1 /*

     2  * Copyright 2009 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any questions.

    22  */

    23 

    24 /* @test

    25    @bug 6741890

    26    @summary Deadlock in Win32ShellFolderManager2

    27    @author Pavel Porvatov

    28    @run main bug6741890

    29 */

    30 

    31 import sun.awt.shell.ShellFolder;

    32 

    33 import java.io.File;

    34 import java.lang.reflect.Field;

    35 import java.util.concurrent.Callable;

    36 

    37 public class bug6741890 {

    38     /**

    39      * This mux is used to prevent NPE in the isLink and isFileSystem methods

    40      */

    41     private static final Object mux = new Object();

    42 

    43     private static final int COUNT = 100000;

    44 

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

    46         String tmpDir = System.getProperty("java.io.tmpdir");

    47 

    48         if (tmpDir.length() == 0) { //'java.io.tmpdir' isn't guaranteed to be defined

    49             tmpDir = System.getProperty("user.home");

    50         }

    51 

    52         final ShellFolder tmpFile = ShellFolder.getShellFolder(new File(tmpDir));

    53 

    54         System.out.println("Temp directory: " + tmpDir);

    55 

    56         System.out.println("Stress test was run");

    57 

    58         Thread thread = new Thread() {

    59             public void run() {

    60                 while (!isInterrupted()) {

    61                     ShellFolder.invoke(new Callable<Void>() {

    62                         public Void call() throws Exception {

    63                             synchronized (mux) {

    64                                 tmpFile.isFileSystem();

    65                                 tmpFile.isLink();

    66                             }

    67 

    68                             return null;

    69                         }

    70                     });

    71                 }

    72             }

    73         };

    74 

    75         thread.start();

    76 

    77         for (int i = 0; i < COUNT; i++) {

    78             synchronized (mux) {

    79                 clearField(tmpFile, "cachedIsLink");

    80                 clearField(tmpFile, "cachedIsFileSystem");

    81             }

    82 

    83             tmpFile.isFileSystem();

    84             tmpFile.isLink();

    85         }

    86 

    87         thread.interrupt();

    88         thread.join();

    89 

    90         System.out.println("Test passed successfully");

    91     }

    92 

    93     private static void clearField(Object o, String fieldName) throws Exception {

    94         Field field = o.getClass().getDeclaredField(fieldName);

    95 

    96         field.setAccessible(true);

    97 

    98         field.set(o, null);

    99     }

   100 }