Quit by closing channel

quit-by-closing-channel.go

package main

import "sync"
import "fmt"
import "time"

func main() {
    quit := make(chan interface{}, 10)
    wg := sync.WaitGroup{}
    wg.Add(1)

    go func() {
        for {
            select {
            case <-quit:
                fmt.Println("exited")
                wg.Done();
                return
            default:
                time.Sleep(time.Second / 2)
                fmt.Println("waiting")
            }
        }
    }()

    time.Sleep(time.Second * 20)

    close(quit)

    wg.Wait()
}