PriorityQueue - Rust #003 - Multithreading

This video is in French.

In this video, we get into the heart of the matter: concurrency.

We start by reorganizing the project as a Cargo workspace to structure the code, then discover how Rust approaches memory safety in a multithreaded context.

Topics covered

• Why switch to a Cargo workspace
• The behavior of thread::spawn, the role of move and 'static
• The Send and Sync traits explained simply
• Why our PriorityQueue is not thread-safe as-is
• Introduction of Arc and Mutex for sharing and protecting data
• RAII, mutex poisoning, and error handling in Result/Option

A key step before tackling async (Tokio, async-std) in the next video.

Useful links

• Cargo Workspaces
• thread::spawn
• Arc
• Mutex
• Shared-State Concurrency

Source code: github.com/xigh/pq-async-rs