Case 1: No Cycles. Taken from Bell, John T. "Deadlocks." University of Illinois, Chicago.
Case 2: A Cycle and a Deadlock. Miriam Briskman, CC BY-NC 4.0.
Case 3: A Cycle and a Deadlock. Taken from Bell, John T. "Deadlocks." University of Illinois, Chicago.
Case 3: A Cycle but No Deadlock. Taken from Bell, John T. "Deadlocks." University of Illinois, Chicago.