Unexpected Behavior with Rust Core's `Mutex` in an Async Context
Does anyone know how to I'm working on a project and hit a roadblock... This might be a silly question, but I need help solving Can someone help me understand I'm stuck on something that should probably be simple. I'm experiencing unexpected behavior when using Rust's core `Mutex` within an asynchronous context. I'm working with version 1.63.0 of Rust and using the `tokio` runtime. I expected my `Mutex` to allow safe, concurrent access to a shared resource, but I'm encountering a deadlock situation in my async tasks. Here's a simplified version of my code: ```rust use std::sync::Mutex; use tokio::task; struct SharedData { value: i32, } fn main() { let data = Mutex::new(SharedData { value: 0 }); let handles: Vec<_> = (0..10) .map(|_| { let data = data.clone(); task::spawn(async move { let mut lock = data.lock().unwrap(); lock.value += 1; // Simulate async I/O tokio::time::sleep(tokio::time::Duration::from_millis(10)).await; }) }) .collect(); futures::future::join_all(handles).await; println!("Final value: {}", data.lock().unwrap().value); } ``` I expected to increment the `value` field concurrently without issues, but instead, I often see a panic with the message: `thread 'tokio-runtime-worker' panicked at 'poisoned lock: the Mutex is currently poisoned'`. I checked that my locks are being released, yet I still encounter deadlocks. After some investigation, I found that if the lock is poisoned (which occurs when a panic happens while a lock is held), it affects future attempts to lock it. I tried wrapping the lock in a `Result` block to handle potential poisoning, but it feels cumbersome and I still run into issues where my tasks hang indefinitely. I've read through the [Rust documentation on Mutex](https://doc.rust-lang.org/std/sync/struct.Mutex.html) and the [Tokio documentation](https://tokio.rs/tokio/tutorial) to ensure I'm following best practices, but it's still not clear how to effectively manage shared state in an async context. Is there a better way to handle shared mutable state in asynchronous Rust without running into these lock poisoning issues or deadlocks? Any insights or examples would be greatly appreciated! This is part of a larger application I'm building. Is there a better approach? The project is a web app built with Rust. Thanks, I really appreciate it! I've been using Rust for about a year now. I'm working with Rust in a Docker container on macOS. I'm working on a CLI tool that needs to handle this. Any ideas how to fix this?