background.go

package main

import (
	"fmt"
	"os"
	"time"
)

func cancel(abort chan bool) {
	fmt.Println("Exit (y/n)")
	for {
		var r int
		fmt.Scanf("%c", &r)
		switch r {
		case 'y':
			abort <- true
		default:
			abort <- false
		}
	}
}

func countDown(count chan int) {
	for i := 10; i >= 0; i-- {
		fmt.Printf("Currently doing step %d\n", i)
		count <- i
		time.Sleep(2000000000)
	}
}

func main() {
	count := make(chan int)
	abort := make(chan bool)
	go countDown(count)
	go cancel(abort)
	for {
		select {
		case i := <-count:
			if i == 0 {
				fmt.Println("konec")
				os.Exit(0)
			}
		case a := <-abort:
			if a {
				os.Exit(0)
			}
		}
	}
}