jdk-24/test/hotspot/jtreg/serviceability/jvmti/thread/GetAllThreads/allthr01/allthr01.java

/*
 * Copyright (c) 2003, 2022, 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.
 *
 * 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
 *
 * @summary converted from VM Testbase nsk/jvmti/GetAllThreads/allthr001.
 * VM Testbase keywords: [quick, jpda, jvmti, noras]
 * VM Testbase readme:
 * DESCRIPTION
 *     The test exercises JVMTI function GetAllThreads.
 *     The test cases include:
 *     - platform, virtual and native debug threads
 *     - running and dead threads
 * COMMENTS
 *     Fixed according to the 4480280 bug.
 *     Ported from JVMDI.
 *
 * @library /test/lib
 * @compile --enable-preview -source ${jdk.version} allthr01.java
 * @run main/othervm/native --enable-preview -agentlib:allthr01 allthr01
 */

import java.util.concurrent.atomic.AtomicBoolean;

public class allthr01 {

    static {
        try {
            System.loadLibrary("allthr01");
        } catch (UnsatisfiedLinkError ule) {
            System.err.println("Could not load allthr001 library");
            System.err.println("java.library.path:"
                + System.getProperty("java.library.path"));
            throw ule;
        }
    }

    // Sync with native code
    final static String THREAD_NAME = "thread1";

    native static void setSysCnt();
    native static void startAgentThread();
    native static void stopAgentThread();
    native static boolean checkInfo0(int expectedInfoIdx);
    static void checkInfo(int expectedInfoIdx) {
        if (!checkInfo0(expectedInfoIdx)) {
            throw new RuntimeException("checkInfo failed for idx: " + expectedInfoIdx);
        }
    }

    public static void main(String[] args) {
        setSysCnt();
        checkInfo(0);

        MyThread platformThread = new MyThread(THREAD_NAME, false);
        checkInfo(1);

        platformThread.start();

        checkInfo(2);

        platformThread.finish();
        checkInfo(3);

        startAgentThread();
        checkInfo(4);
        stopAgentThread();

        MyThread virtualThread = new MyThread(THREAD_NAME, true);
        virtualThread.start();
        checkInfo(5);
        virtualThread.finish();
    }
}

class MyThread implements Runnable {
    private final Thread thread;
    private final AtomicBoolean isStarted = new AtomicBoolean(false);
    private final AtomicBoolean shouldStop = new AtomicBoolean(false);

    MyThread(String name, boolean isVirtual) {
        if (isVirtual) {
            thread = Thread.ofVirtual().name(name).unstarted(this);
        } else {
            ThreadGroup tg = new ThreadGroup("tg1");
            thread = Thread.ofPlatform().name(name).group(tg).daemon(true).unstarted(this);
        }
    }

    void start() {
        thread.start();
        waitUntilThreadIsStarted();
    }

    @Override
    public void run() {
        isStarted.set(true);
        while(!shouldStop.get()) {
            try {
                Thread.sleep(10);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

    private void waitUntilThreadIsStarted() {
        while (!isStarted.get()) {
            try {
                Thread.sleep(10);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

    void finish() {
        try {
            shouldStop.set(true);
            thread.join();
        } catch (InterruptedException e) {
            throw new Error("Unexpected " + e);
        }
    }
}