1 /* 2 * Copyright (c) 2011, 2018, 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 /test/lib 30 * @author Chris Hegarty 31 */ 32 33 import static java.util.concurrent.TimeUnit.MILLISECONDS; 34 35 import java.util.concurrent.ScheduledThreadPoolExecutor; 36 import jdk.test.lib.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 test(String[] args)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; pass()66 void pass() {passed++;} fail()67 void fail() {failed++; Thread.dumpStack();} fail(String msg)68 void fail(String msg) {System.err.println(msg); fail();} unexpected(Throwable t)69 void unexpected(Throwable t) {failed++; t.printStackTrace();} check(boolean cond)70 void check(boolean cond) {if (cond) pass(); else fail();} equal(Object x, Object y)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);} main(String[] args)74 public static void main(String[] args) throws Throwable { 75 new ZeroCorePoolSize().instanceMain(args);} instanceMain(String[] 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");} f()80 abstract class F {abstract void f() throws Throwable;} THROWS(Class<? extends Throwable> k, F... fs)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 } 88