Atomically clears a bit (or bits) for an AtomicInteger. - Java java.util.concurrent.atomic

Java examples for java.util.concurrent.atomic:AtomicInteger

Description

Atomically clears a bit (or bits) for an AtomicInteger.

Demo Code

/*//  ww w .j  a  v  a2s. c o  m
 * This file is part of Spout.
 *
 * Copyright (c) 2011 Spout LLC <http://www.spout.org/>
 * Spout is licensed under the Spout License Version 1.
 *
 * Spout is free software: you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation, either version 3 of the License, or (at your option)
 * any later version.
 *
 * In addition, 180 days after any changes are published, you can use the
 * software, incorporating those changes, under the terms of the MIT license,
 * as described in the Spout License Version 1.
 *
 * Spout 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 Lesser General Public License for
 * more details.
 *
 * You should have received a copy of the GNU Lesser General Public License,
 * the MIT license and the Spout License Version 1 along with this program.
 * If not, see <http://www.gnu.org/licenses/> for the GNU Lesser General Public
 * License and see <http://spout.in/licensev1> for the full license, including
 * the MIT license.
 */
//package com.java2s;
import java.util.concurrent.atomic.AtomicInteger;

public class Main {
    /**
     * Atomically clears a bit (or bits) for an AtomicInteger.  If the bit(s) are already cleared, the method returns false<br> If any of the bits are zero, then the method will fail and clear none of
     * the bits
     *
     * @param i the AtomicInteger
     * @param mask the bits to clear should be ones
     * @return false if the bit were successfully cleared
     */
    public static boolean clearBit(AtomicInteger i, int mask) {
        boolean success = false;
        while (!success) {
            int current = i.get();
            if ((current & mask) != mask) {
                return false;
            }
            int next = current & (~mask);
            success = i.compareAndSet(current, next);
        }
        return true;
    }
}

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