/* 

 * Copyright 1998-1999 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.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=" + 

		(HOLD_TARGET_TIME - 5000) + "";

	    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://:" + 

					    TestLibrary.REGISTRY_PORT + 

					    "/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://:" + 

					    TestLibrary.REGISTRY_PORT + 

					    "/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 {

	}

    }

}