What are the differences between Semaphore and Mutex in C#?

Can you explain the differences between Semaphore and Mutex in C#?

Sure! Both Semaphore and Mutex are synchronization primitives in C#, but they serve different purposes. A Mutex is used to ensure that only one thread can access a resource at a time, while a Semaphore can allow multiple threads to access a resource, up to a specified limit.

When should I use a Semaphore instead of a Mutex?

You should use a Semaphore when you want to limit the number of threads that can access a resource concurrently, rather than restricting access to just one thread. This is useful in scenarios like managing a pool of connections.

Are there any performance differences between them?

Yes, there can be performance differences. Mutexes can be slower due to their kernel-level operations, while Semaphores can be more efficient for managing multiple threads since they operate at a higher level.

Can you give an example of when to use each?

Certainly! Use a Mutex for file access where only one thread should write to a file at a time. Use a Semaphore for managing a limited number of database connections, allowing multiple threads to access the database concurrently.