test/jdk/com/sun/jdi/MixedSuspendTest.java

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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
 * accompanied this code).
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 * 2 along with this work; if not, write to the Free Software Foundation,
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/*
 * @test
 * @bug 6224859
 * @summary JDWP: Mixing application suspends and debugger suspends can cause hangs
 * @comment converted from test/jdk/com/sun/jdi/MixedSuspendTest.sh
 *
 * @library /test/lib
 * @run main/othervm MixedSuspendTest
 */

import lib.jdb.JdbCommand;
import lib.jdb.JdbTest;

class MixedSuspendTarg extends Thread {

    static volatile boolean started = true;
    static String lock = "startLock";

    public static void main(String[] args){
        System.out.println("Howdy from MixedSuspendTarg");

        MixedSuspendTarg mytarg = new MixedSuspendTarg();

        synchronized(lock) {
            mytarg.start();
            try {
                lock.wait();
            } catch(InterruptedException ee) {
            }
        }
        mytarg.suspend();
        bkpt();
        System.out.println("Debuggee: resuming thread");

        // If the bug occurs, this resume hangs in the back-end
        mytarg.resume();
        System.out.println("Debuggee: resumed thread");
        synchronized(lock) {
            started = false;
        }
        System.out.println("Debuggee: exitting, started = " + started);
    }

    public void run() {
        synchronized(lock) {
            lock.notifyAll();
        }
        while (true) {
            synchronized(lock) {
                if (!started) {
                    break;
                }
                int i = 0;
            }
        }

        System.out.println("Debuggee: end of thread");
    }

    static void bkpt() {
        //System.out.println("bkpt reached, thread = " + this.getName());
        int i = 0;   // @1 breakpoint
    }
}

public class MixedSuspendTest extends JdbTest {
    public static void main(String argv[]) {
        new MixedSuspendTest().run();
    }

    private MixedSuspendTest() {
        super(DEBUGGEE_CLASS);
    }

    private static final String DEBUGGEE_CLASS = MixedSuspendTarg.class.getName();

    @Override
    protected void runCases() {
        setBreakpointsFromTestSource("MixedSuspendTest.java", 1);
        jdb.command(JdbCommand.run());
        jdb.command(JdbCommand.cont().allowExit());

        // This test fails by timing out.
    }
}