How does compare-and-swap compare to locks?
An example of an AI chatbot conversation about compare-and-swap vs locks in concurrency control.
What is the difference between compare-and-swap and locks?
Compare-and-swap (CAS) is a non-blocking synchronization primitive, while locks are blocking mechanisms.
Can you explain how compare-and-swap works?
Sure! CAS checks if a variable matches an expected value and, if so, updates it to a new value atomically.
What are the advantages of using compare-and-swap over locks?
CAS can reduce contention and improve performance in multi-threaded environments, as it doesn't block threads.
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 update.
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