no description

main.go

package main

import (
	"fmt"
	"time"
)

func main() {
	//make a program standby
	times := make(chan time.Time)
	go doJob(times)
	for {
		//receive time from timer
		t := <-times
		fmt.Println("the time is", t)
	}

}

var count int
var second int
var minute int

// make job with every thirty seconds
func doJob(times chan time.Time) {
	go seconds()
	for {
		times <- time.Now()
		//send how many times timer has been called
		count++
		fmt.Println("timer has been called", count, "times")
		fmt.Println("executing job...")
		time.Sleep(30 * time.Second)
	}
}

// count every single second
func seconds() {
	for {
		second++
		fmt.Printf("s: %d\n", second)
		//reset every 60 seconds
		if second == 60 {
			second = 0
			go minutes()
		}
		time.Sleep(1 * time.Second)
	}
}

// count minutes
func minutes() {
	minute++
	fmt.Printf("m: %d\n", minute)
	//reset every 60 minutes
	if minute == 60 {
		minute = 0
	}
	time.Sleep(1 * time.Minute)
}