mirror of
https://github.com/rust-lang/rustlings.git
synced 2024-05-27 06:06:11 +02:00
43 lines
1.1 KiB
Rust
43 lines
1.1 KiB
Rust
// threads2.rs
|
|
//
|
|
// 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_completed
|
|
//
|
|
// Execute `rustlings hint threads2` or use the `hint` watch subcommand for a
|
|
// hint.
|
|
|
|
// I AM NOT DONE
|
|
|
|
use std::sync::Arc;
|
|
use std::thread;
|
|
use std::time::Duration;
|
|
|
|
struct JobStatus {
|
|
jobs_completed: u32,
|
|
}
|
|
|
|
fn main() {
|
|
// TODO: `Arc` isn't enough if you want a **mutable** shared state
|
|
let status = Arc::new(JobStatus { jobs_completed: 0 });
|
|
|
|
let mut handles = vec![];
|
|
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_completed += 1;
|
|
});
|
|
handles.push(handle);
|
|
}
|
|
|
|
// Waiting for all jobs to complete
|
|
for handle in handles {
|
|
handle.join().unwrap();
|
|
}
|
|
|
|
// TODO: Print the value of `JobStatus.jobs_completed`
|
|
println!("Jobs completed: {}", ???);
|
|
}
|