syncroutines.go

package main

import (
	"fmt"
	"sync"
)

var wg sync.WaitGroup

func main() {

	intchan := make(chan int)
	ticker := make(chan bool)
	n := 100

	go oddnums(n, intchan, ticker, &wg)
	go evenums(n, intchan, ticker, &wg)

	go func() {
		for num := range intchan {
			fmt.Println(num)
		}
		wg.Done()
	}()

	wg.Add(3)

	ticker <- true

	wg.Wait()
	close(intchan)

}

func oddnums(n int, intchan chan int, ticker chan bool, wg *sync.WaitGroup) {
	defer wg.Done()

	i := 1

	for i < n {
		<-ticker

		intchan <- i

		ticker <- true

		i += 2
	}
}

func evenums(n int, intchan chan int, ticker chan bool, wg *sync.WaitGroup) {

	defer wg.Done()
	i := 2

	for i < n {
		<-ticker

		intchan <- i

		ticker <- true

		i += 2
	}

}