1 /* 2 * Copyright (c) 2009, 2015, 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 @modules java.desktop/sun.awt 29 java.desktop/sun.awt.shell 30 @run main bug6741890 31 */ 32 33 import sun.awt.shell.ShellFolder; 34 import sun.awt.OSInfo; 35 36 import java.io.File; 37 import java.lang.reflect.Field; 38 import java.util.concurrent.Callable; 39 40 public class bug6741890 { 41 /** 42 * This mux is used to prevent NPE in the isLink and isFileSystem methods 43 */ 44 private static final Object mux = new Object(); 45 46 private static final int COUNT = 100000; 47 48 public static void main(String[] args) throws Exception { 49 if (OSInfo.getOSType() != OSInfo.OSType.WINDOWS) { 50 System.out.println("The test is applicable only for Windows. Skipped."); 51 52 return; 53 } 54 55 String tmpDir = System.getProperty("java.io.tmpdir"); 56 57 if (tmpDir.length() == 0) { //'java.io.tmpdir' isn't guaranteed to be defined 58 tmpDir = System.getProperty("user.home"); 59 } 60 61 final ShellFolder tmpFile = ShellFolder.getShellFolder(new File(tmpDir)); 62 63 System.out.println("Temp directory: " + tmpDir); 64 65 System.out.println("Stress test was run"); 66 67 Thread thread = new Thread() { 68 public void run() { 69 while (!isInterrupted()) { 70 ShellFolder.invoke(new Callable<Void>() { 71 public Void call() throws Exception { 72 synchronized (mux) { 73 tmpFile.isFileSystem(); 74 tmpFile.isLink(); 75 } 76 77 return null; 78 } 79 }); 80 } 81 } 82 }; 83 84 thread.start(); 85 86 for (int i = 0; i < COUNT; i++) { 87 synchronized (mux) { 88 clearField(tmpFile, "cachedIsLink"); 89 clearField(tmpFile, "cachedIsFileSystem"); 90 } 91 92 tmpFile.isFileSystem(); 93 tmpFile.isLink(); 94 } 95 96 thread.interrupt(); 97 thread.join(); 98 99 System.out.println("Test passed successfully"); 100 } 101 102 private static void clearField(Object o, String fieldName) throws Exception { 103 Field field = o.getClass().getDeclaredField(fieldName); 104 105 field.setAccessible(true); 106 107 field.set(o, null); 108 } 109 }