On Tue, Sep 5, 2017 at 10:34 AM, Marlon Che <rob198...@gmail.com> wrote:
> Hi everyone!
> Please help me figure out the two different results of following code:
>
> package main
>
> import (
> "fmt"
> "time"
> )
>
> func main() {
> var num = 10
> var p = &num
>
> c := make(chan int)
>
> go func() {
> c <- *p // with this line we will get 11 from channel c
> //c <- num // with this line we will get 10 from channel c
> }()
>
> time.Sleep(2 * time.Second)
> num++
> fmt.Println(<-c)
>
> fmt.Println(p)
> }
You have a data race, what value you get from dereferencing p is
undefined, it could be 10, it could be 11, it could wipe your
harddrive or launch the missiles.
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