On Thu, Nov 3, 2016 at 8:37 PM, 刘桂祥 <liuguixiang...@gmail.com> wrote:
> // example.go
>
> package main
>
> var gMap = make(map[int]int)
>
> func w() {
> temp := make(map[int]int)
> temp[1] = 100
> temp[2] = 200
> gMap = temp // Does the compiler or cpu will reorder temp[1]=100,
> temp[2]=200, gMap=temp ??
> }
>
> func r() {
> local := gMap
> println(local[1], local[2])
> }
>
> func main() {
>
> go w()
> go r()
>
> // ...
> }
>
> I have one goroutine to read the map and one goroutine to rewrite the global
> map variable does this safe ??
No. Use a lock.
Ian
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