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/*
* Copyright (c) 2021, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test
* @bug 8263903
* @requires vm.gc != "Epsilon"
* @summary Discarding a Timer causes the Timer thread to stop.
*/
import java.util.Timer;
import java.util.TimerTask;
import java.lang.ref.Reference;
public class AutoStop {
static final Object wakeup = new Object();
static Thread tdThread = null;
static volatile int counter = 0;
static final int COUNTER_LIMIT = 10;
public static void main(String[] args) throws Exception {
Timer t = new Timer();
// Run an event that records the timer thread.
t.schedule(new TimerTask() {
public void run() {
synchronized(wakeup) {
tdThread = Thread.currentThread();
wakeup.notify();
}
}
}, 0);
// Wait for the thread to be accessible.
try {
synchronized(wakeup) {
while (tdThread == null) {
wakeup.wait();
}
}
} catch (InterruptedException e) {
}
// Schedule some events that increment the counter.
for (int i = 0; i < COUNTER_LIMIT; ++i) {
t.schedule(new TimerTask() {
public void run() {
++counter;
}
}, 100);
}
// Ensure the timer is accessible at least until here.
Reference.reachabilityFence(t);
t = null; // Remove the reference to the timer.
System.gc(); // Run GC to trigger cleanup.
tdThread.join(); // Wait for thread to stop.
int finalCounter = counter;
if (finalCounter != COUNTER_LIMIT) {
throw new RuntimeException("Unrun events: counter = " + finalCounter);
}
}
}
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