What Are Semaphores Used for?

Semaphores are integer variables that are used to solve the critical section problem by using two atomic operations, wait and signal that are used for process synchronization.

Where are semaphores used?

Semaphores are typically used in one of two ways: To control access to a shared device between tasks. A printer is a good example. You don't want 2 tasks sending to the printer at once, so you create a binary semaphore to control printer access.

What is a semaphore and why would you use one?

In computer science, a semaphore is a variable or abstract data type used to control access to a common resource by multiple threads and avoid critical section problems in a concurrent system such as a multitasking operating system.