference.
42 //
43 // Afterwards, the discovered references are processed in decreasing
44 // order of reachability. Reference objects eligible for notification
45 // are linked to the static pending_list in class java/lang/ref/Reference,
46 // and the pending list lock object in the same class is notified.
47
48
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