Server count incrementer in go

ServerInc.go

// Copyright 2016 Kranz. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package main

import (
	"net/http"
	"fmt"
	"runtime"
	"log"
	"os"
	"os/signal"
)

var (
	i int64
	c chan int64
)

func HelloWorld (w http.ResponseWriter, r *http.Request) {
	c <- 1

	fmt.Fprintf(w, "Hello guest number %v\n", i)
}

func init() {
	runtime.GOMAXPROCS(runtime.NumCPU())
	c = make(chan int64)
	go func() {
		for n := range c {
			i += n
		}
	}()

	go func() {
		s := make(chan os.Signal, 1)
		signal.Notify(s, os.Interrupt)

		<-s
		close(c)
		fmt.Printf("Total of visitors are [%v]", i)

	}()
}

func main() {
	http.HandleFunc("/", HelloWorld)

	log.Println("Listen server http://0.0.0.0:9090/")
	log.Fatal(http.ListenAndServe(":9090", nil))
}