From 4dfc11d74ab02ac5765ae5d08fb750c91f4744b4 Mon Sep 17 00:00:00 2001 From: Hunter Kvalevog Date: Fri, 2 Oct 2026 21:53:51 -0500 Subject: rustlings: move to rust/ --- rust/rustlings/exercises/20_threads/threads2.rs | 34 +++++++++++++++++++++++++ 1 file changed, 34 insertions(+) create mode 100644 rust/rustlings/exercises/20_threads/threads2.rs (limited to 'rust/rustlings/exercises/20_threads/threads2.rs') diff --git a/rust/rustlings/exercises/20_threads/threads2.rs b/rust/rustlings/exercises/20_threads/threads2.rs new file mode 100644 index 0000000..7020cb9 --- /dev/null +++ b/rust/rustlings/exercises/20_threads/threads2.rs @@ -0,0 +1,34 @@ +// Building on the last exercise, we want all of the threads to complete their +// work. But this time, the spawned threads need to be in charge of updating a +// shared value: `JobStatus.jobs_done` + +use std::{sync::Arc, thread, time::Duration}; + +struct JobStatus { + jobs_done: u32, +} + +fn main() { + // TODO: `Arc` isn't enough if you want a **mutable** shared state. + let status = Arc::new(JobStatus { jobs_done: 0 }); + + let mut handles = Vec::new(); + for _ in 0..10 { + let status_shared = Arc::clone(&status); + let handle = thread::spawn(move || { + thread::sleep(Duration::from_millis(250)); + + // TODO: You must take an action before you update a shared value. + status_shared.jobs_done += 1; + }); + handles.push(handle); + } + + // Waiting for all jobs to complete. + for handle in handles { + handle.join().unwrap(); + } + + // TODO: Print the value of `JobStatus.jobs_done`. + println!("Jobs done: {}", todo!()); +} -- cgit v1.2.3