103 lines
3.4 KiB
Java
103 lines
3.4 KiB
Java
/*
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* Copyright (c) 2009, 2010, 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 6543863 6842687
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* @summary Try to cause a deadlock between (Asynchronous)FileChannel.close
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* and FileLock.release
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*/
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import java.io.*;
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import java.nio.file.Path;
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import static java.nio.file.StandardOpenOption.*;
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import java.nio.channels.*;
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import java.util.concurrent.*;
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public class ReleaseOnCloseDeadlock {
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private static final int LOCK_COUNT = 1024;
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public static void main(String[] args) throws IOException {
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File blah = File.createTempFile("blah", null);
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blah.deleteOnExit();
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try {
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for (int i=0; i<100; i++) {
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test(blah.toPath());
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}
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} finally {
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blah.delete();
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}
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}
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static void test(Path file) throws IOException {
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FileLock[] locks = new FileLock[LOCK_COUNT];
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FileChannel fc = FileChannel.open(file, READ, WRITE);
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for (int i=0; i<LOCK_COUNT; i++) {
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locks[i] = fc.lock(i, 1, true);
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}
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tryToDeadlock(fc, locks);
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AsynchronousFileChannel ch = AsynchronousFileChannel.open(file, READ, WRITE);
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for (int i=0; i<LOCK_COUNT; i++) {
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try {
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locks[i] = ch.lock(i, 1, true).get();
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} catch (InterruptedException x) {
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throw new RuntimeException(x);
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} catch (ExecutionException x) {
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throw new RuntimeException(x);
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}
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}
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tryToDeadlock(ch, locks);
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}
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static void tryToDeadlock(final Channel channel, FileLock[] locks)
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throws IOException
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{
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// start thread to close the file (and invalidate the locks)
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Thread closer = new Thread(
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new Runnable() {
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public void run() {
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try {
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channel.close();
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} catch (IOException ignore) {
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ignore.printStackTrace();
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}
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}});
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closer.start();
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// release the locks explicitly
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for (int i=0; i<locks.length; i++) {
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try {
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locks[i].release();
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} catch (ClosedChannelException ignore) { }
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}
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// we are done when closer has terminated
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while (closer.isAlive()) {
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try {
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closer.join();
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} catch (InterruptedException ignore) { }
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}
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}
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}
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