Rewriting the FIFO code

[Ken Brown]

On 12/14/2018 8:43 AM, Ken Brown wrote:
> I'll write
> again when/if I've sorted it out.

Hi Corinna,

Here's a new start.  For now, at least, I'm only trying to accommodate one 
reader and several writers.  Maybe later I'll worry about more than one reader.

The attached patch indicates the approach I have in mind.  There's much more to 
do, and I haven't thought about the duplex case yet.  And there isn't enough 
written for me to test it yet, except to make sure it compiles.  But I just want 
to see if you think the approach is reasonable before I continue.

Ken
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