What are the differences between std::mutex and std::shared_mutex?

What are the differences between std::mutex and std::shared_mutex?

std::mutex is a mutual exclusion lock that allows only one thread to access a resource at a time. std::shared_mutex, on the other hand, allows multiple threads to read a resource simultaneously while still providing exclusive access for writing.

When should I use std::shared_mutex instead of std::mutex?

You should use std::shared_mutex when you have a scenario where reads are more frequent than writes. It allows multiple threads to read concurrently, improving performance in read-heavy situations.

Can you give an example of when to use each?

Sure! Use std::mutex for a simple counter where only one thread updates it. Use std::shared_mutex for a cache where many threads read data, but only one thread updates it occasionally.

Are there any performance considerations I should be aware of?

Yes, std::shared_mutex can introduce overhead due to managing shared access. If writes are frequent, std::mutex might be more efficient. Always profile your application to make the best choice.