tick.go

package main

import (
	"fmt"
	"time"
)

var end = make(chan struct{})

func tick(n int) {
	ticker := time.NewTicker(3 * time.Second)

	go func(n int) {
		for {
			select {
			case <-ticker.C:
				fmt.Printf("dupa%d\n", n)
			case <-end:
				ticker.Stop()
				return
			}
		}
	}(n)
}

func main() {
	for i := 0; i < 10; i++ {
		fmt.Printf("go tick(%d)\n", i)
		go tick(i)
	}

	time.Sleep(30 * time.Second)
	fmt.Println("closing...")
	close(end)
}