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🚦 Multithreading & concurrency: iOS interview questions

1. Ways to achieve concurrency in iOS/macOS Middle PRO
2. Run loop Middle PRO
3. Deadlock Middle PRO
4. Livelock Senior PRO
5. DispatchGroup Middle PRO
6. Semaphore Middle PRO
7. Mutex Middle PRO
8. @synchronized Middle PRO
9. A setter in non-ARC code Middle PRO
10. Difference between synchronous and asynchronous tasks Junior PRO
11. Asynchrony vs multithreading — what's the difference? Middle PRO
12. Serial vs concurrent queue — what's the difference? Junior PRO
13. How does DispatchQueue.global() differ from your own concurrent queue? Middle PRO
14. What is a barrier and on which queue does it work? Middle PRO
15. Can you call main.sync from the main thread? What happens? Junior PRO
16. What is DispatchSemaphore and what if you forget signal()? Middle PRO
17. What is a race condition and how do you fix it (3 ways)? Middle PRO