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Concurrency · medium

24. sync Package

WaitGroup, Mutex and Once.

1 min read2 questionsup to 50 XPtopic 24/50

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sync.WaitGroup waits for a set of goroutines. sync.Mutex and RWMutex protect shared state, always unlocked with defer. sync.Once guarantees one-time initialisation, and atomic operations handle simple counters more cheaply than a mutex.

How to study this topic

  1. 1. Read the explanation once end to end, skipping the code.
  2. 2. Re-read the code snippets and say out loud what each line does.
  3. 3. Answer the quiz without scrolling back — that is the real check.
  4. 4. Read every explanation, even for the answers you got right.

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Check your understanding

  1. 1. Which type waits for goroutines to finish?

  2. 2. Mutex unlocking is usually paired with…

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