/*

 * 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 4118056

 *

 * @summary synopsis: Distributed Garbage Collection Deadlock

 * @author Laird Dornin

 *

 * @library ../../testlibrary

 * @build DGCDeadLock

 * @build Test

 * @build TestImpl

 * @build TestImpl_Stub

 * @run main/othervm/policy=security.policy/timeout=360 DGCDeadLock

 */

/* This test attempts to cause a deadlock between the rmi leaseChecker

 * thread and a thread that is servicing a dgc clean call. Before the

 * fix for this bug was implemented, deadlock could occur when the

 * leaseChecker held the lock on the lease table and the clean thread

 * held the lock on a target x. The clean thread would attempt to get

 * the lock on the leaseTable to do DGCImpl.unregisterTarget and the

 * leaseChecker would attempt to get the lock on x to do

 * Target.vmidDead.  Each thread held a resource that the other thread

 * was attempting to lock.

 *

 * This test causes the above conditions to occur and waits to see if

 * a given set of remote calls finishes "quickly enough."

 */

import java.rmi.*;

import java.io.*;

public class DGCDeadLock implements Runnable {

    final static public int HOLD_TARGET_TIME = 25000;

    public static int TEST_FAIL_TIME = HOLD_TARGET_TIME + 30000;

    public static boolean finished = false;

    static DGCDeadLock test = new DGCDeadLock();

    static {

        System.setProperty("sun.rmi.transport.cleanInterval", "50");

    }

    static public void main(String[] args) {

        JavaVM testImplVM = null;

        System.err.println("\nregression test for 4118056\n");

        TestLibrary.suggestSecurityManager("java.rmi.RMISecurityManager");

        try {

            String options = " -Djava.security.policy=" +

                TestParams.defaultPolicy +

                " -Djava.rmi.dgc.leaseValue=500000" +

                "  -Dsun.rmi.dgc.checkInterval=" +

            testImplVM = new JavaVM("TestImpl", options, "");

            testImplVM.start();

            synchronized (test) {

                Thread t = new Thread(test);

                t.setDaemon(true);

                t.start();

                // wait for the remote calls to take place

                test.wait(TEST_FAIL_TIME);

            }

            if (!finished) {

                TestLibrary.bomb("Test failed, had exception or exercise" +

                                           " routines took too long to " +

                                           "execute");

            }

            System.err.println("Test passed, exercises " +

                               "finished in time.");

        } catch (Exception e) {

            testImplVM = null;

            TestLibrary.bomb("test failed", e);

        }

    }

    public void run() {

        try {

            String echo = null;

            // give the test remote object time to initialize.

            Thread.currentThread().sleep(8000);

            // create a test client

            Test foo = (Test) Naming.lookup("rmi://:" +

                                            "/Foo");

            echo = foo.echo("Hello world");

            System.err.println("Test object created.");

            /* give TestImpl time to lock the target in the

             * object table and any dirtys finish.

             */

            Thread.currentThread().sleep(5000);

            //unreference "Foo"

            foo = null;

            //garbage collect and finalize foo

            Runtime.getRuntime().gc();

            Runtime.getRuntime().runFinalization();

            //import "Bar"

            Test bar = (Test) Naming.lookup("rmi://:" +

                                            "/Bar");

            /* infinite loop to show the liveness of Client,

             * if we have deadlock remote call will not return

             */

            try {

                for (int i = 0; i < 500; i++) {

                    echo = bar.echo("Remote call" + i);

                    Thread.sleep(10);

                }

                // flag exercises finished

                finished = true;

            } catch (RemoteException e) {

            }

        } catch (Exception e) {

            TestLibrary.bomb("test failed", e);

        } finally {

        }

    }

}