Sharing resources in multithreaded closures

It's time to look at parallelism at a lower level, without any crates to help us. We will now check out how to share a resource across threads so that they all can work with the same object. This recipe will also serve as a refresher on manually creating threads, in case it's been a while since you learned about it.

How to do it...

1. In the folder bin, create a file called sharing_in_closures.rs.

2. Add the following code and run it with cargo run --bin sharing_in_closures:

1  use std::thread;
2  use std::sync::Arc;
3  
4  fn main() {
5    // An Arc ("Atomically Reference Counted") is used the exact
6    // same way as an Rc, but also works in a parallel context
7    let some_resource = Arc::new("Hello World".to_string());
8 
9    // We use it to give a new thread ownership of a clone of the 
        Arc
10   let thread_a = {
11     // It is very common to give the clone the same name as the 
          original
12     let some_resource = some_resource.clone...