go同步互斥锁

import "sync"
var (
    myMap = make(map[int]int, 10)
    lock sync.Mutex
    //声明一个全局的互斥锁
    //sync 包 同步
    // Mutex：是互斥
)

func test(n int){
    res := 1
    for i:=1;i<=n;i++{
        res *=1
    }
    lock.Lock()
    myMap[n] = res //concurrent map write
    lock.Unlock()
}

func main(){
    for i :=1;i<200;i++{
        go test(i)
    }
}