/*
* 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.
*
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*/
/*
* @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.
*/
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();
}
}