package main

import (
	"log"
	"time"
)

func main() {
	tick := time.Tick(100 * time.Millisecond)

	boom := time.After(5000 * time.Millisecond)

	for {
		select {
		case <-tick:
			log.Println("tick.")
		case <-boom:
			log.Println("boom")
			return
		default:
			log.Println("    .")
			time.Sleep(50 * time.Millisecond)
		}
	}
}