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/*
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* Copyright (c) 1998, 1999, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 4146462
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* @summary Priority inversion prevents call to the genSeed method from
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* returning
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*
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* if the test returns, then it passed.
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* if the test never returns (hangs forever), then it failed.
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*/
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import java.security.SecureRandom;
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public class Priority_Inversion {
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public static void main(String args[]) {
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int deltaPriority = 1;
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if (args.length == 1) {
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try {
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deltaPriority = Integer.parseInt(args[0]);
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}
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catch (NumberFormatException nfe) {
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System.err.println
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("Sorry, \"" + args[0] + "\" is not a number");
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System.exit(1);
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}
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}
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RandomTest rand = new RandomTest();
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InvertTest invert = new InvertTest(deltaPriority, rand);
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rand.start();
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invert.start();
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}
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}
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class RandomTest extends Thread {
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public synchronized void run() {
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System.out.println("Start priority " + getPriority());
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// The following should take over a second
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SecureRandom rand = new SecureRandom();
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rand.nextBytes(new byte[5]);
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}
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void invertPriority() {
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System.out.println("Waiting ..., priority " +
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Thread.currentThread().getPriority());
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synchronized(this) {
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}
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System.out.println("Released Lock");
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}
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}
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class InvertTest extends Thread {
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private int delta;
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private RandomTest rand;
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InvertTest(int delta, RandomTest rand) {
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this.delta = delta;
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this.rand = rand;
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}
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public void run() {
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setPriority(getPriority() + delta);
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try {
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sleep(500);
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}
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catch (InterruptedException ie) { }
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rand.invertPriority();
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}
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}
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