golang-singleton-new-4.go

golang-singleton-new-4.go

var atomicinz uint64

// type global
type singleton map[string]string

var (
	instance singleton
)

func NewClass() singleton {
	for {
		if atomic.LoadUint64(&atomicinz) == 1 {
			return instance
		}
		
		if atomic.CompareAndSwapUint64(&atomicinz, 0, 1) {
			instance = make(singleton)
		}
	}
}