import java.util.concurrent.Semaphore;

public class Writer extends Thread 
{
	public static final Semaphore writer = new Semaphore(1);

	public void run() 
	{
		try 
		{
			Writer.writer.acquire();
			// write
			Writer.writer.release();
		} 
		catch (InterruptedException e) 
		{
			e.printStackTrace();
		}
	}
}