How busy waiting can be avoided when using the semaphores as a synchronization tool?

Busy waiting can be avoided with semaphores by using blocking calls instead of active polling. When a thread attempts to acquire a semaphore and it is unavailable, the thread can be put to sleep, allowing other threads to execute. This approach minimizes CPU usage and improves overall system efficiency. Additionally, using condition variables in conjunction with semaphores can further enhance synchronization by allowing threads to wait for specific conditions without busy waiting.