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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:GetThreadListStackTraces OneGetThreadListStackTraces
 *
 */

public class OneGetThreadListStackTraces implements Runnable {

    private CountDownLatch signal;

    public OneGetThreadListStackTraces(CountDownLatch signal) {
        this.signal = signal;
    }

    private static native void checkCallStacks(Thread thread);

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

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

        /* Wait until the thread state transits to "waiting" */
        while (th.getState() != Thread.State.WAITING) {
            Thread.onSpinWait();
        }

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

        /* Cleanup test thread */
        signal.countDown();
        th.join();
    }
}