1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/rt/emul/compact/src/main/java/java/util/concurrent/locks/AbstractOwnableSynchronizer.java	Sat Mar 19 10:46:31 2016 +0100
     1.3 @@ -0,0 +1,86 @@
     1.4 +/*
     1.5 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
     1.6 + *
     1.7 + * This code is free software; you can redistribute it and/or modify it
     1.8 + * under the terms of the GNU General Public License version 2 only, as
     1.9 + * published by the Free Software Foundation.  Oracle designates this
    1.10 + * particular file as subject to the "Classpath" exception as provided
    1.11 + * by Oracle in the LICENSE file that accompanied this code.
    1.12 + *
    1.13 + * This code is distributed in the hope that it will be useful, but WITHOUT
    1.14 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    1.15 + * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    1.16 + * version 2 for more details (a copy is included in the LICENSE file that
    1.17 + * accompanied this code).
    1.18 + *
    1.19 + * You should have received a copy of the GNU General Public License version
    1.20 + * 2 along with this work; if not, write to the Free Software Foundation,
    1.21 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
    1.22 + *
    1.23 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
    1.24 + * or visit www.oracle.com if you need additional information or have any
    1.25 + * questions.
    1.26 + */
    1.27 +
    1.28 +/*
    1.29 + * This file is available under and governed by the GNU General Public
    1.30 + * License version 2 only, as published by the Free Software Foundation.
    1.31 + * However, the following notice accompanied the original version of this
    1.32 + * file:
    1.33 + *
    1.34 + * Written by Doug Lea with assistance from members of JCP JSR-166
    1.35 + * Expert Group and released to the public domain, as explained at
    1.36 + * http://creativecommons.org/publicdomain/zero/1.0/
    1.37 + */
    1.38 +
    1.39 +package java.util.concurrent.locks;
    1.40 +
    1.41 +/**
    1.42 + * A synchronizer that may be exclusively owned by a thread.  This
    1.43 + * class provides a basis for creating locks and related synchronizers
    1.44 + * that may entail a notion of ownership.  The
    1.45 + * <tt>AbstractOwnableSynchronizer</tt> class itself does not manage or
    1.46 + * use this information. However, subclasses and tools may use
    1.47 + * appropriately maintained values to help control and monitor access
    1.48 + * and provide diagnostics.
    1.49 + *
    1.50 + * @since 1.6
    1.51 + * @author Doug Lea
    1.52 + */
    1.53 +public abstract class AbstractOwnableSynchronizer
    1.54 +    implements java.io.Serializable {
    1.55 +
    1.56 +    /** Use serial ID even though all fields transient. */
    1.57 +    private static final long serialVersionUID = 3737899427754241961L;
    1.58 +
    1.59 +    /**
    1.60 +     * Empty constructor for use by subclasses.
    1.61 +     */
    1.62 +    protected AbstractOwnableSynchronizer() { }
    1.63 +
    1.64 +    /**
    1.65 +     * The current owner of exclusive mode synchronization.
    1.66 +     */
    1.67 +    private transient Thread exclusiveOwnerThread;
    1.68 +
    1.69 +    /**
    1.70 +     * Sets the thread that currently owns exclusive access. A
    1.71 +     * <tt>null</tt> argument indicates that no thread owns access.
    1.72 +     * This method does not otherwise impose any synchronization or
    1.73 +     * <tt>volatile</tt> field accesses.
    1.74 +     */
    1.75 +    protected final void setExclusiveOwnerThread(Thread t) {
    1.76 +        exclusiveOwnerThread = t;
    1.77 +    }
    1.78 +
    1.79 +    /**
    1.80 +     * Returns the thread last set by
    1.81 +     * <tt>setExclusiveOwnerThread</tt>, or <tt>null</tt> if never
    1.82 +     * set.  This method does not otherwise impose any synchronization
    1.83 +     * or <tt>volatile</tt> field accesses.
    1.84 +     * @return the owner thread
    1.85 +     */
    1.86 +    protected final Thread getExclusiveOwnerThread() {
    1.87 +        return exclusiveOwnerThread;
    1.88 +    }
    1.89 +}