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 init() {
  fmt.Println("initializing")
}

...
var once sync.Once
once.Do(init())

Methods

Do()

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