I'd love to better understand what you're describing. Thread-level compute limits generally seem like they need to be managed in some sort of cooperative fashion, otherwise you end up with the possibility of dangling locks and other kinds of corruption on forcible termination.

What signal are you sending to the running thread? What's the handler look like? How does that translate to terminating the thread? How do you do this forcibly (without cooperation from user code)? Schemes that I have seen look more like generating/ instrumenting polling/checkpoints into user code.