What are the performance implications of using std::shared_lock?

What are the performance implications of using std::shared_lock?

Using std::shared_lock allows multiple threads to read shared data concurrently, improving read performance. However, it can introduce overhead due to the need for managing shared ownership and potential contention when threads try to acquire the lock.

How does it compare to std::unique_lock?

std::unique_lock provides exclusive ownership, allowing only one thread to access the resource at a time, which can be more efficient for write operations. In contrast, std::shared_lock is better for scenarios with many readers and few writers.

Are there any scenarios where std::shared_lock should be avoided?

Yes, std::shared_lock should be avoided in scenarios with high contention for write access, as it can lead to performance bottlenecks due to the overhead of managing shared locks.

What are some best practices for using std::shared_lock?

Best practices include minimizing the duration of the lock, avoiding nested locks, and using it in read-heavy scenarios to maximize concurrency.