1 /*
   2  * Copyright (c) 2005, 2011, 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 6233235 6268386
  27  * @summary Test allowsCoreThreadTimeOut
  28  * @library /test/lib
  29  * @author Martin Buchholz
  30  */
  31 
  32 import static java.util.concurrent.TimeUnit.MILLISECONDS;
  33 
  34 import java.util.concurrent.ArrayBlockingQueue;
  35 import java.util.concurrent.BlockingQueue;
  36 import java.util.concurrent.Executors;
  37 import java.util.concurrent.ThreadFactory;
  38 import java.util.concurrent.ThreadPoolExecutor;
  39 import java.util.concurrent.TimeUnit;
  40 import jdk.test.lib.Utils;
  41 
  42 public class CoreThreadTimeOut {
  43     static final long LONG_DELAY_MS = Utils.adjustTimeout(10_000);
  44 
  45     static class IdentifiableThreadFactory implements ThreadFactory {
  46         static ThreadFactory defaultThreadFactory
  47             = Executors.defaultThreadFactory();
  48 
  49         public Thread newThread(Runnable r) {
  50             Thread t = defaultThreadFactory.newThread(r);
  51             t.setName("CoreThreadTimeOut-" + t.getName());
  52             return t;
  53         }
  54     }
  55 
  56     int countExecutorThreads() {
  57         Thread[] threads = new Thread[Thread.activeCount()+100];
  58         Thread.enumerate(threads);
  59         int count = 0;
  60         for (Thread t : threads)
  61             if (t != null &&
  62                 t.getName().matches
  63                 ("CoreThreadTimeOut-pool-[0-9]+-thread-[0-9]+"))
  64                 count++;
  65         return count;
  66     }
  67 
  68     static long millisElapsedSince(long startTime) {
  69         return (System.nanoTime() - startTime) / (1000L * 1000L);
  70     }
  71 
  72     void test(String[] args) throws Throwable {
  73         final int threadCount = 10;
  74         final int timeoutMillis = 30;
  75         BlockingQueue<Runnable> q = new ArrayBlockingQueue<>(2*threadCount);
  76         ThreadPoolExecutor tpe
  77             = new ThreadPoolExecutor(threadCount, threadCount,
  78                                      timeoutMillis, TimeUnit.MILLISECONDS,
  79                                      q, new IdentifiableThreadFactory());
  80         equal(tpe.getCorePoolSize(), threadCount);
  81         check(! tpe.allowsCoreThreadTimeOut());
  82         tpe.allowCoreThreadTimeOut(true);
  83         check(tpe.allowsCoreThreadTimeOut());
  84         equal(countExecutorThreads(), 0);
  85         long startTime = System.nanoTime();
  86         for (int i = 0; i < threadCount; i++) {
  87             tpe.submit(() -> {});
  88             int count = countExecutorThreads();
  89             if (millisElapsedSince(startTime) < timeoutMillis)
  90                 equal(count, i + 1);
  91         }
  92         while (countExecutorThreads() > 0 &&
  93                millisElapsedSince(startTime) < LONG_DELAY_MS)
  94             Thread.yield();
  95         equal(countExecutorThreads(), 0);
  96         check(millisElapsedSince(startTime) >= timeoutMillis);
  97         tpe.shutdown();
  98         check(tpe.allowsCoreThreadTimeOut());
  99         check(tpe.awaitTermination(LONG_DELAY_MS, MILLISECONDS));
 100 
 101         System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
 102         if (failed > 0) throw new Exception("Some tests failed");
 103     }
 104 
 105     //--------------------- Infrastructure ---------------------------
 106     volatile int passed = 0, failed = 0;
 107     void pass() {passed++;}
 108     void fail() {failed++; Thread.dumpStack();}
 109     void fail(String msg) {System.err.println(msg); fail();}
 110     void unexpected(Throwable t) {failed++; t.printStackTrace();}
 111     void check(boolean cond) {if (cond) pass(); else fail();}
 112     void equal(Object x, Object y) {
 113         if (x == null ? y == null : x.equals(y)) pass();
 114         else fail(x + " not equal to " + y);}
 115     public static void main(String[] args) throws Throwable {
 116         new CoreThreadTimeOut().instanceMain(args);}
 117     public void instanceMain(String[] args) throws Throwable {
 118         try {test(args);} catch (Throwable t) {unexpected(t);}
 119         System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
 120         if (failed > 0) throw new AssertionError("Some tests failed");}
 121 }