| /* |
| * Copyright (c) 1998, 1999, 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 4146462 |
| * @summary Priority inversion prevents call to the genSeed method from |
| * returning |
| * |
| * if the test returns, then it passed. |
| * if the test never returns (hangs forever), then it failed. |
| * @key randomness |
| */ |
| |
| import java.security.SecureRandom; |
| |
| public class Priority_Inversion { |
| public static void main(String args[]) { |
| int deltaPriority = 1; |
| |
| if (args.length == 1) { |
| try { |
| deltaPriority = Integer.parseInt(args[0]); |
| } |
| catch (NumberFormatException nfe) { |
| System.err.println |
| ("Sorry, \"" + args[0] + "\" is not a number"); |
| System.exit(1); |
| } |
| } |
| |
| RandomTest rand = new RandomTest(); |
| InvertTest invert = new InvertTest(deltaPriority, rand); |
| rand.start(); |
| invert.start(); |
| } |
| } |
| |
| class RandomTest extends Thread { |
| public synchronized void run() { |
| System.out.println("Start priority " + getPriority()); |
| // The following should take over a second |
| SecureRandom rand = new SecureRandom(); |
| rand.nextBytes(new byte[5]); |
| } |
| |
| void invertPriority() { |
| System.out.println("Waiting ..., priority " + |
| Thread.currentThread().getPriority()); |
| synchronized(this) { |
| } |
| System.out.println("Released Lock"); |
| } |
| } |
| class InvertTest extends Thread { |
| private int delta; |
| private RandomTest rand; |
| |
| InvertTest(int delta, RandomTest rand) { |
| this.delta = delta; |
| this.rand = rand; |
| } |
| |
| public void run() { |
| setPriority(getPriority() + delta); |
| try { |
| sleep(500); |
| } |
| catch (InterruptedException ie) { } |
| rand.invertPriority(); |
| } |
| } |