Hi, I built a NIF out of a well known C++ Dicom library called DCMTK. The purpouse of this NIF is to stay loaded for the whole life of my Elixir/Phoenix application, where it’s functions are called many times.
The module that loads this NIF is called from an Agent and I thought it stay there forever, but as it is segfaulting after using it for a while I’m starting to think it is removed from memory after some time…
Let me show my code:
defmodule Prueba3.ImageCache do
use Agent
def start_link(_opts) do
Dcmtknif.initialize()
Agent.start_link(fn -> %{} end, name: :imagecache)
end
def get(key) do
Agent.get(:imagecache, &Map.get(&1, key))
end
def put(key, value) do
Agent.update(:imagecache, &Map.put(&1, key, value))
end
end
defmodule Dcmtknif do
@on_load :load_nifs
def load_nifs do
:erlang.load_nif('./ssr/libssr', 0)
end
def _loadDicomFile(_dicomfile) do
raise "NIF _loadDicomFile/1 not implemented"
end
def _getTagValue(_dcmff, _group, _element) do
raise "NIF getTagValue/1 not implemented"
end
def _getHeader(_dcmff) do
raise "NIF getHeader/1 not implemented"
end
def _getPNG(_dcmff) do
raise "NIF getPNG/1 not implemented"
end
def _setMinMaxWindow(_dcmff) do
raise "NIF setMinMaxWindow/1 not implemented"
end
def _createScaledImage(_dcmff, _width, _height, _interpolate, _aspect) do
raise "NIF createScaledImage/5 not implemented"
end;
def _initialize() do
IO.puts("Dcmtknif.initialize()")
raise "NIF initialize/0 not implemented"
end
def _finalize() do
raise "NIF finalize/0 not implemented"
end
... more functions
end
Do you see something wrong?
