can you explain why whis ?
在 2016年11月4日星期五 UTC+8下午1:16:39，Ian Lance Taylor写道：
>
> On Thu, Nov 3, 2016 at 8:37 PM, 刘桂祥 <liuguix...@gmail.com <javascript:>>
> 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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