How do I run parallel threads of computation on a partitioned array?

Question

I\'m trying to distribute an array across threads and have the threads sum up portions of the array in parallel. I want thread 0 to sum elements 0 1 2 and Thread 1 sum eleme

Answer 1

All your tasks get a copy of the scale variable. Thread 1 and 2 both do the same thing since each has scale with a value of 0 and modifies it in the same manner as the other thread. The same goes for Thread 3 and 4.

Rust prevents you from breaking thread safety. If scale were shared by the threads, you would have race conditions when accessing the variable.

Please read about closures, they explain the variable copying part, and about threading which explains when and how you can share variables between threads.