/*

 * Copyright (c) 2012, 2013, 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.

 *

 * 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.

 *

 */

/*

 * @test

 * @bug 7190310

 * @summary Inlining WeakReference.get(), and hoisting $referent may lead to non-terminating loops

 * @run main/othervm/timeout=600 -Xbatch Test7190310

 */

/*

 * Note bug exhibits as infinite loop, timeout is helpful.

 * It should normally finish pretty quickly, but on some especially slow machines

 * it may not.  The companion _unsafe test lacks a timeout, but that is okay.

 */

import java.lang.ref.*;

public class Test7190310 {

  private static Object str = new Object() {

    public String toString() {

      return "The Object";

    }

    protected void finalize() throws Throwable {

      System.out.println("The Object is being finalized");

      super.finalize();

    }

  };

  private final static ReferenceQueue<Object> rq =

      new ReferenceQueue<Object>();

  private final static WeakReference<Object> wr =

      new WeakReference<Object>(str, rq);

  public static void main(String[] args)

      throws InterruptedException {

    Thread reader = new Thread() {

      public void run() {

        while (wr.get() != null) {

        }

        System.out.println("wr.get() returned null");

      }

    };

    Thread queueReader = new Thread() {

      public void run() {

        try {

          Reference<? extends Object> ref = rq.remove();

          System.out.println(ref);

          System.out.println("queueReader returned, ref==wr is "

              + (ref == wr));

        } catch (InterruptedException e) {

          System.err.println("Sleep interrupted - exiting");

        }

      }

    };

    reader.start();

    queueReader.start();

    Thread.sleep(1000);

    str = null;

    System.gc();

  }

}