set AtomicInteger Bit If Unset By Index - Java java.util.concurrent.atomic

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

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Description

set AtomicInteger Bit If Unset By Index

Demo Code


//package com.java2s;
import java.util.concurrent.atomic.AtomicInteger;

public class Main {
    /**//from ww w  . ja  v  a2 s .c o m
     * @return true if operation is conducted, false if the bit is already set.
     * @param ai the AtomicInteger to operate on
     * @param n the nth bit from the least significant bit to compare
     * */
    public static boolean setBitIfUnsetByIndex(final AtomicInteger ai,
            final int n) {
        if (n >= Integer.SIZE) {
            throw new IllegalArgumentException(
                    "Out of int bit index boundary (31)");
        }
        int bitInt = 1 << n;
        int oldValue = ai.get();
        int newValue = oldValue | bitInt;
        while (newValue != oldValue
                && !ai.compareAndSet(oldValue, newValue)) {
            oldValue = ai.get();
            newValue = oldValue | bitInt;
        }
        return newValue != oldValue;
    }
}

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