Finalize for modules?

I’m working on a package that is using MPI in the background, and are calling MPI.Init() in the modules init function. But I have no idea how I can detect that the module is unloaded (or the Julia session is finished) to call MPI.Finalize() . Exist there any opportunity to get a notification of the teardown process?

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You can add an atexit hook which is called when Julia shuts down.

Note that, for this specific example, MPI.Init() adds this hook by default for you, see MPI.jl/src/environment.jl.