feat: add threads3.rs exercise

This commit is contained in:
exdx 2022-07-15 13:28:49 +02:00 committed by mokou
parent a3c4c1ccb4
commit a3b5278b42
2 changed files with 78 additions and 0 deletions

View File

@ -0,0 +1,64 @@
// threads3.rs
// Execute `rustlings hint threads3` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
use std::sync::mpsc;
use std::sync::Arc;
use std::thread;
use std::time::Duration;
struct Queue {
length: u32,
first_half: Vec<u32>,
second_half: Vec<u32>,
}
impl Queue {
fn new() -> Self {
Queue {
length: 10,
first_half: vec![1, 2, 3, 4, 5],
second_half: vec![6, 7, 8, 9, 10],
}
}
}
fn send_tx(q: Queue, tx: mpsc::Sender<u32>) -> () {
let qc = Arc::new(q);
let qc1 = qc.clone();
let qc2 = qc.clone();
thread::spawn(move || {
for val in &qc1.first_half {
println!("sending {:?}", val);
tx.send(*val).unwrap();
thread::sleep(Duration::from_secs(1));
}
});
thread::spawn(move || {
for val in &qc2.second_half {
println!("sending {:?}", val);
tx.send(*val).unwrap();
thread::sleep(Duration::from_secs(1));
}
});
}
fn main() {
let (tx, rx) = mpsc::channel();
let queue = Queue::new();
let queue_length = queue.length;
send_tx(queue, tx);
let mut total_received: u32 = 0;
for received in rx {
println!("Got: {}", received);
total_received += 1;
}
println!("total numbers received: {}", total_received);
assert_eq!(total_received, queue_length)
}

View File

@ -918,6 +918,20 @@ If you've learned from the sample solutions, I encourage you to come
back to this exercise and try it again in a few days to reinforce back to this exercise and try it again in a few days to reinforce
what you've learned :)""" what you've learned :)"""
[[exercises]]
name = "threads3"
path = "exercises/threads/threads3.rs"
mode = "compile"
hint = """
An alternate way to handle concurrency between threads is to use
a mpsc (multiple producer, single consumer) channel to communicate.
With both a sending end and a receiving end, it's possible to
send values in one thread and receieve them in another.
Multiple producers are possibile by using clone() to create a duplicate
of the original sending end.
See https://doc.rust-lang.org/book/ch16-02-message-passing.html for more info.
"""
# MACROS # MACROS
[[exercises]] [[exercises]]