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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * 2 along with this work; if not, write to the Free Software Foundation,
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/**
 * @test
 * @summary Test deadlock detection
 * @requires vm.hasSA
 * @library /test/lib
 * @modules java.base/jdk.internal.misc
 * @modules java.management
 * @run driver DeadlockDetectionTest
 */

import java.util.stream.Collectors;

import jdk.test.lib.apps.LingeredApp;
import jdk.test.lib.apps.LingeredAppWithDeadlock;
import jdk.test.lib.JDKToolLauncher;
import jdk.test.lib.process.OutputAnalyzer;
import jdk.test.lib.process.ProcessTools;
import jdk.test.lib.SA.SATestUtils;
import jdk.test.lib.Utils;

import jtreg.SkippedException;

public class DeadlockDetectionTest {

    private static LingeredAppWithDeadlock theApp = null;

    private static OutputAnalyzer jstack(String... toolArgs) throws Exception {
        JDKToolLauncher launcher = JDKToolLauncher.createUsingTestJDK("jhsdb");
        launcher.addVMArgs(Utils.getTestJavaOpts());
        launcher.addToolArg("jstack");
        if (toolArgs != null) {
            for (String toolArg : toolArgs) {
                launcher.addToolArg(toolArg);
            }
        }

        ProcessBuilder processBuilder = SATestUtils.createProcessBuilder(launcher);
        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 {
        SATestUtils.skipIfCannotAttach(); // throws SkippedException if attach not expected to work.
        System.out.println("Starting DeadlockDetectionTest");

        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 {
            theApp = new LingeredAppWithDeadlock();
            LingeredApp.startApp(theApp, "-XX:+UsePerfData");
            OutputAnalyzer output = jstack("--pid", Long.toString(theApp.getPid()));
            System.out.println(output.getOutput());

            if (output.getExitValue() == 3) {
                throw new SkippedException("Test can't run for some reason");
            } else {
                output.shouldHaveExitValue(0);
                output.shouldContain("Found a total of 1 deadlock.");
            }
        } finally {
            LingeredApp.stopApp(theApp);
        }
    }
}