import java.util.concurrent.ThreadLocalRandom;

public abstract class Mutex {

	static int maxIter = 10;
	static int minIter = 1;
	static int msWait = 350;

	public static void criticalSection(String mark) {
		try {
			int rdIter = ThreadLocalRandom.current().nextInt(minIter, maxIter + 1);
			
			System.out.println("^");
			for (int k = 0; k < rdIter; k++) {
				System.out.println(mark);
				Thread.sleep(msWait);
			}
			System.out.println("v");
		}
		catch (InterruptedException e) {
			// Nothing
		}
	}

	public static void nonCriticalSection() {
		try {
			int rdIter = ThreadLocalRandom.current().nextInt(minIter, maxIter + 1);
			Thread.sleep(rdIter * msWait);
		}
		catch (InterruptedException e) {
			// Nothing
		}
	}

	// Take ownership
	public abstract void p(int id);

	// Release ownership
	public abstract void v(int id);

	public abstract void describe();
}