a demo for mutex lock

mutex.go

package main

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

type Nuclear struct {
	l     sync.Mutex
	value string
}

func (nu *Nuclear) getValue() string {
	// nu.l.Lock()
	v := nu.value
	// nu.l.Unlock()
	return v
}

func (nu *Nuclear) setValue(v string) {
	nu.l.Lock()
	defer nu.l.Unlock()
	nu.value = v
}

func main() {
	var n Nuclear

	go func() {
		i := 0
		for {
			time.Sleep(time.Second)
			n.setValue(fmt.Sprintf("hello world [%d]", i))
			i = i + 1
		}
	}()

	go func() {
		for {
			time.Sleep(time.Second)
			val := n.getValue()
			fmt.Println(val)
		}

	}()

	for {
		time.Sleep(time.Second)
	}
}