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// This program spawns multiple threads that each runs for at least 250ms, and
// each thread returns how much time it took to complete. The program should
// wait until all the spawned threads have finished and should collect their
// return values into a vector.
use std::{
thread,
time::{Duration, Instant},
};
fn main() {
let mut handles = Vec::new();
for i in 0..10 {
let handle = thread::spawn(move || {
let start = Instant::now();
thread::sleep(Duration::from_millis(250));
println!("Thread {i} done");
start.elapsed().as_millis()
});
handles.push(handle);
}
let mut results = Vec::new();
for handle in handles {
// Collect the results of all threads into the `results` vector.
results.push(handle.join().unwrap());
}
if results.len() != 10 {
panic!("Oh no! Some thread isn't done yet!");
}
println!();
for (i, result) in results.into_iter().enumerate() {
println!("Thread {i} took {result}ms");
}
}
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