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/*
* Copyright (c) 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 8336339
* @summary Race registration and selection key updates with Selector.close
* @run junit RaceUpdatesAndClose
*/
import java.nio.channels.CancelledKeyException;
import java.nio.channels.ClosedSelectorException;
import java.nio.channels.DatagramChannel;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Phaser;
import org.junit.jupiter.api.BeforeAll;
import org.junit.jupiter.api.AfterAll;
import org.junit.jupiter.api.RepeatedTest;
class RaceUpdatesAndClose {
private static ExecutorService executor;
@BeforeAll
static void setup() throws Exception {
executor = Executors.newFixedThreadPool(2);
}
@AfterAll
static void finish() {
executor.shutdown();
}
/**
* Race SelectableChannel.register and Selector.close.
*/
@RepeatedTest(100)
void raceRegisterAndClose() throws Exception {
try (Selector sel = Selector.open();
DatagramChannel dc = DatagramChannel.open()) {
dc.configureBlocking(false);
Phaser phaser = new Phaser(2);
// register
var task1 = executor.submit(() -> {
phaser.arriveAndAwaitAdvance();
try {
dc.register(sel, SelectionKey.OP_READ);
} catch (ClosedSelectorException e) { }
return null;
});
// close selector
var task2 = executor.submit(() -> {
phaser.arriveAndAwaitAdvance();
sel.close();
return null;
});
task1.get();
task2.get();
}
}
/**
* Race SelectionKey.interestOps and Selector.close.
*/
@RepeatedTest(100)
void raceInterestOpsAndClose() throws Exception {
try (Selector sel = Selector.open();
DatagramChannel dc = DatagramChannel.open()) {
dc.configureBlocking(false);
SelectionKey key = dc.register(sel, SelectionKey.OP_READ);
Phaser phaser = new Phaser(2);
// interestOps
var task1 = executor.submit(() -> {
phaser.arriveAndAwaitAdvance();
try {
key.interestOps(0);
} catch (CancelledKeyException e) { }
});
// close selector
var task2 = executor.submit(() -> {
phaser.arriveAndAwaitAdvance();
sel.close();
return null;
});
task1.get();
task2.get();
}
}
}
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