Writing Apps in Go and Swift

Re:Writing Apps in Go and Swift by saagarjha on Tuesday January 29, 2019 @07:33PM (#19031422)

> Cocoa is incredibly fragile about the main thread, so you need to be super careful what runs in what queue.

This basically just boils down to "don't touch the UI off the main thread". There are some exceptions with CoreAnimation, but other than that the main thread checker will yell at you if you do something wrong.

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Re:Writing Apps in Go and Swift by favorited on Tuesday January 29, 2019 @10:41PM (#19032445)

The main thread checker is a godsend. Enabling it + TSAN + Core Data concurrency assertions have reduced the threading bugs my team deals with to almost 0.

Anywhere we're doing something specific, we make liberal use of `dispatchPrecondition(condition: .onQueue(mySerialQueue))` or `assert(Thread.isMainThread)`.

Even in places where we are doing multithreaded UI rendering (mostly CATiledLayer), it's become a non-issue. It's a night-and-day difference compared to 5+ years ago.

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