/*
 * Copyright 2007 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 */

/*
 * @test @(#)SetMaxPriority.java	1.1 07/06/06
 * @bug 4708197 6497629
 * @summary Test for max priority setting that matches spec
 * @author Pete Soper
 */

public class SetMaxPriority {

    public static void main(String args[]) throws Exception {
        ThreadGroup tg = new ThreadGroup("foo");
	ThreadGroup ptg = tg.getParent();
	int currentMaxPriority = tg.getMaxPriority();
	int halfMaxPriority = ptg.getMaxPriority() / 2;
	if (halfMaxPriority - Thread.MIN_PRIORITY < 2) {
	    throw new RuntimeException("SetMaxPriority test no longer valid: starting parent max priority too close to Thread.MIN_PRIORITY");
	}
	tg.setMaxPriority(halfMaxPriority - 2);
	currentMaxPriority = tg.getMaxPriority();
	if (currentMaxPriority != halfMaxPriority - 2) {
	    throw new RuntimeException("SetMaxPriority failed: max priority not changed");
	}
	
	// This will fail if bug 6497629 is present because the min tests is
	// being made with the (just lowered) max instead of the parent max,
	// preventing the priority from being moved back up.
	tg.setMaxPriority(currentMaxPriority + 1);
	int newMaxPriority = tg.getMaxPriority();
	if (newMaxPriority != currentMaxPriority + 1) {
	    throw new RuntimeException("SetMaxPriority failed: defect 6497629 present");
	}

	// Confirm that max priorities out of range on both ends have no
	// effect.
	for (int badPriority : new int[] {Thread.MIN_PRIORITY - 1,
					  Thread.MAX_PRIORITY + 1}) {
	    int oldPriority = tg.getMaxPriority();
	    tg.setMaxPriority(badPriority);
	    if (oldPriority != tg.getMaxPriority())
		throw new RuntimeException(
		    "setMaxPriority bad arg not ignored as specified");
	}

	System.out.println("SetMaxPriority passed");
    }
}