Deadlock.java

import java.util.concurrent.Semaphore;

public class Deadlock {

    public Deadlock( ) {
        Semaphore mutex[] = new Semaphore[4];

        for ( int i = 0; i < 4; i++ )
            mutex[i] = new Semaphore(1);

        A threadA = new A( mutex );
        B threadB = new B( mutex );
        C threadC = new C( mutex );

        threadA.start( );
        threadB.start( );
        threadC.start( );
    }
    ...
}