diff -r 000000000000 -r 212417b74b72 rt/emul/compact/src/main/java/java/util/concurrent/locks/AbstractOwnableSynchronizer.java
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/rt/emul/compact/src/main/java/java/util/concurrent/locks/AbstractOwnableSynchronizer.java Sat Mar 19 10:46:31 2016 +0100
@@ -0,0 +1,86 @@
+/*
+ * 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.
+ */
+
+/*
+ * This file is available under and governed by the GNU General Public
+ * License version 2 only, as published by the Free Software Foundation.
+ * However, the following notice accompanied the original version of this
+ * file:
+ *
+ * Written by Doug Lea with assistance from members of JCP JSR-166
+ * Expert Group and released to the public domain, as explained at
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+package java.util.concurrent.locks;
+
+/**
+ * A synchronizer that may be exclusively owned by a thread. This
+ * class provides a basis for creating locks and related synchronizers
+ * that may entail a notion of ownership. The
+ * AbstractOwnableSynchronizer class itself does not manage or
+ * use this information. However, subclasses and tools may use
+ * appropriately maintained values to help control and monitor access
+ * and provide diagnostics.
+ *
+ * @since 1.6
+ * @author Doug Lea
+ */
+public abstract class AbstractOwnableSynchronizer
+ implements java.io.Serializable {
+
+ /** Use serial ID even though all fields transient. */
+ private static final long serialVersionUID = 3737899427754241961L;
+
+ /**
+ * Empty constructor for use by subclasses.
+ */
+ protected AbstractOwnableSynchronizer() { }
+
+ /**
+ * The current owner of exclusive mode synchronization.
+ */
+ private transient Thread exclusiveOwnerThread;
+
+ /**
+ * Sets the thread that currently owns exclusive access. A
+ * null argument indicates that no thread owns access.
+ * This method does not otherwise impose any synchronization or
+ * volatile field accesses.
+ */
+ protected final void setExclusiveOwnerThread(Thread t) {
+ exclusiveOwnerThread = t;
+ }
+
+ /**
+ * Returns the thread last set by
+ * setExclusiveOwnerThread, or null if never
+ * set. This method does not otherwise impose any synchronization
+ * or volatile field accesses.
+ * @return the owner thread
+ */
+ protected final Thread getExclusiveOwnerThread() {
+ return exclusiveOwnerThread;
+ }
+}