/*

 * 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.misc;

/**

 * A thread that has it's thread locals, and inheritable thread

 * locals erased on construction.

 */

public class ManagedLocalsThread extends Thread {

    private static final Unsafe UNSAFE;

    private static final long THREAD_LOCALS;

    private static final long INHERITABLE_THREAD_LOCALS;

    public ManagedLocalsThread() {

        eraseThreadLocals();

    }

    public ManagedLocalsThread(Runnable target) {

        super(target);

        eraseThreadLocals();

    }

    public ManagedLocalsThread(String name) {

        super(name);

        eraseThreadLocals();

    }

    public ManagedLocalsThread(Runnable target, String name) {

        super(target, name);

        eraseThreadLocals();

    }

    public ManagedLocalsThread(ThreadGroup group, String name) {

        super(group, name);

        eraseThreadLocals();

    }

    public ManagedLocalsThread(ThreadGroup group, Runnable target, String name) {

        super(group, target, name);

        eraseThreadLocals();

    }

    /**

     * Drops all thread locals (and inherited thread locals).

     */

    public final void eraseThreadLocals() {

        UNSAFE.putObject(this, THREAD_LOCALS, null);

        UNSAFE.putObject(this, INHERITABLE_THREAD_LOCALS, null);

    }

    static {

        UNSAFE = Unsafe.getUnsafe();

        Class<?> t = Thread.class;

        try {

            THREAD_LOCALS = UNSAFE.objectFieldOffset

                (t.getDeclaredField("threadLocals"));

            INHERITABLE_THREAD_LOCALS = UNSAFE.objectFieldOffset

                (t.getDeclaredField("inheritableThreadLocals"));

        } catch (Exception e) {

            throw new Error(e);

        }

    }

}