fix(threads1): make program panic if threads are not joined
closes #1298
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@ -1,31 +1,38 @@
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// 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.
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// Execute `rustlings hint threads1` or use the `hint` watch subcommand for a hint.
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// This program should wait until all the spawned threads have finished before exiting.
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// This program spawns multiple threads that each run for at least 250ms,
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// and each thread returns how much time they took to complete.
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// The program should wait until all the spawned threads have finished and
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// should collect their return values into a vector.
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// I AM NOT DONE
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// I AM NOT DONE
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use std::thread;
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use std::thread;
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use std::time::Duration;
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use std::time::{Duration, Instant};
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fn main() {
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fn main() {
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let mut handles = vec![];
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let mut handles = vec![];
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for i in 0..10 {
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for i in 0..10 {
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thread::spawn(move || {
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handles.push(thread::spawn(move || {
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let start = Instant::now();
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thread::sleep(Duration::from_millis(250));
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thread::sleep(Duration::from_millis(250));
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println!("thread {} is complete", i);
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println!("thread {} is complete", i);
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});
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start.elapsed().as_millis()
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}));
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}
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}
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let mut completed_threads = 0;
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let mut results: Vec<u128> = vec![];
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for handle in handles {
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for handle in handles {
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// TODO: a struct is returned from thread::spawn, can you use it?
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// TODO: a struct is returned from thread::spawn, can you use it?
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completed_threads += 1;
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}
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}
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if completed_threads != 10 {
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if results.len() != 10 {
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panic!("Oh no! All the spawned threads did not finish!");
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panic!("Oh no! All the spawned threads did not finish!");
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}
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}
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println!();
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for (i, result) in results.into_iter().enumerate() {
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println!("thread {} took {}ms", i, result);
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}
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}
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}
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@ -969,7 +969,7 @@ A challenge with multi-threaded applications is that the main thread can
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finish before the spawned threads are completed.
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finish before the spawned threads are completed.
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https://doc.rust-lang.org/book/ch16-01-threads.html#waiting-for-all-threads-to-finish-using-join-handles
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https://doc.rust-lang.org/book/ch16-01-threads.html#waiting-for-all-threads-to-finish-using-join-handles
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Collect the JoinHandles and wait for them to finish.
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Use the JoinHandles to wait for each thread to finish and collect their results.
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https://doc.rust-lang.org/std/thread/struct.JoinHandle.html
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https://doc.rust-lang.org/std/thread/struct.JoinHandle.html
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"""
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"""
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