README.md

Sync-once (Custom sync.Once)

Implements a simplified version of Go's sync.Once for one-time initialization in concurrent programs.

Problem

Design a synchronization primitive that ensures a function is executed only once, even if called from multiple goroutines.

Requirements

• Only one execution of the function, even with concurrent calls
• Safe for concurrent use
• No external libraries (standard Go only)

Interface

type Once struct {}

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

Example

var once Once

once.Do(func() {
  println("This will only be printed once.")
})

once.Do(func() {
  println("This will not be printed.")
})