[erlang-questions] erl_driver: is char *buf from control safe?

[Max Lapshin]

I need to send binary to driver, do some  VERY cpu consumptive job with it
(transcoding video) and return back.


I was trying to use dirty NIFs, but it seems to be very unstable: after
several hours of work whole erlang machine becomes very, very slowly
without any CPU usage.

Now I try to migrate to erl drivers, but I've got new problem: I don't
understand how to get zerocopy from erlang level to C level.

Zerocopy of binaries is a must-have requirement, because copying raw video
can take up to several gigabits per second inside single node.
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