mutexes.go

// Simplest mutex example

package main

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

func main() {

	count := 0
	var m sync.Mutex

	write := func() {
		m.Lock()
		for i := 0; i < 100; i++ {
			count+=10
		}
		m.Unlock()
	}

	go write()
	go write()

	time.Sleep(time.Millisecond * 5)
	fmt.Printf("Count: %v", count) // should be 2000
}