| /* |
| * Copyright (c) 2010, 2011, 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 6979009 |
| * @summary Ensure ClosedByInterruptException is thrown when I/O operation |
| * interrupted by Thread.interrupt |
| * @key randomness |
| */ |
| |
| import java.io.*; |
| import java.util.Random; |
| import java.nio.ByteBuffer; |
| import java.nio.channels.*; |
| |
| public class ClosedByInterrupt { |
| |
| static final int K = 1024; |
| static final Random rand = new Random(); |
| |
| static volatile boolean failed; |
| |
| public static void main(String[] args) throws Exception { |
| File f = File.createTempFile("blah", null); |
| f.deleteOnExit(); |
| |
| // create 1MB file. |
| byte[] b = new byte[K*K]; |
| rand.nextBytes(b); |
| ByteBuffer bb = ByteBuffer.wrap(b); |
| try (FileChannel fc = new FileOutputStream(f).getChannel()) { |
| while (bb.hasRemaining()) |
| fc.write(bb); |
| } |
| |
| // test with 1-16 concurrent threads |
| for (int i=1; i<=16; i++) { |
| System.out.format("%d thread(s)%n", i); |
| test(f, i); |
| if (failed) |
| break; |
| } |
| |
| if (failed) |
| throw new RuntimeException("Test failed"); |
| } |
| |
| /** |
| * Starts "nThreads" that do I/O on the given file concurrently. Continuously |
| * interrupts one of the threads to cause the file to be closed and |
| * ClosedByInterruptException to be thrown. The other threads should "fail" with |
| * ClosedChannelException (or the more specific AsynchronousCloseException). |
| */ |
| static void test(File f, int nThreads) throws Exception { |
| try (FileChannel fc = new RandomAccessFile(f, "rwd").getChannel()) { |
| Thread[] threads = new Thread[nThreads]; |
| |
| // start threads |
| for (int i=0; i<nThreads; i++) { |
| boolean interruptible = (i==0); |
| ReaderWriter task = new ReaderWriter(fc, interruptible); |
| Thread t = new Thread(task); |
| t.start(); |
| threads[i] = t; |
| } |
| |
| // give time for threads to start |
| Thread.sleep(500 + rand.nextInt(1000)); |
| |
| // interrupt thread until channel is closed |
| while (fc.isOpen()) { |
| threads[0].interrupt(); |
| Thread.sleep(rand.nextInt(50)); |
| } |
| |
| // wait for test to finish |
| for (int i=0; i<nThreads; i++) { |
| threads[i].join(); |
| } |
| } |
| } |
| |
| /** |
| * A task that continuously reads or writes to random areas of a file |
| * until the channel is closed. An "interruptible" task expects the |
| * channel to be closed by an interupt, a "non-interruptible" thread |
| * does not. |
| */ |
| static class ReaderWriter implements Runnable { |
| final FileChannel fc; |
| final boolean interruptible; |
| final boolean writer; |
| |
| ReaderWriter(FileChannel fc, boolean interruptible) { |
| this.fc = fc; |
| this.interruptible = interruptible; |
| this.writer = rand.nextBoolean(); |
| } |
| |
| public void run() { |
| ByteBuffer bb = ByteBuffer.allocate(K); |
| if (writer) |
| rand.nextBytes(bb.array()); |
| |
| try { |
| for (;;) { |
| long position = rand.nextInt(K*K - bb.capacity()); |
| if (writer) { |
| bb.position(0).limit(bb.capacity()); |
| fc.write(bb, position); |
| } else { |
| bb.clear(); |
| fc.read(bb, position); |
| } |
| if (!interruptible) { |
| // give the interruptible thread a chance |
| try { |
| Thread.sleep(rand.nextInt(50)); |
| } catch (InterruptedException e) { |
| unexpected(e); |
| } |
| } |
| } |
| } catch (ClosedByInterruptException e) { |
| if (interruptible) { |
| if (Thread.interrupted()) { |
| expected(e + " thrown and interrupt status set"); |
| } else { |
| unexpected(e + " thrown but interrupt status not set"); |
| } |
| } else { |
| unexpected(e); |
| } |
| } catch (ClosedChannelException e) { |
| if (interruptible) { |
| unexpected(e); |
| } else { |
| expected(e); |
| } |
| } catch (Exception e) { |
| unexpected(e); |
| } |
| } |
| } |
| |
| static void expected(Exception e) { |
| System.out.format("%s (expected)%n", e); |
| } |
| |
| static void expected(String msg) { |
| System.out.format("%s (expected)%n", msg); |
| } |
| |
| static void unexpected(Exception e) { |
| System.err.format("%s (not expected)%n", e); |
| failed = true; |
| } |
| |
| static void unexpected(String msg) { |
| System.err.println(msg); |
| failed = true; |
| } |
| } |