blob: 7020cb9cea09f7f53e9307afe60f3283e2b090e3 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
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!());
}
|
