Code RoomLock-free concurrent queue
HardPrep Room Coding #4040

Lock-free concurrent queue

Vibe & agenticConcurrencyCode quality & reviewSenior–Staff~18 min

You need to write a lock-free concurrent queue in Rust using atomics for a high-throughput message broker. A teammate says modern AI agents are great at Rust and suggests generating the whole structure, memory ordering and all. Make the judgment call: is this a good delegation? What failure modes specifically attach to AI-generated concurrent/unsafe code, and how does that change how you'd use the tool?

Implement
audit_atomic_trace(trace_rows: list[str]) → list[str]
Examples
in[["t1|publish|head|release","t2|consume|head|acquire"]]out[]
in[["t1|publish|head|relaxed","t2|consume|head|relaxed"]]out["0:publish_not_release","1:consume_not_acquire"]
in[["t1|publish|head|relaxed","t2|consume|head|acquire"]]out["0:publish_not_release","1:unsynchronized_read"]
What a strong answer looks like

Treat the AI’s output as a draft to verify, not an answer to trust. Name the specific flaw and the input that triggers it, say how you’d catch it (tests, edge cases, reading critically), and how you’d re-prompt or decompose to get it right.

0:00 of about 18 min

Vibe & agentic: describe the solution in plain language (or narrate it) and the coach grades your approach.

Which questions mattered is sealed until you submit. Telling you now would just be handing over the edge cases.