128 lines
4.7 KiB
Java
128 lines
4.7 KiB
Java
/*
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* Copyright (c) 2018, 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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/* @test
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* @bug 8198928
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* @library /test/lib
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* @build jdk.test.lib.Utils
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* @run main CloseDuringConnect
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* @summary Attempt to cause a deadlock by closing a SocketChannel in one thread
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* where another thread is closing the channel after a connect fail
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*/
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import java.io.IOException;
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import java.io.UncheckedIOException;
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import java.net.InetAddress;
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import java.net.InetSocketAddress;
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import java.net.SocketAddress;
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import java.nio.channels.SocketChannel;
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import java.util.concurrent.Executors;
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import java.util.concurrent.Future;
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import java.util.concurrent.ScheduledExecutorService;
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import java.util.stream.IntStream;
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import static java.util.concurrent.TimeUnit.MILLISECONDS;
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import jdk.test.lib.Utils;
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public class CloseDuringConnect {
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// number of test iterations, needs to be 5-10 at least
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static final int ITERATIONS = 50;
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// maximum delay before closing SocketChannel, in milliseconds
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static final int MAX_DELAY_BEFORE_CLOSE = 20;
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/**
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* Invoked by a task in the thread pool to connect to a remote address.
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* The connection should never be established.
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*/
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static Void connect(SocketChannel sc, SocketAddress remote) {
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try {
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if (!sc.connect(remote)) {
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while (!sc.finishConnect()) {
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Thread.yield();
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}
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}
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throw new RuntimeException("Connected, should not happen");
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} catch (IOException expected) { }
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if (sc.isConnected())
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throw new RuntimeException("isConnected return true, should not happen");
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return null;
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}
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/**
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* Invoked by a task in the thread pool to close a socket channel.
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*/
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static Void close(SocketChannel sc) {
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try {
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sc.close();
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} catch (IOException e) {
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throw new UncheckedIOException("close failed", e);
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}
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return null;
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}
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/**
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* Test for deadlock by submitting a task to connect to the given address
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* while another task closes the socket channel.
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* @param pool the thread pool to submit or schedule tasks
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* @param remote the remote address, does not accept connections
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* @param blocking socket channel blocking mode
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* @param delay the delay, in millis, before closing the channel
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*/
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static void test(ScheduledExecutorService pool,
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SocketAddress remote,
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boolean blocking,
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long delay) {
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try {
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SocketChannel sc = SocketChannel.open();
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sc.configureBlocking(blocking);
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Future<Void> r1 = pool.submit(() -> connect(sc, remote));
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Future<Void> r2 = pool.schedule(() -> close(sc), delay, MILLISECONDS);
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r1.get();
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r2.get();
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} catch (Throwable t) {
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throw new RuntimeException("Test failed", t);
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}
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}
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public static void main(String[] args) throws Exception {
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SocketAddress refusing = Utils.refusingEndpoint();
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ScheduledExecutorService pool = Executors.newScheduledThreadPool(2);
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try {
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IntStream.range(0, ITERATIONS).forEach(i -> {
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System.out.format("Iteration %d ...%n", (i + 1));
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// Execute the test for varying delays up to MAX_DELAY_BEFORE_CLOSE,
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// for socket channels configured both blocking and non-blocking
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IntStream.range(0, MAX_DELAY_BEFORE_CLOSE).forEach(delay -> {
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test(pool, refusing, /*blocking mode*/true, delay);
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test(pool, refusing, /*blocking mode*/false, delay);
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});
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});
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} finally {
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pool.shutdown();
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}
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}
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}
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