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Go · Class

sync.Once

sync.Once runs one function exactly once for a given Once value. Other callers wait for that function to finish, and later calls do nothing.

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Syntax

func (o *Once) Do(f func())

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  • sync.Mutex
  • sync/atomic.Bool
  • Go memory model

Source: once.go - The Go Programming Language. Checked 2026-11-03.