Nerixyz wrote:

> The launch sequence is in parallel. Is it possible that the two debug adapter 
> implements are handling them in different orders? It took me a while to 
> realize this. I found this diagram enlightening: [microsoft/vscode#4902 
> (comment)](https://github.com/microsoft/vscode/issues/4902#issuecomment-368583522)

Ah, thank you! This cleared things up for me. I was a bit confused why I saw a 
third thread when debugging, but it turns out that the launch sequence is fine 
and it's Windows creating a thread pool in the background when calling 
WaitForSingleObject ([according to this SO 
answer](https://stackoverflow.com/a/63098682/16300717)), which is called in 
`thread.join()`.

I converted the tests to C++ now, as C's `<threads.h>` isn't supported 
everywhere. Furthermore, I only ignore the order of threads on Windows.

https://github.com/llvm/llvm-project/pull/141529
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