channels_sleep.go

package main

import (
	"fmt"
	"time"
)

func main() {
	fmt.Println("Hello, playground")
	start := time.Now()

	ok := make(chan bool)

	go func() {
		time.Sleep(time.Second * 5)
		ok <- true

	}()

	//time.Sleep(time.Second * 2)
	time.AfterFunc(time.Second*2, func() {
		ok <- false
	})
	if <-ok {
		fmt.Println("ok")
		fmt.Printf("time: %s", time.Since(start))
		return
	}

	fmt.Println("not ok")
	fmt.Printf("time: %s", time.Since(start))
}