minmal.jl

using Base.Threads;

struct SimpleType{T}
    a::Vector{Matrix{T}}
end

Base.length(t::SimpleType) = length(t.a)
Base.getindex(t::SimpleType,i) = t.a[i];


function functional_eigprob(fun,vector)
    #very simplified powermethod
    fun(fun(vector))
end


function dofun(state::SimpleType)
    for i in 1:10
        jobs = map(1:length(state)) do loc

            vec = rand(5);
            acjob = @Threads.spawn functional_eigprob(vec) do x
                @show threadid(),pointer_from_objref(state[1])
                state[loc]*x
            end

            acjob
        end

        fetch.(jobs)

        state = SimpleType([rand(5,5) for i in 1:10]);
        @show pointer_from_objref(state[1])
    end
end

dofun(SimpleType([rand(5,5) for i in 1:10]))