Merge pull request #9 from tajila/origin

Add stub implementation of NativeReferenceQueue

closed/src/java.base/share/classes/java/lang/ref/NativeReferenceQueue.java

@@ -0,0 +1,42 @@
+/*
+ * Copyright (c) 2021, 2022, Oracle and/or its affiliates. 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.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+/*
+ * ===========================================================================
+ * (c) Copyright IBM Corp. 2022, 2022 All Rights Reserved
+ * ===========================================================================
+ */
+package java.lang.ref;
+
+/**
+ * An implementation of a ReferenceQueue that uses native monitors.
+ * The use of java.util.concurrent.lock locks interacts with various mechanisms,
+ * such as virtual threads and ForkJoinPool, that might not be appropriate for some
+ * low-level mechanisms, in particular MethodType's weak intern set.
+ */
+final class NativeReferenceQueue<T> extends ReferenceQueue<T> {
+	public NativeReferenceQueue() {
+		super(0);
+	}
+}