Is it possible to get the current number of active FFTW threads?

For profiling purposes I'm interested in developing a julia tool that asynchronously monitors threading load and measure quality of threading balance.

That's simple now in julia 1.8 because profiling can identify which julia tasks/threads are awake.

Is there a way to do that asynchronously with FFTW? Crudely, just a count of active FFTW threads at a given time?

___

Answering my question partly, as on inspection I'm realizing that FFTW threads are managed by julia via `@spawn`
https://github.com/JuliaMath/FFTW.jl/blob/17bc81a0fcf9875d777ea4bee2fca70fc23c8a0c/src/providers.jl#L58