rust-concurrency

Rust concurrency model selection depends on workload: use std::thread and rayon for CPU-bound parallelism, and tokio with async for I/O-bound tasks to ensure optimal resource utilization and performance.

Use tokio's spawn_blocking for CPU-bound or blocking operations within an async context to prevent starving the async runtime. Standard spawn is for lightweight, non-blocking asynchronous tasks only.

Share state safely across Rust threads by combining Arc with Mutex or RwLock. Ensure types implement Send and Sync traits correctly to satisfy the compiler's thread safety guarantees during concurrent access.

Avoid Rust deadlocks by carefully managing Mutex lock acquisition order and using channel patterns like mpsc or oneshot for thread communication instead of shared state where possible.

Rayon is designed for CPU-bound data parallelism in Rust, not I/O-bound workloads. For I/O-bound concurrency, use tokio's async runtime with spawn or spawn_blocking to handle blocking operations efficiently.

Rust offers mpsc for single-producer single-consumer streams, oneshot for sending a single value, and broadcast for multi-consumer messaging. Select the channel type matching your thread or async communication pattern.