sync Primitives: Workload-Specific Tradeoffs
Choose synchronization primitives from measured workload behavior and documented contracts.
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What this chapter teaches
RWMutex is faster for reads, sync.Map is the concurrent map, and sync.Pool manages a pool of reusable memory you can rely on.
lock and map costs depend on the read/write mix, key overlap, critical-section work, core count, and Go implementation. The supplied benchmark favors RWMutex and sync.Map; another workload may favor a plain locked map. sync.Pool is a cache whose contents may disappear, so correctness must never depend on a pooled object being present. sync.Once has a short warm path, but its cost still belongs in a measurement when it matters.
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