package main

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

func newTicker() {
	t := time.NewTicker(time.Second)
	for v := range t.C {
		fmt.Println("Hello, ", v)
	}
	t.Stop()
}
func timeAfter() {
	for {

		select {
		case <-time.After(time.Second):
			fmt.Println("after ")
		}
	}
}
func Ticker() {
	num := runtime.NumCPU()
	runtime.GOMAXPROCS(num - 1)
	for i := 0; i < 2; i++ {
		go func() {
			for {
				t := time.NewTicker(time.Second)
				select {
				case ti := <-t.C:
					fmt.Println("hello ", ti)
				}
				t.Stop()
			}
		}()
	}
	time.Sleep(time.Second * 20)
}
func usePanic() {
	num := runtime.NumCPU()
	runtime.GOMAXPROCS(num - 1)
	go test()
	for i := 0; i < 2; i++ {
		go calc()
	}
	time.Sleep(time.Second * 2000)
}
func test() {
	defer func() {
		if err := recover(); err != nil {
			fmt.Println("panic:", err)
		}
	}()

	var m map[string]int
	m["stu"] = 100
}
func calc() {
	for {
		fmt.Println("I am working")
		time.Sleep(time.Second)
	}
}
func main() {
	// newTicker()

	// timeAfter()

	// Ticker()

	usePanic()
}