[ECOS] Multiple runnable DSR's

[Ian Gilmour <ian dot gilmour at ffei dot co dot uk>]

My copy of "Embedded Software Development with ECOS" dropped on my desk
yesterday. I've started skimming through it and I've already got a question
that hopefully one of you can answer. 

It isn't clear from the book (or maybe I just haven't hit the relevant bit
of text yet :-)) but from the email archive it appears as though a DSR
associated with a low priority ISR can hold up the execution of a DSR
associated with a high priority ISR.

Is this correct?

Are DSR's assigned priorities (presumably they could be based on ISR
priorities in some way)?

If yes - do higher prioritised DSR's run ahead of lower priority DSR's if
both are runnable?

Or are DSR's simply shoved on a time ordered pending DSR queue and processed
in time order ahead of any user threads?


Thanks in advance.


Ian

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