Go Once

Internal

• The sync Package
• Goroutines | Synchronization

Overview

Once is a Go synchronization construct that is used when a piece of code must be executed only once. This is a useful idiom in initialization.

func initialization() {
  fmt.Println("initializing ...")
}

...

go func() {
  ...
  once.Do(initialization)
  ...
}()

Methods

Do()

The only argument of Do() is a function value.

All invokers will block, except one, and they will be released after the one that does initialization finishes executing. The others will no execute.