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.stop() at thread exit.
  28  * @run main/othervm -Xlog:thread+smr=debug StopAtExit
  29  */
  30 
  31 import java.util.concurrent.CountDownLatch;
  32 import java.util.concurrent.TimeUnit;
  33 
  34 public class StopAtExit extends Thread {
  35     final static int N_THREADS = 32;
  36     final static int N_LATE_CALLS = 1000;
  37 
  38     public CountDownLatch exitSyncObj = new CountDownLatch(1);
  39     public CountDownLatch startSyncObj = new CountDownLatch(1);
  40 
  41     @Override
  42     public void run() {
  43         try {
  44             // Tell main thread we have started.
  45             startSyncObj.countDown();
  46             try {
  47                 // Wait for main thread to interrupt us so we
  48                 // can race to exit.
  49                 exitSyncObj.await();
  50             } catch (InterruptedException e) {
  51                 // ignore because we expect one
  52             }
  53         } catch (ThreadDeath td) {
  54             // ignore because we're testing Thread.stop() which throws it
  55         } catch (NoClassDefFoundError ncdfe) {
  56             // ignore because we're testing Thread.stop() which can cause it
  57         }
  58     }
  59 
  60     public static void main(String[] args) {
  61         StopAtExit threads[] = new StopAtExit[N_THREADS];
  62 
  63         for (int i = 0; i < N_THREADS; i++ ) {
  64             threads[i] = new StopAtExit();
  65             int late_count = 1;
  66             threads[i].start();
  67             try {
  68                 // Wait for the worker thread to get going.
  69                 threads[i].startSyncObj.await();
  70 
  71                 // This interrupt() call will break the worker out
  72                 // of the exitSyncObj.await() call and the stop()
  73                 // calls will come in during thread exit.
  74                 threads[i].interrupt();
  75                 for (; late_count <= N_LATE_CALLS; late_count++) {
  76                     threads[i].stop();
  77 
  78                     if (!threads[i].isAlive()) {
  79                         // Done with Thread.stop() calls since
  80                         // thread is not alive.
  81                         break;
  82                     }
  83                 }
  84             } catch (InterruptedException e) {
  85                 throw new Error("Unexpected: " + e);
  86             } catch (NoClassDefFoundError ncdfe) {
  87                 // Ignore because we're testing Thread.stop() which can
  88                 // cause it. Yes, a NoClassDefFoundError that happens
  89                 // in a worker thread can subsequently be seen in the
  90                 // main thread.
  91             }
  92 
  93             System.out.println("INFO: thread #" + i + ": made " + late_count +
  94                                " late calls to java.lang.Thread.stop()");
  95             System.out.println("INFO: thread #" + i + ": N_LATE_CALLS==" +
  96                                N_LATE_CALLS + " value is " +
  97                                ((late_count >= N_LATE_CALLS) ? "NOT " : "") +
  98                                "large enough to cause a Thread.stop() " +
  99                                "call after thread exit.");
 100 
 101             try {
 102                 threads[i].join();
 103             } catch (InterruptedException e) {
 104                 throw new Error("Unexpected: " + e);
 105             }
 106             threads[i].stop();
 107             if (threads[i].isAlive()) {
 108                 throw new Error("Expected !Thread.isAlive() after thread #" +
 109                                 i + " has been join()'ed");
 110             }
 111         }
 112 
 113         String cmd = System.getProperty("sun.java.command");
 114         if (cmd != null && !cmd.startsWith("com.sun.javatest.regtest.agent.MainWrapper")) {
 115             // Exit with success in a non-JavaTest environment:
 116             System.exit(0);
 117         }
 118     }
 119 }