What is the difference between Semaphore and Mutex in Java?

What is the difference between Semaphore and Mutex in Java?

Semaphore and Mutex are both synchronization primitives in Java, but they serve different purposes. A Mutex allows only one thread to access a resource at a time, while a Semaphore can allow multiple threads to access a resource, up to a specified limit.

Can you give me an example of when to use a Semaphore?

Sure! Use a Semaphore when you want to limit the number of threads accessing a resource, like a connection pool, where you might want to allow a maximum of 5 concurrent connections.

What about Mutex? When should I use it?

Use a Mutex when you need to ensure that only one thread can access a critical section of code at a time, such as updating a shared variable.

Are there any performance differences between them?

Yes, Mutexes can be more efficient for single-thread access, while Semaphores can introduce overhead due to managing multiple permits. The choice depends on your specific use case.