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
31import java.io.InputStream;
32import java.io.OutputStream;
33
34public class ConcurrentRead {
35
36    static volatile Exception savedException;
37
38    public static void main(String[] args) throws Exception {
39        if (! UnixCommands.isUnix) {
40            System.out.println("For UNIX only");
41            return;
42        }
43        UnixCommands.ensureCommandsAvailable("tee");
44
45        Process p = Runtime.getRuntime().exec(UnixCommands.tee());
46        OutputStream out = p.getOutputStream();
47        InputStream in = p.getInputStream();
48        Thread t1 = new WriterThread(out, in);
49        t1.start();
50        Thread t2 = new WriterThread(out, in);
51        t2.start();
52        t1.join();
53        t2.join();
54        if (savedException != null)
55            throw savedException;
56    }
57
58    static class WriterThread extends Thread {
59        OutputStream out;
60        InputStream in;
61        WriterThread(OutputStream out, InputStream in) {
62            this.out = out;
63            this.in = in;
64        }
65        public void run(){
66            try {
67                out.write('a');
68                out.flush();
69                if (in.read() == -1) // got end-of-stream
70                    throw new Exception("End of stream in writer thread");
71            } catch (Exception e) {
72                savedException = e;
73            }
74        }
75    }
76}
77