/*

 * 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

 *  @bug 6751643

 *  @summary  ThreadReference.ownedMonitors() can return null

 *

 *  @author jjh

 *

 *  @run build TestScaffold VMConnection TargetListener TargetAdapter

 *  @run compile -g SimulResumerTest.java

 *  @run driver SimulResumerTest

 */

import com.sun.jdi.*;

import com.sun.jdi.event.*;

import com.sun.jdi.request.*;

import java.util.*;

/*

 * This debuggee basically runs two threads each of

 * which loop, hitting a bkpt in each iteration.

 *

 */

class SimulResumerTarg extends Thread {

    static boolean one = false;

    static String name1 = "Thread 1";

    static String name2 = "Thread 2";

    static int count = 10000;

    public static void main(String[] args) {

        System.out.println("Howdy!");

        SimulResumerTarg t1 = new SimulResumerTarg(name1);

        SimulResumerTarg t2 = new SimulResumerTarg(name2);

        t1.start();

        t2.start();

    }

    public SimulResumerTarg(String name) {

        super(name);

    }

    public void run() {

        if (getName().equals(name1)) {

            run1();

        } else {

            run2();

        }

    }

    public void bkpt1(int i) {

        synchronized(name1) {

            yield();

        }

    }

    public void run1() {

        int i = 0;

        while (i < count) {

            i++;

            bkpt1(i);

        }

    }

    public void bkpt2(int i) {

        synchronized(name2) {

            yield();

        }

    }

    public void run2() {

        int i = 0;

        while (i < count) {

            i++;

            bkpt2(i);

        }

    }

}

/********** test program **********/

public class SimulResumerTest extends TestScaffold {

    ReferenceType targetClass;

    ThreadReference mainThread;

    BreakpointRequest request1;

    BreakpointRequest request2;

    static volatile int bkpts = 0;

    static int iters = 0;

    Thread resumerThread;

    static int waitTime = 100;

    ThreadReference debuggeeThread1 = null;

    ThreadReference debuggeeThread2 = null;

    SimulResumerTest (String args[]) {

        super(args);

    }

    public static void main(String[] args)      throws Exception {

        new SimulResumerTest(args).startTests();

    }

    /* BreakpointEvent handler */

    public void breakpointReached(BreakpointEvent event) {

        // save ThreadRefs for the two debuggee threads

        ThreadReference thr = event.thread();

        if (bkpts == 0) {

            resumerThread.start();

            debuggeeThread1 = thr;

            System.out.println("thr1 = " + debuggeeThread1);

        }

        if (debuggeeThread2 == null && thr != debuggeeThread1) {

            debuggeeThread2 = thr;

            System.out.println("thr2 = " + debuggeeThread2);

        }

        synchronized("abc") {

            bkpts++;

        }

        /**

        if (bkpts >= SimulResumerTarg.count * 2) {

            resumerThread.interrupt();

        }

        *****/

    }

    /********** test core **********/

    void check(ThreadReference thr) {

        // This calls each ThreadReference method that could fail due to the bug

        // that occurs if a resume is done while a call to the method is in process.

        String kind = "";

        if (thr != null) {

            try {

                kind = "ownedMonitors()";

                System.out.println("kind = " + kind);

                if (thr.ownedMonitors() == null) {

                    failure("failure: ownedMonitors = null");

                }

                kind = "ownedMonitorsAndFrames()";

                System.out.println("kind = " + kind);

                if (thr.ownedMonitorsAndFrames() == null) {

                    failure("failure: ownedMonitorsAndFrames = null");

                }

                kind = "currentContendedMonitor()";

                System.out.println("kind = " + kind);

                thr.currentContendedMonitor();

                // no failure return value here; could cause an NPE

                kind = "frames()";

                System.out.println("kind = " + kind);

                List<StackFrame> frames = thr.frames();

                // no failure return value here; could cause an NPE

                kind = "frames(0, size - 1)";

                System.out.println("kind = " + kind);

                int nframes = frames.size();

                while (nframes > 0) {

                    try {

                        thr.frames(0, nframes - 1);

                        break;

                    } catch (IndexOutOfBoundsException iobe) {

                        // 6815126. let's try to get less frames

                        iobe.printStackTrace();

                        nframes--;

                    }

                }

                kind = "frameCount()";

                System.out.println("kind = " + kind);

                if (thr.frameCount() == -1) {

                    failure("failure: frameCount = -1");

                }

                kind = "name()";

                System.out.println("kind = " + kind);

                if (thr.name() == null) {

                    failure("failure: name = null");

                }

                kind = "status()";

                System.out.println("kind = " + kind);

                if (thr.status() < 0) {

                    failure("failure: status < 0");

                }

            } catch (IncompatibleThreadStateException ee) {

                // ignore

            } catch (VMDisconnectedException ee) {

                // This is how we stop.  The debuggee runs to completion

                // and we get this exception.

                throw ee;

            } catch (Exception ee) {

                failure("failure: Got exception from " + kind + ": " + ee );

            }

        }

    }

    protected void runTests() throws Exception {

        /*

         * Get to the top of main()

         * to determine targetClass and mainThread

         */

        BreakpointEvent bpe = startToMain("SimulResumerTarg");

        targetClass = bpe.location().declaringType();

        mainThread = bpe.thread();

        EventRequestManager erm = vm().eventRequestManager();

        final Thread mainThread = Thread.currentThread();

        /*

         * Set event requests

         */

        Location loc1 = findMethod(targetClass, "bkpt1", "(I)V").location();

        Location loc2 = findMethod(targetClass, "bkpt2", "(I)V").location();

        request1 = erm.createBreakpointRequest(loc1);

        request2 = erm.createBreakpointRequest(loc2);

        request1.enable();

        request2.enable();

        /*

         * This thread will be started when we get the first bkpt.

         */

        resumerThread = new Thread("test resumer") {

                public void run() {

                    while (true) {

                        iters++;

                        System.out.println("bkpts = " + bkpts + ", iters = " + iters);

                        try {

                            Thread.sleep(waitTime);

                            check(debuggeeThread1);

                            check(debuggeeThread2);

                        } catch (InterruptedException ee) {

                            // If the test completes, this occurs.

                            println("resumer Interrupted");

                            break;

                        } catch (VMDisconnectedException ee) {

                            println("VMDisconnectedException");

                            break;

                        }

                    }

                }

            };

        /*

         * resume the target, listening for events

         */

        listenUntilVMDisconnect();

        resumerThread.interrupt();

        /*

         * deal with results of test

         * if anything has called failure("foo") testFailed will be true

         */

        if (!testFailed) {

            println("SimulResumerTest: passed; bkpts = " + bkpts + ", iters = " + iters);

        } else {

            throw new Exception("SimulResumerTest: failed; bkpts = " + bkpts + ", iters = " + iters);

        }

    }

}