import java.util.concurrent.Semaphore;

/**
 * An integer that can be incremented atomically.
 * 
 * @author Franck van Breugel
 */
public class AtomicInteger
{	
	private Semaphore semaphore;
	private int value;
	
	/**
	 * Initializes this atomic integer with the given value.
	 * 
	 * @param value the initial value of this atomic integer.
	 */
	public AtomicInteger(int value) 
	{
		super();
		this.semaphore = new Semaphore(1);
		this.value = value;
	}

	/**
	 * Increments atomically.
	 */
	public void increment()
	{
		try 
		{
			this.semaphore.acquire();
			this.value++;
			this.semaphore.release();
		} 
		catch (InterruptedException e) 
		{
			// do nothing
		}
	}
}