> Is there any way to detect if the code is running in interrupt, even
> in a archtect dependent way, such as, cpu register?

Without specifying what architecture(s) you care about, it's hard to
say.  On the VAX, "IPL != 0 and on the interrupt stack" is not a bad
approximation, though it can be fooled, and at some points during
context switch, I think it is, it will return true even though it's not
actually in interrupt context.  (Presumably the routine in question
won't be called then, but....)

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