source: doc/theses/colby_parsons_MMath/benchmarks/channels/go/ping_pong/ping_pong.go

package main

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

var done bool = false;
var total_operations uint64 = 0

var taskJoin chan int = make(chan int, 2)

var ping chan int = make(chan int, 2 )
var pong chan int = make(chan int, 2 )

func Ping() {
        for {
                if done { break }
                pong <- 1
                <-ping
        }
        taskJoin <- 0
}

func Pong() {
        for {
                if done { break }
                <-pong
                ping <- 0
                total_operations++
        }
        taskJoin <- 0
}

func main() {
        runtime.GOMAXPROCS( 2 );

        go Ping()
        go Pong()
                
        // wait 10 seconds
        time.Sleep(time.Second * 10)
        // fmt.Println("prod done\n")
        done = true

        ping <- 2
        pong <- 2

        <-taskJoin
        <-taskJoin

    fmt.Println(total_operations)
}