Cacher is the code snippet organizer for pro developers

package main

import (
	"fmt"
	"sync"
)

func main() {
	wg := sync.WaitGroup{}
	wg.Add(3)
	sem := make(chan int, 1)

	for i := 0; i < 3; i++ {
		go func(id int) {
			defer wg.Done()
			sem <- 1
			for x := 0; x < 3; x++ {
				fmt.Println(id, x)
			}
			<-sem
		}(i)
	}

	wg.Wait()
}