13. It is barely possible, with asynchronous posting behavior and poor semaphore tools, ...
... that Grovelbot could be edged out and put in the 34th position, but it's an embed, so it'd be rare.
The programming logic required to achieve single-threading when interrupts are (as normal) enabled gets quite arcane. It involves such imperfect tools as test-and-set logic and semaphores. Only code at the O/S level with access to hardware interrupt control can realistically enqueue itself predictably. (It's the kind of systems software code I was once a 'guru' in designing. Fun stuff.)
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