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1 /* |
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2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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3 * |
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4 * This code is free software; you can redistribute it and/or modify it |
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5 * under the terms of the GNU General Public License version 2 only, as |
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6 * published by the Free Software Foundation. |
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7 * |
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8 * This code is distributed in the hope that it will be useful, but WITHOUT |
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9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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11 * version 2 for more details (a copy is included in the LICENSE file that |
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12 * accompanied this code). |
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13 * |
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14 * You should have received a copy of the GNU General Public License version |
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15 * 2 along with this work; if not, write to the Free Software Foundation, |
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16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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17 * |
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18 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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19 * or visit www.oracle.com if you need additional information or have any |
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20 * questions. |
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21 */ |
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22 |
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23 /* |
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24 * This file is available under and governed by the GNU General Public |
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25 * License version 2 only, as published by the Free Software Foundation. |
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26 * However, the following notice accompanied the original version of this |
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27 * file: |
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28 * |
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29 * Written by Martin Buchholz and Jason Mehrens with assistance from |
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30 * members of JCP JSR-166 Expert Group and released to the public |
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31 * domain, as explained at |
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32 * http://creativecommons.org/publicdomain/zero/1.0/ |
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33 */ |
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34 |
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35 /* |
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36 * @test |
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37 * @summary Only one thread should be created when a thread needs to |
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38 * be kept alive to service a delayed task waiting in the queue. |
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39 * @library /lib/testlibrary/ |
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40 */ |
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41 |
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42 import static java.util.concurrent.TimeUnit.MILLISECONDS; |
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43 |
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44 import java.util.concurrent.ScheduledThreadPoolExecutor; |
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45 import java.util.concurrent.ThreadFactory; |
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46 import java.util.concurrent.atomic.AtomicLong; |
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47 import jdk.testlibrary.Utils; |
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48 |
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49 public class ThreadRestarts { |
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50 static final long LONG_DELAY_MS = Utils.adjustTimeout(10_000); |
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51 static final long FAR_FUTURE_MS = 10 * LONG_DELAY_MS; |
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52 |
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53 public static void main(String[] args) throws Exception { |
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54 test(false); |
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55 test(true); |
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56 } |
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57 |
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58 private static void test(boolean allowTimeout) throws Exception { |
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59 CountingThreadFactory ctf = new CountingThreadFactory(); |
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60 ScheduledThreadPoolExecutor stpe |
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61 = new ScheduledThreadPoolExecutor(10, ctf); |
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62 try { |
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63 // schedule a dummy task in the "far future" |
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64 Runnable nop = new Runnable() { public void run() {}}; |
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65 stpe.schedule(nop, FAR_FUTURE_MS, MILLISECONDS); |
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66 stpe.setKeepAliveTime(1L, MILLISECONDS); |
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67 stpe.allowCoreThreadTimeOut(allowTimeout); |
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68 MILLISECONDS.sleep(12L); |
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69 } finally { |
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70 stpe.shutdownNow(); |
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71 if (!stpe.awaitTermination(LONG_DELAY_MS, MILLISECONDS)) |
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72 throw new AssertionError("timed out"); |
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73 } |
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74 if (ctf.count.get() > 1) |
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75 throw new AssertionError( |
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76 String.format("%d threads created, 1 expected", |
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77 ctf.count.get())); |
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78 } |
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79 |
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80 static class CountingThreadFactory implements ThreadFactory { |
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81 final AtomicLong count = new AtomicLong(0L); |
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82 |
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83 public Thread newThread(Runnable r) { |
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84 count.getAndIncrement(); |
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85 Thread t = new Thread(r); |
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86 t.setDaemon(true); |
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87 return t; |
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88 } |
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89 } |
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90 } |