TransactionKit, from the developer of RegexKit, provides a thread-safe, lock-free replacement for NSDictionary/NSMutableDictionary. The design uses multi-version concurrency control—transaction numbers, essentially—to allow concurrent read and write access with better multi-threaded performance than using locks. Unlike NSDictionary, TransactionKit uses chaining, so it likely uses more memory and is not as cache-friendly. Chaining works nicely with atomic … Continue reading TransactionKit