1 /*
   2  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   3  *
   4  * This code is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License version 2 only, as
   6  * published by the Free Software Foundation.
   7  *
   8  * This code is distributed in the hope that it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  11  * version 2 for more details (a copy is included in the LICENSE file that
  12  * accompanied this code).
  13  *
  14  * You should have received a copy of the GNU General Public License version
  15  * 2 along with this work; if not, write to the Free Software Foundation,
  16  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  17  *
  18  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  19  * or visit www.oracle.com if you need additional information or have any
  20  * questions.
  21  */
  22 
  23 /*
  24  * This file is available under and governed by the GNU General Public
  25  * License version 2 only, as published by the Free Software Foundation.
  26  * However, the following notice accompanied the original version of this
  27  * file:
  28  *
  29  * Written by Doug Lea with assistance from members of JCP JSR-166
  30  * Expert Group and released to the public domain, as explained at
  31  * http://creativecommons.org/publicdomain/zero/1.0/
  32  */
  33 
  34 /*
  35  * @test
  36  * @author Doug Lea
  37  * @bug 8004138
  38  * @summary Check if ForkJoinPool table leaks thrown exceptions.
  39  * @run main/othervm -Xmx8m -Djava.util.concurrent.ForkJoinPool.common.parallelism=4 FJExceptionTableLeak
  40  */
  41 
  42 import java.util.concurrent.ForkJoinPool;
  43 import java.util.concurrent.RecursiveAction;
  44 
  45 public class FJExceptionTableLeak {
  46     // This test was observed to fail with pre-bug-fix jdk7 -Xmx8m,
  47     // using STEPS = 220 and TASKS_PER_STEP = 100
  48     static final int PRE_BUG_FIX_FAILURE_STEPS = 220;
  49     static final int STEPS = 10 * PRE_BUG_FIX_FAILURE_STEPS;
  50     static final int TASKS_PER_STEP = 100;
  51 
  52     static class FailingTaskException extends RuntimeException {}
  53     static class FailingTask extends RecursiveAction {
  54         public void compute() {
  55             throw new FailingTaskException();
  56         }
  57     }
  58 
  59     public static void main(String[] args) throws InterruptedException {
  60         ForkJoinPool pool = new ForkJoinPool(4);
  61         FailingTask[] tasks = new FailingTask[TASKS_PER_STEP];
  62         for (int k = 0; k < STEPS; ++k) {
  63             for (int i = 0; i < tasks.length; ++i)
  64                 tasks[i] = new FailingTask();
  65             for (int i = 0; i < tasks.length; ++i)
  66                 pool.execute(tasks[i]);
  67             for (int i = 0; i < tasks.length; ++i) {
  68                 try {
  69                     tasks[i].join();
  70                     throw new AssertionError("should throw");
  71                 } catch (FailingTaskException success) {}
  72             }
  73         }
  74     }
  75 }