1 /*
   2  * Copyright (c) 1997, 2008, 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.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package java.lang.ref;
  27 
  28 import java.security.PrivilegedAction;
  29 import java.security.AccessController;
  30 
  31 
  32 final class Finalizer extends FinalReference { /* Package-private; must be in
  33                                                   same package as the Reference
  34                                                   class */
  35 
  36     /* A native method that invokes an arbitrary object's finalize method is
  37        required since the finalize method is protected
  38      */
  39     static native void invokeFinalizeMethod(Object o) throws Throwable;
  40 
  41     private static ReferenceQueue queue = new ReferenceQueue();
  42     private static Finalizer unfinalized = null;
  43     private static final Object lock = new Object();
  44 
  45     private Finalizer
  46         next = null,
  47         prev = null;
  48 
  49     private boolean hasBeenFinalized() {
  50         return (next == this);
  51     }
  52 
  53     private void add() {
  54         synchronized (lock) {
  55             if (unfinalized != null) {
  56                 this.next = unfinalized;
  57                 unfinalized.prev = this;
  58             }
  59             unfinalized = this;
  60         }
  61     }

   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.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package java.lang.ref;
  27 
  28 import java.security.PrivilegedAction;
  29 import java.security.AccessController;
  30 
  31 
  32 final class Finalizer extends FinalReference<Object> { /* Package-private; must be in
  33                                                         same package as the Reference
  34                                                         class */
  35 
  36     /* A native method that invokes an arbitrary object's finalize method is
  37        required since the finalize method is protected
  38      */
  39     static native void invokeFinalizeMethod(Object o) throws Throwable;
  40 
  41     private static ReferenceQueue<Object> queue = new ReferenceQueue<>();
  42     private static Finalizer unfinalized = null;
  43     private static final Object lock = new Object();
  44 
  45     private Finalizer
  46         next = null,
  47         prev = null;
  48 
  49     private boolean hasBeenFinalized() {
  50         return (next == this);
  51     }
  52 
  53     private void add() {
  54         synchronized (lock) {
  55             if (unfinalized != null) {
  56                 this.next = unfinalized;
  57                 unfinalized.prev = this;
  58             }
  59             unfinalized = this;
  60         }
  61     }