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Advanced. Deep dive for people who know the field.
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Systems programmingProgramming languagesRustConcurrency and parallelismMemory management
Jon Gjengset explains Rust's atomic types and memory ordering, demonstrating how to implement concurrency primitives like mutexes.
In this episode of Crust of Rust, we go over Rust's atomic types, including the mysterious Ordering enum. In particular, we explore the std::sync::atomic module, and look at how its components can be used to implement concurrency primitives like mutexes. We also investigate some of the gotchas and sometimes counter-intuitive behaviors of the atomic primitives with different memory orderings, as well as strategies for testing for and debugging errors in concurrent code. Introduction What are atomics? The Memory Model AtomicUsize Questions so far Implementing a (bad) Mutex Our Mutex works! Pesky thread interleavings compare_exchange Mitigating compare_exchange contention compare_exchange_weak Ordering::Relaxed Ordering::Acquire/Release The fetch_ methods Ordering::SeqCst Breather ThreadSanitizer loom Atomic fences volatile AtomicPtr Atomics through FFI Consume ordering? Closing thoughts You can read more about Rust's memory model in the Rust reference at doc.rust-lang.org/nightly/reference/memory-model.html and in the C++ memory model documentation at en.cppreference.com/w/cpp/atomic/memory_order. Live version with chat: youtube.com/watch?v=0Vq2aJxwB1oWhat people say. Recommended as an in-depth explanation of Rust atomics and memory ordering.
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