sun/jdi/SuspendThreadTest.java

/*
 * Copyright (c) 2006, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
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 * 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.
 *
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 */

/**
 *  @test
 *  @bug 6485605
 *  @summary com.sun.jdi.InternalException: Inconsistent suspend policy in internal event handler
 *
 *  @author jjh
 *
 *  @run build TestScaffold VMConnection TargetListener TargetAdapter
 *  @run compile -g SuspendThreadTest.java
 *  @run main SuspendThreadTest
 */
import com.sun.jdi.*;
import com.sun.jdi.event.*;
import com.sun.jdi.request.*;

import java.util.*;

    /********** target program **********/

class SuspendThreadTarg {
    public static long count;

    public static void bkpt() {
        count++;
    }

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

        // We need this to be running so the bkpt
        // can be hit immediately when it is enabled
        // in the back-end.
        while(count >= 0) {
            bkpt();
        }
        System.out.println("Goodbye from SuspendThreadTarg, count = " + count);
    }
}

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

public class SuspendThreadTest extends TestScaffold {
    ClassType targetClass;
    ThreadReference mainThread;

    SuspendThreadTest (String args[]) {
        super(args);
    }

    public static void main(String[] args)      throws Exception {
        new SuspendThreadTest(args).startTests();
    }

    /********** event handlers **********/

    // 1000 makes the test take over 2 mins on win32
    static int maxBkpts = 200;
    int bkptCount;
    BreakpointRequest bkptRequest;
    Field debuggeeCountField;

    // When we get a bkpt we want to disable the request,
    // resume the debuggee, and then re-enable the request
    public void breakpointReached(BreakpointEvent event) {
        System.out.println("Got BreakpointEvent: " + bkptCount +
                           ", debuggeeCount = " +
                           ((LongValue)targetClass.
                            getValue(debuggeeCountField)).value()
                           );
        bkptRequest.disable();
    }

    public void eventSetComplete(EventSet set) {
        set.resume();

        // The main thread watchs the bkptCount to
        // see if bkpts stop coming in.  The
        // test _should_ fail well before maxBkpts bkpts.
        if (bkptCount++ < maxBkpts) {
            bkptRequest.enable();
        }
    }

    public void vmDisconnected(VMDisconnectEvent event) {
        println("Got VMDisconnectEvent");
    }

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

    protected void runTests() throws Exception {
        /*
         * Get to the top of main()
         * to determine targetClass and mainThread
         */
        BreakpointEvent bpe = startToMain("SuspendThreadTarg");
        targetClass = (ClassType)bpe.location().declaringType();
        mainThread = bpe.thread();
        EventRequestManager erm = vm().eventRequestManager();

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

        bkptRequest = erm.createBreakpointRequest(loc1);

        // Without this, it is a SUSPEND_ALL bkpt and the test will pass
        bkptRequest.setSuspendPolicy(EventRequest.SUSPEND_EVENT_THREAD);
        bkptRequest.enable();

        debuggeeCountField = targetClass.fieldByName("count");
        try {

            addListener (this);
        } catch (Exception ex){
            ex.printStackTrace();
            failure("failure: Could not add listener");
            throw new Exception("SuspendThreadTest: failed");
        }

        int prevBkptCount;
        vm().resume();
        while (bkptCount < maxBkpts) {
            prevBkptCount = bkptCount;
            // If we don't get a bkpt within 5 secs,
            // the test fails
            try {
                Thread.sleep(5000);
            } catch (InterruptedException ee) {
            }
            if (prevBkptCount == bkptCount) {
                failure("failure: test hung");
                break;
            }
            prevBkptCount = bkptCount;
        }
        println("done with loop");
        bkptRequest.disable();
        removeListener(this);


        /*
         * deal with results of test
         * if anything has called failure("foo") testFailed will be true
         */
        if (!testFailed) {
            println("SuspendThreadTest: passed");
        } else {
            throw new Exception("SuspendThreadTest: failed");
        }
    }
}