What is the performance impact of using shared_mutex in C++?

What is the performance impact of using shared_mutex in C++?

The performance of shared_mutex in C++ can vary based on the use case. It allows multiple readers or one writer, which can improve concurrency.

How does it compare to std::mutex?

Unlike std::mutex, which allows only one thread to access a resource at a time, shared_mutex allows multiple threads to read simultaneously, improving read-heavy workloads.

Are there any downsides to using shared_mutex?

Yes, the overhead of managing multiple readers can lead to contention issues in write-heavy scenarios, potentially degrading performance.

When should I use shared_mutex instead of a regular mutex?

Use shared_mutex when you have a high number of read operations compared to write operations, as it can significantly enhance performance in such cases.

Can you provide an example of its usage?

Sure! Here's a simple example: you can use shared_mutex to protect a shared resource where multiple threads read data while only one thread writes.