runner.go

package main

import (
	"fmt"
	"time"
)

//http://www.goinggo.net/2014/02/the-nature-of-channels-in-go.html

func main() {
	// Create an unbuffered channel
	baton := make(chan int)

	// First runner to his mark
	go Runner(baton)

	// Start the race
	baton <- 1

	// Give the runners time to race
	time.Sleep(500 * time.Millisecond)
}

func Runner(baton chan int) {
	var newRunner int

	// Wait to receive the baton
	runner := <-baton

	// Start running around the track
	fmt.Printf("Runner %d Running With Baton\n", runner)

	// New runner to the line
	if runner != 4 {
		newRunner = runner + 1
		fmt.Printf("Runner %d To The Line\n", newRunner)

		//call itself
		go Runner(baton)
	}

	// Running around the track
	time.Sleep(100 * time.Millisecond)

	// Is the race over
	if runner == 4 {
		fmt.Printf("Runner %d Finished, Race Over\n", runner)
		return
	}

	// Exchange the baton for the next runner
}