Hello David,
 In a message dated 26 Nov 96 you wrote to me :

 >> 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.

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

Ok here's some more information:
I am writing some software which takes messages in from external events,
driven by interrupt.  With the uProcessor it halts everything when an
interrupt happens, then returns to the instruction after the one it was
executing prior to interrupt.  An interrupt places information in the fifo
(or queue, or pipe...) and a slow-speed function pulls it out when it is
required.  The problem I am having is:  What happens if I get interrupted
in a place where I am adjusting the size of the fifo?  I am unable to
disable interrupts at this time as I cannot afford to miss a single
interrupt.

btw the uProcessor has a virtually non-existance OS so no probs there.

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