rustlings/exercises/threads/threads1.rs

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// threads1.rs
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// Execute `rustlings hint threads1` or use the `hint` watch subcommand for a hint.
// This program spawns multiple threads that each run for at least 250ms,
// and each thread returns how much time they took to complete.
// The program should wait until all the spawned threads have finished and
// should collect their return values into a vector.
// I AM NOT DONE
use std::thread;
use std::time::{Duration, Instant};
fn main() {
let mut handles = vec![];
for i in 0..10 {
handles.push(thread::spawn(move || {
let start = Instant::now();
thread::sleep(Duration::from_millis(250));
println!("thread {} is complete", i);
start.elapsed().as_millis()
}));
}
let mut results: Vec<u128> = vec![];
for handle in handles {
// TODO: a struct is returned from thread::spawn, can you use it?
}
if results.len() != 10 {
panic!("Oh no! All the spawned threads did not finish!");
}
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println!();
for (i, result) in results.into_iter().enumerate() {
println!("thread {} took {}ms", i, result);
}
}