timeadd, timediff patch

From: d. hall (dhall@OOI.NET)
Date: 08/11/98

You discussed threading Circle on the list, I also noticed in the recent
version you'd changed the timeadd and timediff function, using static

Instead of using a malloc'ed timeval structure (which would eventually have
to be freed), I figured it would be better to just supply the structure,
and back reference it.  Herein is a patch for comm.c that should fix up the
thread-safe problem, it only required one instance in which a temp variable
was required to store from one timediff to the next.


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