Code RoomRelaxed atomics lose memory ordering

HardPrep Room Coding #1860

Relaxed atomics lose memory ordering

Code reviewCode quality & reviewSenior–Staff~40 min

Review this C++ publish/consume flag pattern.

The atomic is there so it must be fine, right?

What a strong answer looks like

Separate real bugs from style. Rank issues by severity, point at the root cause rather than the symptom, and suggest a concrete fix, specific and kind.

0:00 of about 40 min

Mark a line and say what kind of problem it is.0 findings

1int payload = 0;

2std::atomic<bool> ready{false};

3

4void producer() {

5 payload = compute(); // (1) plain store

6 ready.store(true, std::memory_order_relaxed); // (2)

7}

8

9void consumer() {

10 while (!ready.load(std::memory_order_relaxed)) {} // (3) spin

11 use(payload); // (4)

12}

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