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/*
* Copyright (c) 1999, 2024, 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 4212687
* @summary Verifies that calling EventQueue.push() and EventQueue.pop()
* does not deadlock.
* @library /java/awt/regtesthelpers
* @build PassFailJFrame
* @run main/manual PushPopDeadlock
*/
import java.awt.EventQueue;
import java.awt.Frame;
import java.awt.Label;
import java.awt.Robot;
import java.awt.Toolkit;
public class PushPopDeadlock {
static int counter = 0;
static Robot robot;
static Frame f;
static Label l;
public static void main(String[] args) throws Exception {
robot = new Robot();
String INSTRUCTIONS = """
Click rapidly in the Frame labeled 'Click Here!'.
The number in the Frame should continue to increase. If the number
stops increasing (remains at a constant value), the test fails.
""";
PassFailJFrame pfJFrame = PassFailJFrame.builder()
.title("Test Instructions")
.instructions(INSTRUCTIONS)
.rows((int) INSTRUCTIONS.lines().count() + 2)
.columns(35)
.testUI(PushPopDeadlock::createUI)
.build();
PushPopDeadlock.test();
pfJFrame.awaitAndCheck();
}
public static Frame createUI() {
f = new Frame("Click Here!");
l = new Label("Counter: " + counter);
f.add(l);
f.setSize(200, 200);
return f;
}
public static void test() {
EventQueue q = new EventQueue() {
public void push(EventQueue queue) {
super.push(queue);
pop();
}
};
EventQueue q2 = new EventQueue();
Toolkit.getDefaultToolkit().getSystemEventQueue().push(q);
new Thread(() -> {
while (true) {
robot.delay(500);
l.setText("Counter: " + ++counter);
q.push(q2);
try {
Thread.currentThread().sleep(500);
} catch (InterruptedException e) {
return;
}
}
}).start();
}
}
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