go-timer-with-done.go

package main

import (
	"fmt"
	"runtime"
	"time"
)

func main() {
	ticker := time.NewTicker(200 * time.Millisecond)
	done := make(chan bool)
	go func() {
		for {
			select {
			case <-done:
				return
			case t := <-ticker.C:
				fmt.Println("Tick at", t)
			}
		}
		// runtime.Goexit()
	}()
	time.AfterFunc(time.Second, func() {
		fmt.Println("run ticker.Stop() at " + time.Now().String())
		ticker.Stop()
		done <- true
	})
	time.Sleep(2 * time.Second)
	fmt.Println(runtime.NumGoroutine())
}