Processing vec in parallel: how to do safely, or without using unstable features?

Question

I have a massive vector that I want to be able to load/act on in parallel, e.g. load first hundred thousand indices in one thread, next in another and so on. As this is goin

Answer 1

One can use an external library for this, e.g. simple_parallel (disclaimer, I wrote it) allows one to write:

extern crate simple_parallel;

let mut data = vec![1u32, 2, 3, 4, 5];

let mut pool = simple_parallel::Pool::new(4);

pool.for_(data.chunks_mut(3), |target| {
    // do stuff with `target`
})

The chunks and chunks_mut methods are the perfect way to split a vector/slice of Ts into equally sized chunks: they respectively return an iterator over elements of type &[T] and &mut [T].