| /* |
| * Copyright 2009 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| * CA 95054 USA or visit www.sun.com if you need additional information or |
| * have any questions. |
| */ |
| |
| /* @test |
| * @bug 6543863 |
| * @summary Try to cause a deadlock between (Asynchronous)FileChannel.close |
| * and FileLock.release |
| */ |
| |
| import java.io.*; |
| import java.nio.file.Path; |
| import static java.nio.file.StandardOpenOption.*; |
| import java.nio.channels.*; |
| import java.util.concurrent.*; |
| |
| public class ReleaseOnCloseDeadlock { |
| private static final int LOCK_COUNT = 1024; |
| |
| public static void main(String[] args) throws IOException { |
| File blah = File.createTempFile("blah", null); |
| blah.deleteOnExit(); |
| for (int i=0; i<100; i++) { |
| test(blah.toPath()); |
| } |
| } |
| |
| static void test(Path file) throws IOException { |
| FileLock[] locks = new FileLock[LOCK_COUNT]; |
| |
| FileChannel fc = FileChannel.open(file, READ, WRITE); |
| for (int i=0; i<LOCK_COUNT; i++) { |
| locks[i] = fc.lock(i, 1, true); |
| } |
| tryToDeadlock(fc, locks); |
| |
| AsynchronousFileChannel ch = AsynchronousFileChannel.open(file, READ, WRITE); |
| for (int i=0; i<LOCK_COUNT; i++) { |
| try { |
| locks[i] = ch.lock(i, 1, true, null, null).get(); |
| } catch (InterruptedException x) { |
| throw new RuntimeException(x); |
| } catch (ExecutionException x) { |
| throw new RuntimeException(x); |
| } |
| } |
| tryToDeadlock(ch, locks); |
| } |
| |
| static void tryToDeadlock(final Channel channel, FileLock[] locks) |
| throws IOException |
| { |
| // start thread to close the file (and invalidate the locks) |
| Thread closer = new Thread( |
| new Runnable() { |
| public void run() { |
| try { |
| channel.close(); |
| } catch (IOException ignore) { |
| ignore.printStackTrace(); |
| } |
| }}); |
| closer.start(); |
| |
| // release the locks explicitly |
| for (int i=0; i<locks.length; i++) { |
| try { |
| locks[i].release(); |
| } catch (ClosedChannelException ignore) { } |
| } |
| |
| // we are done when closer has terminated |
| while (closer.isAlive()) { |
| try { |
| closer.join(); |
| } catch (InterruptedException ignore) { } |
| } |
| } |
| } |