| /* |
| * Copyright (c) 2003, 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 4499763 |
| * @summary Check for race condition between close and available |
| */ |
| |
| import java.io.*; |
| |
| /* |
| * Note: this is a probabalistic test and will not always fail on |
| * a workspace where the race condition can occur. However it should |
| * never fail on a workspace where the bug has been fixed. |
| */ |
| public class CloseAndAvailableRC { |
| public static void main(final String[] args) throws Exception { |
| CloseAndAvailableRC rc = new CloseAndAvailableRC(); |
| rc.go(); |
| } |
| |
| private PipedInputStream inPipe = null; |
| private PipedOutputStream outPipe = null; |
| private Thread sink = null; |
| private volatile boolean stop = false; |
| private volatile boolean stopTest = false; |
| |
| private void go() throws Exception { |
| for (long i=0; i<2000; i++) { |
| if (stopTest) { |
| cleanup(); |
| throw new RuntimeException("Test failed"); |
| } |
| resetPipes(); |
| System.err.println("Closing..."); |
| inPipe.close(); |
| } |
| cleanup(); |
| } |
| |
| // Cleanup old threads |
| private void cleanup() throws Exception { |
| if (sink != null) { |
| stop = true; |
| sink.interrupt(); |
| try { |
| sink.join(); |
| } catch (InterruptedException e) { |
| } |
| stop = false; |
| // Input Stream will have been closed already |
| outPipe.close(); |
| } |
| } |
| |
| private void resetPipes() throws Exception { |
| cleanup(); |
| |
| // Init pipe; Note: output never read |
| inPipe = new PipedInputStream(); |
| outPipe = new PipedOutputStream(inPipe); |
| |
| // Put stuff in pipe so that available() > 0 |
| for (byte b = 0; b < 10; b++) |
| outPipe.write(b); |
| |
| sink = new Sink(); |
| sink.start(); |
| } |
| |
| private class Sink extends Thread { |
| public void run() { |
| while (!stop) { |
| try { |
| final int num = inPipe.available(); |
| if (num < 0) { |
| // Bug detected; stop the test |
| stopTest = true; |
| } |
| } catch (final IOException e) { |
| System.err.println("Error on available:" + e.getMessage()); |
| e.printStackTrace(System.err); |
| } |
| } |
| } |
| } |
| } |