inanzzz | A ping pong example with Golang sync mutex

In this example we are going to create a "ping/pong" game with sync mutex package. There will be two goroutines which are dedicated to ping and pong the ball every second infinitely. We don't need them to communicate with each other so no need for channels. Instead, we will use a shared variable and let them access it at a time to avoid conflicts.

Example

package main

import (
	"fmt"
	"sync"
	"time"
)

type Ball struct {
	hit int
	mux sync.Mutex
}

func (b *Ball) Ping() {
	b.mux.Lock()
	defer b.mux.Unlock()

	b.hit++
	fmt.Println("Ping", b.hit)
}

func (b *Ball) Pong() {
	b.mux.Lock()
	defer b.mux.Unlock()

	b.hit++
	fmt.Println("Pong", b.hit)
}

func main() {
	ball := &Ball{}
	for {
		ball.Ping()
		time.Sleep(1 * time.Second)
		ball.Pong()
		time.Sleep(1 * time.Second)
	}
}

Test

Ping 1
Pong 2
Ping 3
Pong 4
Ping 5
Pong 6
Ping 7
Pong 8
Ping 9
Pong 10
Ping 11
Pong 12
...
...
...