Can a race condition occur when executing such code on Julia?

Question

I have a function below. Can a race condition occur when executing such code?

function thread_test(v)
  Threads.@threads for i = 1:length(v)
      @inbounds v[i] = rand()
  end
  sum(v)
end

Answer 1

If v is an Array there will be no race condition. Accessing different array elements in different threads is safe.

However, if v is eg a Dict{Int, Float64} you can have race conditions. Similarly, you are not guaranteed thread safety for subtypes of AbstractArray , like BitVector .