Java AtomicInteger countDownToZero(AtomicInteger counter)

Description

Decreases counter to zero, or does not change the counter if negative.

License

Apache License

Parameter

Parameter	Description
counter	atomic counter

Return

true if this Thread modified concurrent counter from any positive number down to zero.

Declaration

@SuppressWarnings("checkstyle:emptyforiteratorpad")
public static boolean countDownToZero(AtomicInteger counter) 

Method Source Code

//package com.java2s;
/*/*ww w.ja  va  2  s  .c  o m*/
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

import java.util.concurrent.atomic.AtomicInteger;

public class Main {
    /**
     * Decreases {@code counter} to zero, or does not change the counter if negative.
     * This method pretends been atomic. Only one thread can succeed setting the counter to zero.
     *
     * @param counter atomic counter
     * @return {@code true} if this Thread modified concurrent counter from any positive number down to zero.
     */
    @SuppressWarnings("checkstyle:emptyforiteratorpad")
    public static boolean countDownToZero(AtomicInteger counter) {
        for (;;) {
            int c = counter.get();
            if (c > 0) {
                int newCounter = c - 1;
                if (counter.compareAndSet(c, newCounter)) {
                    return newCounter == 0;
                }
            } else {
                return false;
            }
        }
    }
}

Related

1. addNodeUse(String nodeInfo)
2. bitwiseOrAndGet(final AtomicInteger ai, final int toOrValue)
3. count()
4. count(byte[] array, byte value)
5. countOccurrences(final Collection collection)
6. create()
7. createIdentifier(Class clazz)
8. createNewTestNamespace( Map environmentProperties)