1 /*
 2  * Copyright (c) 2014, 2022, 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
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24  */
25 
26 package jdk.internal.access;
27 
28 import java.lang.ref.ReferenceQueue;
29 
30 public interface JavaLangRefAccess {
31 
32     /**
33      * Starts the Finalizer and Reference Handler threads.
34      */
35     void startThreads();
36 
37     /**
38      * Wait for progress in {@link java.lang.ref.Reference}
39      * processing.  If there aren't any pending {@link
40      * java.lang.ref.Reference}s, return immediately.
41      *
42      * @return {@code true} if there were any pending
43      * {@link java.lang.ref.Reference}s, {@code false} otherwise.
44      */
45     boolean waitForReferenceProcessing() throws InterruptedException;
46 
47     /**
48      * Runs the finalization methods of any objects pending finalization.
49      *
50      * Invoked by Runtime.runFinalization()
51      */
52     void runFinalization();
53 }