go routines singleton / published by https://github.com/dacr/code-examples-manager #bf57f6e8-ddad-427b-99bd-e5027c56e9db/a88dba1529163054bf2e0c4890f2de7a207e1246

concurrency-singleton.go

/*?sr/bin/true; exec /usr/bin/env nix-shell -p go --run "go run $0" #*/
// summary : go routines singleton
// keywords : go, goroutines, singleton, @testable
// publish : gist
// authors : David Crosson
// license : Apache NON-AI License Version 2.0 (https://raw.githubusercontent.com/non-ai-licenses/non-ai-licenses/main/NON-AI-APACHE2)
// id : bf57f6e8-ddad-427b-99bd-e5027c56e9db
// created-on : 2025-03-27T14:28:34+01:00
// managed-by : https://github.com/dacr/code-examples-manager
// run-with : nix-shell -p go --run "go run $file"
package main

import "sync"

var initialized int
var mySingleton sync.Once

func main() {
	mySingleton.Do(func() {
		initialized = 1
	})
	println(initialized)
}