85 lines
2.8 KiB
Java
85 lines
2.8 KiB
Java
/*
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* Copyright (c) 2021, Oracle and/or its affiliates. All rights reserved.
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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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* @test
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* @bug 8263903
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* @requires vm.gc != "Epsilon"
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* @summary Discarding a Timer causes the Timer thread to stop.
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*/
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import java.util.Timer;
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import java.util.TimerTask;
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import java.lang.ref.Reference;
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public class AutoStop {
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static final Object wakeup = new Object();
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static Thread tdThread = null;
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static volatile int counter = 0;
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static final int COUNTER_LIMIT = 10;
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public static void main(String[] args) throws Exception {
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Timer t = new Timer();
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// Run an event that records the timer thread.
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t.schedule(new TimerTask() {
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public void run() {
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synchronized(wakeup) {
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tdThread = Thread.currentThread();
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wakeup.notify();
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}
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}
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}, 0);
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// Wait for the thread to be accessible.
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try {
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synchronized(wakeup) {
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while (tdThread == null) {
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wakeup.wait();
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}
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}
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} catch (InterruptedException e) {
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}
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// Schedule some events that increment the counter.
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for (int i = 0; i < COUNTER_LIMIT; ++i) {
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t.schedule(new TimerTask() {
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public void run() {
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++counter;
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}
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}, 100);
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}
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// Ensure the timer is accessible at least until here.
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Reference.reachabilityFence(t);
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t = null; // Remove the reference to the timer.
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System.gc(); // Run GC to trigger cleanup.
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tdThread.join(); // Wait for thread to stop.
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int finalCounter = counter;
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if (finalCounter != COUNTER_LIMIT) {
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throw new RuntimeException("Unrun events: counter = " + finalCounter);
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}
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}
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}
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