On Thu, 3 Aug 2017, Pahome Chen via curl-library wrote:

> Maybe the two interface won't affect each other?

If you do two separate transfers in two independent threads, they will be
totally independent (and if they use the same or different libcurl APIs
doesn't matter). They will probably somewhat affect each other though since
they probably use the same network and compete for the same bandwidth, but
only in the same way any other network-using applications will affect them.

-- 
  / daniel.haxx.se
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