kubamracek added a comment.
> I recently started writing these early-exit returns as return {};
Good suggestion!
> A testcase that triggers this situation would be nice, too.
I think this is too tricky. If I understand correctly, an example of an
unsafe-to-call thread state is when we're parked inside a `__select` system
call, and if we do invoke other code on that thread, sometimes, some kernel
data structures can get out of sync from the thread state and the `__select`
system call can sometimes return wrong results. Sounds quite hard to write a
reliable test case for this, since the exact behavior also depends on OS
version. I hope you'll forgive me for not providing this test :)
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https://reviews.llvm.org/D56115/new/
https://reviews.llvm.org/D56115
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