> I am needing a to write a fifo buffer of dynamic size
 > that can handle interrupts at ANY point during execution.
 > This is for an embedded microprocessor application and I
 > can't work out how to make the fifo robust enough to
 > handle the interrupts.

Other than "embedded microprocessor application", you've not
really given enough detail. The interrupt environment varies quite a lot
from one architecture to another.  Then problem you're going to run into is
"dynamic size", however. If you have a fixed memory pool size,
you'll do fine - if you have to involve operating system support, well..
that's another matter entirely.

Have you considered something like "clists", the UNIX paradigm
used to handle character device I/O? Basically, it involves arrays or
blocks of data which are chained together (the exact algorithm doesn't
matter), but the idea is that this form input and output queues. However,
these are still allocated within a fixed (but shared) pool of memory and
are preallocated up-front.

--- MaltEd/2 1.0.b6