/*

 * Copyright (c) 2016, 2018, Red Hat, Inc. All rights reserved.

 *

 * 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 TestEvilSyncBug

 * @summary Tests for crash/assert when attaching init thread during shutdown

 * @key gc

 * @requires vm.gc.Shenandoah & !vm.graal.enabled

 * @library /test/lib

 * @modules java.base/jdk.internal.misc

 *          java.management

 * @run driver/timeout=480 TestEvilSyncBug

 */

import java.util.*;

import java.util.concurrent.*;

import java.util.concurrent.locks.*;

import jdk.test.lib.process.ProcessTools;

import jdk.test.lib.process.OutputAnalyzer;

public class TestEvilSyncBug {

    private static final int NUM_RUNS = 100;

    static Thread[] hooks = new MyHook[10000];

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

        if (args.length > 0) {

            test();

        } else {

            ExecutorService pool = Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors());

            Future<?>[] fs = new Future<?>[NUM_RUNS];

            for (int c = 0; c < NUM_RUNS; c++) {

                Callable<Void> task = () -> {

                    ProcessBuilder pb = ProcessTools.createJavaProcessBuilder("-Xms128m",

                            "-Xmx128m",

                            "-XX:+UnlockExperimentalVMOptions",

                            "-XX:+UnlockDiagnosticVMOptions",

                            "-XX:+UseShenandoahGC",

                            "-XX:ShenandoahGCHeuristics=aggressive",

                            "TestEvilSyncBug", "test");

                    OutputAnalyzer output = new OutputAnalyzer(pb.start());

                    output.shouldHaveExitValue(0);

                    return null;

                };

                fs[c] = pool.submit(task);

            }

            for (Future<?> f : fs) {

                f.get();

            }

            pool.shutdown();

            pool.awaitTermination(1, TimeUnit.HOURS);

        }

    }

    private static void test() throws Exception {

        for (int t = 0; t < hooks.length; t++) {

            hooks[t] = new MyHook();

        }

        ExecutorService service = Executors.newFixedThreadPool(

                2,

                r -> {

                    Thread t = new Thread(r);

                    t.setDaemon(true);

                    return t;

                }

        );

        List<Future<?>> futures = new ArrayList<>();

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

            Runtime.getRuntime().addShutdownHook(hooks[c]);

            final Test[] tests = new Test[1000];

            for (int t = 0; t < tests.length; t++) {

                tests[t] = new Test();

            }

            Future<?> f1 = service.submit(() -> {

                Runtime.getRuntime().addShutdownHook(new MyHook());

                IntResult2 r = new IntResult2();

                for (Test test : tests) {

                    test.RL_Us(r);

                }

            });

            Future<?> f2 = service.submit(() -> {

                Runtime.getRuntime().addShutdownHook(new MyHook());

                for (Test test : tests) {

                    test.WLI_Us();

                }

            });

            futures.add(f1);

            futures.add(f2);

        }

        for (Future<?> f : futures) {

            f.get();

        }

    }

    public static class IntResult2 {

        int r1, r2;

    }

    public static class Test {

        final StampedLock lock = new StampedLock();

        int x, y;

        public void RL_Us(IntResult2 r) {

            StampedLock lock = this.lock;

            long stamp = lock.readLock();

            r.r1 = x;

            r.r2 = y;

            lock.unlock(stamp);

        }

        public void WLI_Us() {

            try {

                StampedLock lock = this.lock;

                long stamp = lock.writeLockInterruptibly();

                x = 1;

                y = 2;

                lock.unlock(stamp);

            } catch (InterruptedException e) {

                throw new RuntimeException(e);

            }

        }

    }

    private static class MyHook extends Thread {

        @Override

        public void run() {

            try {

                Thread.sleep(10);

            } catch (Exception e) {}

        }

    }

}