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 * Copyright (c) 2019, 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.

 *

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 */

/*

 * @test

 * @bug 4656449 4945125 8074355

 * @summary Make MutexLocker smarter about non-Java threads

 * @library /test/lib

 * @run driver/timeout=240 ShutdownTest

 */

// This test is adapted from an old regression test for bug 4945125, where VerifyBeforeExit

// crashes before exit for the regression test for bug 4656449.

// The fix is to acquire the Heap_lock before exit after the JavaThread is removed from

// the threads list.  This fix is still valid.  This code requires Heap_lock be acquired

// without a safepoint check at exit.

import jdk.test.lib.process.OutputAnalyzer;

import jdk.test.lib.process.ProcessTools;

import java.util.ArrayList;

import java.util.Collections;

import java.util.List;

public class ShutdownTest {

   Object[] obj;

   ShutdownTest() {

       // Allocate to get some GC pressure.

       obj = new Object[100000];

   }

    static class ShutdownTestThread extends Thread {

       public void run() {

         while (true) {

           ShutdownTest st = new ShutdownTest();

         }

       }

       public static void main(String args[]) {

         System.out.println("- ShutdownTest -");

         for (int i = 0; i < 100; i++) {

           ShutdownTestThread st = new ShutdownTestThread();

           st.setDaemon(true);

           st.start();

         }

       }

    }

    private static void startVM(List<String> options) throws Throwable {

        // Combine VM flags given from command-line and your additional options

        OutputAnalyzer output = ProcessTools.executeTestJvm(options.toArray(new String[options.size()]));

        output.shouldContain("- ShutdownTest -");

        output.shouldHaveExitValue(0);

    }

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

        List<String> options = new ArrayList<>();

        Collections.addAll(options,

                "-Xmx2500k",

                "-XX:+UnlockDiagnosticVMOptions",

                "-XX:+VerifyBeforeExit");

        options.add(ShutdownTestThread.class.getName());

        for (int iteration = 0; iteration < 5; ++iteration) {

            startVM(options);

        }

    }

}