What is the way to distribute a User Hashmap among distinct socket processing in Rust?

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One way to distribute a User Hashmap among distinct socket processing in Rust is to use shared mutable state through the Arc and Mutex constructs.

First, create an Arc and Mutex around the User Hashmap:

use std::sync::{Arc, Mutex};

let user_map = Arc::new(Mutex::new(HashMap::new()));

Then, in your socket processing threads, each thread can clone the Arc and Mutex to obtain a reference to the User Hashmap:

let shared_user_map = user_map.clone();

With this reference, the thread can then update or read from the User Hashmap as needed:

let mut user_map = shared_user_map.lock().unwrap();
user_map.insert(user_id, user);

Note that the .lock() method of the Mutex returns a locked data guard, which must be unwrapped first before accessing the data. Also note that this approach needs to be used with caution as shared mutable state can lead to data races and other issues.