Concurrency

Overview

Cross-language concurrency reference organized by concept, not by language. Each concept lists the shared principle plus per-language gotcha callouts for Rust (tokio), Python (asyncio), TypeScript (event loop), and Go. The hard part is never the happy-path API; it's the failure modes — data races, deadlocks, latent OOM from unbounded queues, futures dropped mid-flight by cancellation, and memory-ordering bugs that only surface under load on weakly-ordered CPUs.

Agent Delegation

• loom-senior-software-engineer (Opus) — DEFAULT. Threading models, shared-state vs message-passing, race/TOCTOU analysis, lock ordering, memory ordering, distributed concurrency/consistency, saga patterns.
• loom-software-engineer (Sonnet) — ONLY boilerplate async handlers or unit tests following an established pattern.

Mental Model: Pick the Right Executor