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📜 WAYPOINT LESSON

Checkpoint: Concurrency

⭐⭐ intermediate⏳ 15 min read📍 Lesson 97 of 180

Graded checkpoint: thread-local counting with a post-join merge — exact totals, no shared mutable maps.

Checkpoint — concurrency

You can now: use joins as happens-before edges, fix races with atomics, and synchronize completion with latches. Prove it with a parallel word counter that must return exact totals.