Unrelated to coroutines, but I was looking at the ...

# coroutines

[Edoardo Luppi]

Unrelated to coroutines, but I was looking at the code for limitedParallelism, and found that the int value is checked with

// Save a few bytecode ops
internal fun Int.checkParallelism() = require(this >= 1) { "Expected positive parallelism level, but got $this" }

Was this done because of bytecode size limitations of the Android platform? Or because of something else?

[bezrukov]

I would guess it is virtual call vs setting up a thread for a possible exception. So basically it forces require(...) to not be inlined

[jw]

Yes, but it becomes a static call in the bytecode. There's also no threads involved for exceptions.

It moves the conditional, exception instantiation, and string builder code to a single location. The call sites only have the single invoke static.