1 /*

     2  * Copyright (c) 2005, 2018, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  */

    23 

    24 /*

    25  * @test

    26  * @bug 6224859

    27  * @summary JDWP: Mixing application suspends and debugger suspends can cause hangs

    28  * @comment converted from test/jdk/com/sun/jdi/MixedSuspendTest.sh

    29  *

    30  * @library /test/lib

    31  * @run main/othervm MixedSuspendTest

    32  */

    33 

    34 import lib.jdb.JdbCommand;

    35 import lib.jdb.JdbTest;

    36 

    37 class MixedSuspendTarg extends Thread {

    38 

    39     static volatile boolean started = true;

    40     static String lock = "startLock";

    41 

    42     public static void main(String[] args){

    43         System.out.println("Howdy from MixedSuspendTarg");

    44 

    45         MixedSuspendTarg mytarg = new MixedSuspendTarg();

    46 

    47         synchronized(lock) {

    48             mytarg.start();

    49             try {

    50                 lock.wait();

    51             } catch(InterruptedException ee) {

    52             }

    53         }

    54         mytarg.suspend();

    55         bkpt();

    56         System.out.println("Debuggee: resuming thread");

    57 

    58         // If the bug occurs, this resume hangs in the back-end

    59         mytarg.resume();

    60         System.out.println("Debuggee: resumed thread");

    61         synchronized(lock) {

    62             started = false;

    63         }

    64         System.out.println("Debuggee: exitting, started = " + started);

    65     }

    66 

    67     public void run() {

    68         synchronized(lock) {

    69             lock.notifyAll();

    70         }

    71         while (true) {

    72             synchronized(lock) {

    73                 if (!started) {

    74                     break;

    75                 }

    76                 int i = 0;

    77             }

    78         }

    79 

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

    81     }

    82 

    83     static void bkpt() {

    84         //System.out.println("bkpt reached, thread = " + this.getName());

    85         int i = 0;   // @1 breakpoint

    86     }

    87 }

    88 

    89 public class MixedSuspendTest extends JdbTest {

    90     public static void main(String argv[]) {

    91         new MixedSuspendTest().run();

    92     }

    93 

    94     private MixedSuspendTest() {

    95         super(DEBUGGEE_CLASS);

    96     }

    97 

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

    99 

   100     @Override

   101     protected void runCases() {

   102         setBreakpointsFromTestSource("MixedSuspendTest.java", 1);

   103         jdb.command(JdbCommand.run());

   104         jdb.command(JdbCommand.cont().allowExit());

   105 

   106         // This test fails by timing out.

   107     }

   108 }