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 }