How to handle thread safety with `Mutex` and `Arc` for a shared state in a Rust multi-threaded application?
I'm relatively new to this, so bear with me. I'm currently developing a multi-threaded application in Rust where I need to share a mutable state across several threads. I've read that using `Arc` (Atomic Reference Counted) and `Mutex` is a common approach for this, but I'm working with a deadlock scenario that I need to seem to resolve. Here's a simplified version of my code where I create a shared state and spawn multiple threads that modify it: ```rust use std::sync::{Arc, Mutex}; use std::thread; struct SharedState { value: i32, } fn main() { let state = Arc::new(Mutex::new(SharedState { value: 0 })); let mut handles = vec![]; for _ in 0..10 { let state_clone = Arc::clone(&state); let handle = thread::spawn(move || { let mut data = state_clone.lock().unwrap(); data.value += 1; // Simulating some work thread::sleep(std::time::Duration::from_millis(50)); data.value -= 1; }); handles.push(handle); } for handle in handles { handle.join().unwrap(); } println!("Final value: {}", state.lock().unwrap().value); } ``` When I run this code, I sometimes get a panic with the message `poisoned lock: the poison flag has been set`. This seems to occur when one of the threads panics while holding the lock. I'm not sure how to handle this situation gracefully or ensure that the state remains consistent. What would be the best practice to avoid this deadlock scenario while using `Mutex` and `Arc`? Should I be checking for the poisoning of the lock, or is there a different pattern I should consider using for thread-safe shared state management in Rust? Any insights would be greatly appreciated! Thanks in advance!