There's more...

If you're experienced with parallelism, you might have noticed how suboptimal our algorithm here is. This is intentional, as the elegant and efficient way of writing parallel_sum would require using techniques we have not discussed yet. We will revisit this algorithm in Chapter 7, Parallelism and Rayon, and rewrite it in a professional manner. In that chapter, we will also learn how to concurrently modify resources using locks.