When should I use semaphores in multi-threading?

When should I use semaphores in multi-threading?

Semaphores are useful when you need to control access to a shared resource by multiple threads. They help prevent race conditions.

Can you give me an example of a situation where semaphores would be necessary?

Sure! If you have a limited number of database connections, you can use a semaphore to limit the number of threads accessing the database at the same time.

What’s the difference between a semaphore and a mutex?

A mutex allows only one thread to access a resource at a time, while a semaphore can allow multiple threads, up to a specified limit.

Are there any downsides to using semaphores?

Yes, if not managed properly, semaphores can lead to deadlocks or resource starvation, so it's important to use them carefully.