[ECOS] Question about Unlock

["Corrin Meyer" <cjmeyer@gmail.com>]

Looking at the unlock_inner method it would seem that it is possible
for calls to unlock_inner to nest.  Since the lock is set (possibly)
to 0 before the unlock_inner function returns it is possible for
another interrupt to occur forcing another call to unlock_inner to
execute on the thread stack again.  If the posted DSRs do not force a
context switch the calls to unlock_inner are nested on the current
running stack.  Given the correct timing it seems possible that nested
unlock_inner methods could result in a stack overflow.

I just wanted to make sure that my understanding is correct: it is
possible for 'continuous' interrupts to result in a Task stack
overflow (which may or may not also result in an interrupt stack
overflow depending on the stack sizes) meaning even if I have an
interrupt stack to run the interrupts and DSRs on the Task stack sizes
still need to accommodate some amount nesting interrupt/DSR overhead.

~ Corrin

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