rustlings/exercises/19_smart_pointers/arc1.rs

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// In this exercise, we are given a `Vec` of u32 called `numbers` with values
// ranging from 0 to 99. We would like to use this set of numbers within 8
// different threads simultaneously. Each thread is going to get the sum of
// every eighth value with an offset.
//
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// The first thread (offset 0), will sum 0, 8, 16, …
// The second thread (offset 1), will sum 1, 9, 17, …
// The third thread (offset 2), will sum 2, 10, 18, …
// …
// The eighth thread (offset 7), will sum 7, 15, 23, …
//
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// Because we are using threads, our values need to be thread-safe. Therefore,
// we are using `Arc`.
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// Don't change the lines below.
#![forbid(unused_imports)]
use std::{sync::Arc, thread};
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fn main() {
let numbers: Vec<_> = (0..100u32).collect();
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// TODO: Define `shared_numbers` by using `Arc`.
// let shared_numbers = ???;
let mut join_handles = Vec::new();
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for offset in 0..8 {
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// TODO: Define `child_numbers` using `shared_numbers`.
// let child_numbers = ???;
let handle = thread::spawn(move || {
let sum: u32 = child_numbers.iter().filter(|&&n| n % 8 == offset).sum();
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println!("Sum of offset {offset} is {sum}");
});
join_handles.push(handle);
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}
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for handle in join_handles.into_iter() {
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handle.join().unwrap();
}
}