Fixing a race condition with a mutex (trivial example)

main.go

package main

import (
	"fmt"
	"sync"
)

func main() {
	finished := make(chan bool, 1)

	var i int
	var mutex sync.Mutex

	go func() {
		mutex.Lock()
		fmt.Println("In the Go routine reading to increment i")
		i++
		fmt.Println("New value of i:", i)
		mutex.Unlock()
		finished <- true
	}()

	mutex.Lock()
	i++
	mutex.Unlock()
	<-finished
	fmt.Println("Finished!")
}