1 /*
   2  * Copyright (c) 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 7091003
  27  * @summary ScheduledExecutorService never executes Runnable
  28  *          with corePoolSize of zero
  29  * @library /lib/testlibrary/
  30  * @author Chris Hegarty
  31  */
  32 
  33 import static java.util.concurrent.TimeUnit.MILLISECONDS;
  34 
  35 import java.util.concurrent.ScheduledThreadPoolExecutor;
  36 import jdk.testlibrary.Utils;
  37 
  38 /**
  39  * Verify that tasks can be run even with a core pool size of 0.
  40  */
  41 public class ZeroCorePoolSize {
  42     static final long LONG_DELAY_MS = Utils.adjustTimeout(10_000);
  43 
  44     volatile boolean taskRun;
  45 
  46     void test(String[] args) throws Throwable {
  47 
  48         ScheduledThreadPoolExecutor pool = new ScheduledThreadPoolExecutor(0);
  49         Runnable task = new Runnable() {
  50             public void run() {
  51                 taskRun = true;
  52             }
  53         };
  54         check(pool.getCorePoolSize() == 0);
  55 
  56         pool.schedule(task, 12L, MILLISECONDS);
  57 
  58         pool.shutdown();
  59         check(pool.awaitTermination(LONG_DELAY_MS, MILLISECONDS));
  60         check(pool.getCorePoolSize() == 0);
  61         check(taskRun);
  62     }
  63 
  64     //--------------------- Infrastructure ---------------------------
  65     volatile int passed = 0, failed = 0;
  66     void pass() {passed++;}
  67     void fail() {failed++; Thread.dumpStack();}
  68     void fail(String msg) {System.err.println(msg); fail();}
  69     void unexpected(Throwable t) {failed++; t.printStackTrace();}
  70     void check(boolean cond) {if (cond) pass(); else fail();}
  71     void equal(Object x, Object y) {
  72         if (x == null ? y == null : x.equals(y)) pass();
  73         else fail(x + " not equal to " + y);}
  74     public static void main(String[] args) throws Throwable {
  75         new ZeroCorePoolSize().instanceMain(args);}
  76     void instanceMain(String[] args) throws Throwable {
  77         try {test(args);} catch (Throwable t) {unexpected(t);}
  78         System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
  79         if (failed > 0) throw new AssertionError("Some tests failed");}
  80     abstract class F {abstract void f() throws Throwable;}
  81     void THROWS(Class<? extends Throwable> k, F... fs) {
  82         for (F f : fs)
  83             try {f.f(); fail("Expected " + k.getName() + " not thrown");}
  84             catch (Throwable t) {
  85                 if (k.isAssignableFrom(t.getClass())) pass();
  86                 else unexpected(t);}}
  87 }