[ECOS] Thread state during interruption

[Jonathan Larmour]

Michele Portolan wrote:
> I'm programming an interrupt handler,but there's a thing I cannot
> understand:
> if I do not change the interrupted thread state inside the ISR do I risk for
> it to be scheduled before the DSR has terminated?

Yes an ISR can run again before the DSR is terminated unless you mask that 
interrupt. Allowing interrupts to remain enabled is one of the points of 
the ISR being separate from a DSR. An ISR can run before the DSR is even 
started!

> But there are not states like "blocked on interrution".

ISRs are run "outside" the kernel - kernel interaction is for DSRs 
(althoug that doesn't by itself change thread state either, 
intentionally). The thread state is not altered just because an ISR is 
running.

Jifl
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