Can someone recommend a good, modern tutorial on concurrency?

[vns]

@dima_kozhinov

This sounds like complete gibberish to me.

So Thread.sleep being marked as unavailable from async is gibberish?

@dima_kozhinov

Second, blocking inside async function cannot be a programming error.

I wouldn't be so sure:
https://forums.swift.org/t/cooperative-pool-deadlock-when-calling-into-an-opaque-subsystem/

@dima_kozhinov

First, I said that await blocks caller thread, and not a called async function, which runs in a separate worker thread.

await does not block any thread at all. It suspends function^[1]. Then work is scheduled to be run on a thread.

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1. to be completely correct, it marks a potential suspension point, but does not determines if it will actually suspend. ↩︎