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23 
24 /**
25  * @test
26  * @bug 8167108
27  * @summary Stress test java.lang.Thread.interrupt() at thread exit.
28  * @run main/othervm -Xlog:thread+smr=debug InterruptAtExit
29  */
30 
31 import java.util.concurrent.CountDownLatch;
32 
33 public class InterruptAtExit extends Thread {
34     final static int N_THREADS = 32;
35     final static int N_LATE_CALLS = 1000;
36 
37     public CountDownLatch exitSyncObj = new CountDownLatch(1);
38     public CountDownLatch startSyncObj = new CountDownLatch(1);
39 
40     @Override
run()41     public void run() {
42         // Tell main thread we have started.
43         startSyncObj.countDown();
44         try {
45             // Wait for main thread to interrupt us so we
46             // can race to exit.
47             exitSyncObj.await();
48         } catch (InterruptedException e) {
49             // ignore because we expect one
50         }
51     }
52 
main(String[] args)53     public static void main(String[] args) {
54         InterruptAtExit threads[] = new InterruptAtExit[N_THREADS];
55 
56         for (int i = 0; i < N_THREADS; i++ ) {
57             threads[i] = new InterruptAtExit();
58             int late_count = 1;
59             threads[i].start();
60             try {
61                 // Wait for the worker thread to get going.
62                 threads[i].startSyncObj.await();
63 
64                 // The first interrupt() call will break the
65                 // worker out of the exitSyncObj.await() call
66                 // and the rest will come in during thread exit.
67                 for (; late_count <= N_LATE_CALLS; late_count++) {
68                     threads[i].interrupt();
69 
70                     if (!threads[i].isAlive()) {
71                         // Done with Thread.interrupt() calls since
72                         // thread is not alive.
73                         break;
74                     }
75                 }
76             } catch (InterruptedException e) {
77                 throw new Error("Unexpected: " + e);
78             }
79 
80             System.out.println("INFO: thread #" + i + ": made " + late_count +
81                                " late calls to java.lang.Thread.interrupt()");
82             System.out.println("INFO: thread #" + i + ": N_LATE_CALLS==" +
83                                N_LATE_CALLS + " value is " +
84                                ((late_count >= N_LATE_CALLS) ? "NOT " : "") +
85                                "large enough to cause a Thread.interrupt() " +
86                                "call after thread exit.");
87 
88             try {
89                 threads[i].join();
90             } catch (InterruptedException e) {
91                 throw new Error("Unexpected: " + e);
92             }
93             threads[i].interrupt();
94             if (threads[i].isAlive()) {
95                 throw new Error("Expected !Thread.isAlive() after thread #" +
96                                 i + " has been join()'ed");
97             }
98         }
99 
100         String cmd = System.getProperty("sun.java.command");
101         if (cmd != null && !cmd.startsWith("com.sun.javatest.regtest.agent.MainWrapper")) {
102             // Exit with success in a non-JavaTest environment:
103             System.exit(0);
104         }
105     }
106 }
107