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Questions tagged “Thread Safety”

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How much data can UserDefaults store, and how does it work on disk?

Explain UserDefaults as a small plist-backed prefs store covering size limits, async disk writes, suiteName vs standard, and why main-thread access is allowed but not free

Persistence Performance Thread Safety

Swift

Intermediate Swift

What is the difference between NSCache and Dictionary?

Compare Dictionary and NSCache on one concrete example, an image cache for a photo feed, and show where the two diverge on thread safety, automatic eviction, and key and value rules

Memory Management Thread Safety

Swift

Intermediate Concurrency

What concurrency problems should you know in Swift?

Distinguish race conditions, data races, priority inversion, deadlock, and actor reentrancy anomalies with short Swift examples and practical fixes

Concurrency Thread Safety Actors GCD

Concurrency

Intermediate Concurrency

How do you make shared mutable state thread-safe in Swift?

Start with the race condition, then compare locks, semaphores, queues, barriers, and actors for protecting shared mutable state in real Swift code

Concurrency Thread Safety

Concurrency