When should I use semaphores or mutexes in C++?

When should I use semaphores or mutexes in C++?

In C++, semaphores are used for signaling between threads, while mutexes are used to protect shared resources. Do you have a specific scenario in mind?

I have multiple threads accessing a shared variable. Should I use a mutex?

Yes, a mutex is ideal for protecting shared variables from concurrent access, ensuring that only one thread can modify the variable at a time.

What about semaphores? When would I need those?

Semaphores are useful when you need to control access to a resource that can be used by multiple threads simultaneously, like a pool of connections.

Can you give me an example of using a semaphore?

Sure! If you have a thread pool with a limited number of threads, you can use a semaphore to limit the number of threads that can access a resource at the same time.