1 /*
   2  * Copyright (c) 2017, 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 /**
  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
  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 
  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 }