/*

 * 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

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 */

import java.util.Properties;

import java.util.concurrent.CyclicBarrier;

import java.util.concurrent.BrokenBarrierException;

import java.io.IOException;

import java.net.URL;

/* @test

 * @summary Test ClassLoader.getResource() that should not deadlock

 #          if another thread is holding the system properties object

 *

 * @build GetResource

 * @run main GetResource

 */

public class GetResource {

    CyclicBarrier go = new CyclicBarrier(2);

    CyclicBarrier done = new CyclicBarrier(2);

    Thread t1, t2;

    public GetResource() {

        t1 = new Thread() {

            public void run() {

                Properties prop = System.getProperties();

                synchronized (prop) {

                    System.out.println("Thread 1 ready");

                    try {

                        go.await();

                        prop.put("property", "value");

                        prop.store(System.out, "");

                        done.await();   // keep holding the lock until t2 finishes

                    } catch (InterruptedException e) {

                        throw new RuntimeException(e);

                    } catch (BrokenBarrierException e) {

                        throw new RuntimeException(e);

                    } catch (IOException e) {

                        throw new RuntimeException(e);

                    }

                }

                System.out.println("Thread 1 exits");

            }

        };

        t2 = new Thread()  {

            public void run() {

                System.out.println("Thread 2 ready");

                try {

                    go.await();  // wait until t1 holds the lock of the system properties

                    URL u1 = Thread.currentThread().getContextClassLoader().getResource("unknownresource");

                    done.await();

                } catch (InterruptedException e) {

                    throw new RuntimeException(e);

                } catch (BrokenBarrierException e) {

                    throw new RuntimeException(e);

                }

                System.out.println("Thread 2 exits");

            }

        };

    }

    public void run() throws Exception {

        t1.start();

        t2.start();

        try {

            t1.join();

        } catch (InterruptedException e) {

            e.printStackTrace();

            throw e;

        }

        try {

            t2.join();

        } catch (InterruptedException e) {

            e.printStackTrace();

            throw e;

        }

    }

    public static void main(String[] args) throws Exception {

        new GetResource().run();

    }

}