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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 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
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 * 2 along with this work; if not, write to the Free Software Foundation,
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/**
 * @test
 * @summary Verifies specific JVMTI functions work with current virtual thread passed as NULL.
 * @compile --enable-preview -source ${jdk.version} NullAsCurrentThreadTest.java
 * @run main/othervm/native --enable-preview -agentlib:NullAsCurrentThreadTest=EnableVirtualThreadSupport NullAsCurrentThreadTest
 */

public class NullAsCurrentThreadTest {
    private static final String AGENT_LIB = "NullAsCurrentThreadTest";
    private static void log (String msg) { System.out.println(msg); }
    private static Object lock = new Object();

    native static boolean failedStatus();
    native static void testJvmtiFunctions();

    static int factorial(int num) {
        int fact = 1;
        if (num > 1) {
            fact = num * factorial(num - 1);
        } else {
            testJvmtiFunctions();
        }
        return fact;
    }

    final Runnable pinnedTask = () -> {
        synchronized (lock) {
            int fact = factorial(10);
            log("Java App: Factorial(10) = " + fact);
        }
    };

    void runTest() throws Exception {
        Thread vthread = Thread.ofVirtual().name("TestedVThread").start(pinnedTask);
        vthread.join();
    }

    public static void main(String[] args) throws Exception {
        try {
            System.loadLibrary(AGENT_LIB);
        } catch (UnsatisfiedLinkError ex) {
            log("Java App: Failed to load " + AGENT_LIB + " lib");
            log("Java App: java.library.path: " + System.getProperty("java.library.path"));
            throw ex;
        }
        NullAsCurrentThreadTest tst = new NullAsCurrentThreadTest();
        tst.runTest();
        boolean failed = failedStatus();
        if (failed) {
            throw new RuntimeException("NullAsCurrentThreadTest FAILED: failed status from native agent");
        }
    }
}