Compare and Swap vs Locks: Which is Better?

What are the main differences between compare-and-swap and locks?

Compare-and-swap (CAS) is an atomic operation that updates a value only if it matches an expected value, while locks are mechanisms that prevent multiple threads from accessing a resource simultaneously.

When should I use compare-and-swap instead of locks?

Use compare-and-swap when you need high concurrency and low overhead, as it allows multiple threads to operate without blocking.

Are there any downsides to using compare-and-swap?

Yes, CAS can lead to issues like the ABA problem, where a value changes between the check and the update, potentially causing incorrect behavior.

In what scenarios are locks more beneficial?

Locks are beneficial in scenarios where you need to ensure exclusive access to a resource, especially when complex operations are involved.