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23
24/* @test
25   @bug 6741890 8171363
26   @summary Deadlock in Win32ShellFolderManager2
27   @author Pavel Porvatov
28   @modules java.desktop/sun.awt
29            java.desktop/sun.awt.shell:+open
30   @run main bug6741890
31*/
32
33import sun.awt.shell.ShellFolder;
34import sun.awt.OSInfo;
35
36import java.io.File;
37import java.lang.reflect.Field;
38import java.util.concurrent.Callable;
39
40public 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}
110