1 /*
   2  * Copyright (c) 2009, 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 /* @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 import sun.awt.OSInfo;
  33 
  34 import java.io.File;
  35 import java.lang.reflect.Field;
  36 import java.util.concurrent.Callable;
  37 
  38 public class bug6741890 {
  39     /**
  40      * This mux is used to prevent NPE in the isLink and isFileSystem methods
  41      */
  42     private static final Object mux = new Object();
  43 
  44     private static final int COUNT = 100000;
  45 
  46     public static void main(String[] args) throws Exception {
  47         if (OSInfo.getOSType() != OSInfo.OSType.WINDOWS) {
  48             System.out.println("The test is applicable only for Windows. Skipped.");
  49 
  50             return;
  51         }
  52 
  53         String tmpDir = System.getProperty("java.io.tmpdir");
  54 
  55         if (tmpDir.length() == 0) { //'java.io.tmpdir' isn't guaranteed to be defined
  56             tmpDir = System.getProperty("user.home");
  57         }
  58 
  59         final ShellFolder tmpFile = ShellFolder.getShellFolder(new File(tmpDir));
  60 
  61         System.out.println("Temp directory: " + tmpDir);
  62 
  63         System.out.println("Stress test was run");
  64 
  65         Thread thread = new Thread() {
  66             public void run() {
  67                 while (!isInterrupted()) {
  68                     ShellFolder.invoke(new Callable<Void>() {
  69                         public Void call() throws Exception {
  70                             synchronized (mux) {
  71                                 tmpFile.isFileSystem();
  72                                 tmpFile.isLink();
  73                             }
  74 
  75                             return null;
  76                         }
  77                     });
  78                 }
  79             }
  80         };
  81 
  82         thread.start();
  83 
  84         for (int i = 0; i < COUNT; i++) {
  85             synchronized (mux) {
  86                 clearField(tmpFile, "cachedIsLink");
  87                 clearField(tmpFile, "cachedIsFileSystem");
  88             }
  89 
  90             tmpFile.isFileSystem();
  91             tmpFile.isLink();
  92         }
  93 
  94         thread.interrupt();
  95         thread.join();
  96 
  97         System.out.println("Test passed successfully");
  98     }
  99 
 100     private static void clearField(Object o, String fieldName) throws Exception {
 101         Field field = o.getClass().getDeclaredField(fieldName);
 102 
 103         field.setAccessible(true);
 104 
 105         field.set(o, null);
 106     }
 107 }