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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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import java.util.concurrent.CountDownLatch;

/**
 * @test
 * @bug 8242428
 * @summary Verifies JVMTI GetThreadListStackTraces API with thread_count = 1
 * @library /test/lib
 * @run main/othervm/native -agentlib:OneGetThreadListStackTraces OneGetThreadListStackTraces
 *
 */

public class OneGetThreadListStackTraces implements Runnable {

    private CountDownLatch startSignal;
    private CountDownLatch stopSignal;

    public OneGetThreadListStackTraces(CountDownLatch startSignal, CountDownLatch stopSignal) {
        this.startSignal = startSignal;
        this.stopSignal = stopSignal;
    }

    private static native void checkCallStacks(Thread thread);

    @Override
    public void run() {
        startSignal.countDown();
        try {
            stopSignal.await();
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    public static void main(String[] args) throws Exception {
        CountDownLatch startSignal = new CountDownLatch(1);
        CountDownLatch stopSignal = new CountDownLatch(1);
        Thread th = new Thread(new OneGetThreadListStackTraces(startSignal, stopSignal), "test thread");
        th.start();

        startSignal.countDown();

        /* Check call stack of "test thread" in native */
        checkCallStacks(th);

        stopSignal.countDown();
        th.join();
    }
}