/*
 * Copyright (c) 2014, 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.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * 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.
 */

package sun.awt.util;

A utility class needed to access the root ThreadGroup The class should not depend on any others, because it' called from JNI_OnLoad of the AWT native library. Triggering class loading could lead to a deadlock.
/** * A utility class needed to access the root {@code ThreadGroup} * * The class should not depend on any others, because it' called from JNI_OnLoad of the AWT * native library. Triggering class loading could lead to a deadlock. */
public final class ThreadGroupUtils { private ThreadGroupUtils() { // Avoid instantiation }
Returns a root thread group. Should be called with SecurityConstants.MODIFY_THREADGROUP_PERMISSION
Returns:a root ThreadGroup
/** * Returns a root thread group. * Should be called with {@link sun.security.util.SecurityConstants#MODIFY_THREADGROUP_PERMISSION} * * @return a root {@code ThreadGroup} */
public static ThreadGroup getRootThreadGroup() { ThreadGroup currentTG = Thread.currentThread().getThreadGroup(); ThreadGroup parentTG = currentTG.getParent(); while (parentTG != null) { currentTG = parentTG; parentTG = currentTG.getParent(); } return currentTG; } }