Practice Calibration

Use this after attempting independent practice. These are calibration notes for the new cases, not answers to every original open-ended project. The module assessment retains its own scoring and evidence requirements.

Prerequisite calibration

Sequential result 2. Both reads may see 0 and both writes store 1 without synchronization. This is a prerequisite state trace, not a demand to know mutex APIs yet.

A ready answer includes the example or trace requested in the entry check. A memorized term is not sufficient. Repair the named earlier skill, then change the example and explain it without this page.

Case A

Wake blocked waiters; producers stop accepting new items; consumers may drain accepted items and then terminate. Recheck predicates after wakeup, not just the notification event.

Full practice credit requires the result, assumptions and an explanation of the tempting error. A correctly guessed conclusion without those elements is only partial evidence.

Case B

All affected waiters need a chance to observe closure. Predicate/notification design must account for every waiter; waking one does not close the others' wait.

The key judgment is which guarantee survives the changed condition. Do not transfer a result from the first case without checking that condition.

Experiment calibration

Run the queue kit and native parallel histogram clinic. Retain actual scheduling/failure controls and equality with the sequential result. Do not infer race freedom from a single successful run or timeout.

A usable record links the hypothesis to the actual input, observation and interpretation. The negative control must fail for the intended reason, and the repaired setup must pass the relevant check again. Report unexpected outcomes rather than altering the hypothesis afterward. Explicitly state the model, environment and untested boundary; passing a small fixture never proves every deployment behavior.

Recheck

Explain a fresh variant without the key. Retain the original error, repair, help received and delayed result in the existing evidence packet. Self-calibration is not an independent reviewer sign-off or a learner-pilot result. For retrieval-question explanations, use quiz calibration only after attempting the quiz.