Re: [go-nuts] does Go memory model guarantee this program always prints 1?

[T L]

On Friday, July 7, 2017 at 3:26:24 AM UTC+8, Lars Seipel wrote:
>
> On Thu, Jul 06, 2017 at 12:19:05PM -0700, T L wrote: 
> > 
> > package main 
> > 
> > import "fmt" 
> > import "sync/atomic" 
> > 
> > func main() { 
> >     var x int32 
> >     atomic.AddInt32(&x, 1) 
> >     fmt.Println(atomic.LoadInt32(&x)) 
> > } 
>
> Sure. 
>
> > Within a single goroutine, the happens-before order is the order 
> > expressed by the program. 
> - https://golang.org/ref/mem


Thanks.

Then how about this?

package main

import "fmt"
import "sync/atomic"

func main() {
    var x, y int32
    go func() {
        atomic.AddInt32(&x, 1)
        atomic.AddInt32(&y, 1)
    }()
    
    if atomic.LoadInt32(&y) == 1 {
        fmt.Println("x =", atomic.LoadInt32(&x)) // always 1 if it is 
printed?
    }
    
    if atomic.LoadInt32(&x) == 0 {
        fmt.Println("y =", atomic.LoadInt32(&y)) // always 0 if it is 
printed?
    }
}
 

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