What is the difference between mutex and lock_guard in C++?

What is the difference between mutex and lock_guard in C++?

In C++, a mutex is a synchronization primitive that allows multiple threads to access shared resources safely. A lock_guard, on the other hand, is a convenience wrapper that manages a mutex's locking and unlocking automatically.

Can you explain how to use lock_guard with a mutex?

Sure! You can use lock_guard by including the header <mutex>. To use it, create a lock_guard object and pass the mutex to its constructor. It will lock the mutex upon creation and unlock it when the lock_guard goes out of scope.

Are there any performance differences between using mutex and lock_guard?

Yes, using lock_guard can improve performance by reducing the chances of forgetting to unlock the mutex, which can lead to deadlocks. However, the actual performance difference depends on the specific use case and how often locks are acquired and released.

When should I prefer using lock_guard over a raw mutex?

You should prefer lock_guard when you want to ensure that a mutex is always released, even if an exception occurs. It simplifies code and reduces the risk of errors.