Simulate the traffic at the intersection of two one-way streets using semaphores. The traffic must obey the following rules: • Only one car can be crossing at any given time.
• When a car reaches the intersection and no other cars are approaching from the other direction, then the car must be allowed to proceed immediately.
• Cars arriving from both directions simultaneously must take turns in crossing.
The solution should obey the following principles:
• A car approaching from one direction is modeled by incrementing a corresponding counter (Ex: ns for north-south, ew for east-west).
• A busy flag indicates whether the intersection is free or whether a car is currently crossing.
• When busy is true, a car blocks on a semaphore corresponding to the car's direction.
• A blocked car is unblocked when the currently crossing car leaves the intersection.