1 /*
   2  * Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 /**
  25  * @test
  26  * @bug 4619744
  27  * @summary Test that Process input/out can be concurrently read/written
  28  * @author kladko
  29  */
  30 
  31 import java.io.InputStream;
  32 import java.io.OutputStream;
  33 
  34 public class ConcurrentRead {
  35 
  36     static volatile Exception savedException;
  37 
  38     public static void main(String[] args) throws Exception {
  39         if (System.getProperty("os.name").startsWith("Windows")) {
  40             System.err.println("Not for Windows");
  41             return;
  42         }
  43         Process p = Runtime.getRuntime().exec(UnixCommands.tee());
  44         OutputStream out = p.getOutputStream();
  45         InputStream in = p.getInputStream();
  46         Thread t1 = new WriterThread(out, in);
  47         t1.start();
  48         Thread t2 = new WriterThread(out, in);
  49         t2.start();
  50         t1.join();
  51         t2.join();
  52         if (savedException != null)
  53             throw savedException;
  54     }
  55 
  56     static class WriterThread extends Thread {
  57         OutputStream out;
  58         InputStream in;
  59         WriterThread(OutputStream out, InputStream in) {
  60             this.out = out;
  61             this.in = in;
  62         }
  63         public void run(){
  64             try {
  65                 out.write('a');
  66                 out.flush();
  67                 if (in.read() == -1) // got end-of-stream
  68                     throw new Exception("End of stream in writer thread");
  69             } catch (Exception e) {
  70                 savedException = e;
  71             }
  72         }
  73     }
  74 }