Multi-reader single-writer queue
You want a property that several threads can read at the same time while writes happen one at a time. Back in the Objective-C days there was a pattern of dispatch_sync in the getter and dispatch_barrier_async in the setter, and the interviewer asks: "If the getter is sync, that's synchronous, so how can several reads happen at once?" How would you explain that?
ConcurrencyMultiple choiceBasics
In this cache built on a GCD concurrent queue, which statement about the role of the .bar…
#gcd #barrier #reader-writer
ConcurrencyShort answerIntro
What is GCD (Grand Central Dispatch), and why do you hand work to a queue instead of crea…
#gcd
ConcurrencyShort answerBasics
You're building an image pipeline: download, resize, then save to the disk cache, and whe…
#gcd
ConcurrencyShort answerBasics
This code gets called from several threads, and count comes out lower than expected. Can …
#actor