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 import java.io.File; 34 import java.io.IOException; 35 36 public class ConcurrentRead { 37 38 static volatile Exception savedException; 39 static final String TEE = "/usr/bin/tee"; 40 41 public static void main(String[] args) throws Exception { 42 43 if (File.separatorChar == '\\' || // Windows 44 !new File(TEE).exists()) // no tee 45 return; 46 47 Process p = Runtime.getRuntime().exec(TEE); 48 OutputStream out = p.getOutputStream(); 49 InputStream in = p.getInputStream(); 50 Thread t1 = new WriterThread(out, in); 51 t1.start(); 52 Thread t2 = new WriterThread(out, in); 53 t2.start(); 54 t1.join(); 55 t2.join(); 56 if (savedException != null) 57 throw savedException; 58 } 59 60 static class WriterThread extends Thread { 61 OutputStream out; 62 InputStream in; 63 WriterThread(OutputStream out, InputStream in) { 64 this.out = out; 65 this.in = in; 66 } 67 public void run(){ 68 try { 69 out.write('a'); 70 out.flush(); 71 if (in.read() == -1) // got end-of-stream 72 throw new Exception("End of stream in writer thread"); 73 } catch (Exception e) { 74 savedException = e; 75 } 76 } 77 } 78 }