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import java.util.ArrayList;

import java.util.List;

import java.util.stream.Collectors;

import jdk.test.lib.apps.LingeredApp;

import jdk.test.lib.apps.LingeredAppWithDeadlock;

import jdk.test.lib.Utils;

import jdk.test.lib.Platform;

import jdk.test.lib.JDKToolLauncher;

import jdk.test.lib.process.OutputAnalyzer;

import jdk.test.lib.process.ProcessTools;

 * @test

 * @summary Test deadlock detection

 * @library /test/lib

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

 * @modules java.management

 * @run main DeadlockDetectionTest

 */

public class DeadlockDetectionTest {

    private static LingeredAppWithDeadlock theApp = null;

    private static ProcessBuilder processBuilder = new ProcessBuilder();

    private static OutputAnalyzer jstack(String... toolArgs) throws Exception {

        JDKToolLauncher launcher = JDKToolLauncher.createUsingTestJDK("jhsdb");

        launcher.addToolArg("jstack");

        if (toolArgs != null) {

            for (String toolArg : toolArgs) {

                launcher.addToolArg(toolArg);

            }

        }

        processBuilder.command(launcher.getCommand());

        System.out.println(processBuilder.command().stream().collect(Collectors.joining(" ")));

        OutputAnalyzer output = ProcessTools.executeProcess(processBuilder);

        System.out.println(output.getOutput());

        return output;

    }

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

        System.out.println("Starting DeadlockDetectionTest");

        if (Platform.isOSX()) {

            // Coredump stackwalking is not implemented for Darwin

            System.out.println("This test is not expected to work on OS X. Skipping");

            return;

        }

        if (!LingeredApp.isLastModifiedWorking()) {

            // Exact behaviour of the test depends on operating system and the test nature,

            // so just print the warning and continue

            System.err.println("Warning! Last modified time doesn't work.");

        }

        try {

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

            vmArgs.add("-XX:+UsePerfData");

            vmArgs.addAll(Utils.getVmOptions());

            theApp = new LingeredAppWithDeadlock();

            LingeredApp.startApp(vmArgs, theApp);

            OutputAnalyzer output = jstack("--pid", Long.toString(theApp.getPid()));

            System.out.println(output.getOutput());

            if (output.getExitValue() == 3) {

                System.out.println("Test can't run for some reason. Skipping");

            }

            else {

                output.shouldHaveExitValue(0);

                output.shouldContain("Found a total of 1 deadlock.");

            }

        } finally {

            LingeredApp.stopApp(theApp);

        }

    }

}