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