go传统的同步机制

sync.Mutex

Lock()
unLock()

import (
	"sync"
	"time"
)
type atomic struct {
	value int
	lock  sync.Mutex
}
func (a *atomic) increment() {
	a.lock.Lock()
	defer a.lock.Unlock()
	a.value++
}
func (a *atomic) get() int {
	a.lock.Lock()
	defer a.lock.Unlock()
	return a.value
}`

func main() {
	var a atomic
	a.increment()
	go func() {
		a.increment()
	}()
	time.Sleep(time.Second)
	println(a.get())
}
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通过匿名函数，创建一个让锁生效的代码区

lock和d efer unlock在该函数体内生效

	fmt.Println("safe inrement")
	func() {
		a.lock.Lock()
		defer a.lock.Unlock()
		a.value++
	}()

}```
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