91 lines
3.3 KiB
Java
91 lines
3.3 KiB
Java
/*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* This file is available under and governed by the GNU General Public
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* License version 2 only, as published by the Free Software Foundation.
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* However, the following notice accompanied the original version of this
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* file:
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*
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* Written by Martin Buchholz and Jason Mehrens with assistance from
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* members of JCP JSR-166 Expert Group and released to the public
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* domain, as explained at
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* http://creativecommons.org/publicdomain/zero/1.0/
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*/
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/*
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* @test
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* @summary Only one thread should be created when a thread needs to
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* be kept alive to service a delayed task waiting in the queue.
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* @library /test/lib
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*/
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import static java.util.concurrent.TimeUnit.MILLISECONDS;
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import java.util.concurrent.ScheduledThreadPoolExecutor;
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import java.util.concurrent.ThreadFactory;
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import java.util.concurrent.atomic.AtomicLong;
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import jdk.test.lib.Utils;
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public class ThreadRestarts {
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static final long LONG_DELAY_MS = Utils.adjustTimeout(10_000);
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static final long FAR_FUTURE_MS = 10 * LONG_DELAY_MS;
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public static void main(String[] args) throws Exception {
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test(false);
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test(true);
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}
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private static void test(boolean allowTimeout) throws Exception {
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CountingThreadFactory ctf = new CountingThreadFactory();
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ScheduledThreadPoolExecutor stpe
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= new ScheduledThreadPoolExecutor(10, ctf);
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try {
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// schedule a dummy task in the "far future"
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Runnable nop = new Runnable() { public void run() {}};
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stpe.schedule(nop, FAR_FUTURE_MS, MILLISECONDS);
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stpe.setKeepAliveTime(1L, MILLISECONDS);
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stpe.allowCoreThreadTimeOut(allowTimeout);
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MILLISECONDS.sleep(12L);
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} finally {
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stpe.shutdownNow();
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if (!stpe.awaitTermination(LONG_DELAY_MS, MILLISECONDS))
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throw new AssertionError("timed out");
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}
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if (ctf.count.get() > 1)
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throw new AssertionError(
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String.format("%d threads created, 1 expected",
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ctf.count.get()));
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}
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static class CountingThreadFactory implements ThreadFactory {
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final AtomicLong count = new AtomicLong(0L);
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public Thread newThread(Runnable r) {
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count.getAndIncrement();
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Thread t = new Thread(r);
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t.setDaemon(true);
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return t;
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}
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}
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}
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