Day 21: Coordination Primitives — sync.WaitGroup, sync.Once & sync.Cond
Atomic WaitGroup state, thread-safe lazy init with Once, and Cond signaling without spurious-wakeup traps.
View Day 21 →Day 22: High-Performance Lock-Free Primitives with sync/atomic
CAS, atomic add/load/store, and the cost of bus locking versus cache coherency.
กำลังจะมาDay 23: Context Mastery — Lifecycle, Cancellation Tree & Value Propagation
Timeout enforcement and cancellation graphs without abusing context values in a banking pipeline.
กำลังจะมาDay 24: Concurrency Hazards & Diagnostics (go test -race)
Data races, deadlocks, goroutine leaks, and ThreadSanitizer shadow memory.
กำลังจะมาDay 25: The Worker Pool Pattern (Bounded Concurrency & Backpressure)
Static allocation and throttling for a high-ingestion worker pool.
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