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rustlings-exercises-completed/exercises/threads/threads2.rs

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// threads2.rs
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// Execute `rustlings hint threads2` or use the `hint` watch subcommand for a hint.
// 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
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use std::sync::{Arc, Mutex};
use std::thread;
use std::time::Duration;
struct JobStatus {
jobs_completed: u32,
}
fn main() {
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let status = Arc::new(Mutex::new(JobStatus { jobs_completed: 0 }));
let mut handles = vec![];
for _ in 0..10 {
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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
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let mut jorb = status_shared.lock().unwrap();
jorb.jobs_completed += 1;
});
handles.push(handle);
}
for handle in handles {
handle.join().unwrap();
// TODO: Print the value of the JobStatus.jobs_completed. Did you notice anything
// interesting in the output? Do you have to 'join' on all the handles?
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println!("jobs completed {}", status.lock().unwrap().jobs_completed);
}
}