[go-nuts] will the following code always print two 1?

[T L]

package main

import "fmt"
import "sync"
import "sync/atomic"

func main() {
    var a, b int32 = 0, 0
    
    go func() {
        a = 1
        atomic.AddInt32(&b, 1)
    }()
    
    for {
        if n := atomic.LoadInt32(&b); n == 1 {
            fmt.Println(a) // always print 1?
            break
        }
    }
    
    //======================
    
    var x, y int32 = 0, 0
    var m sync.Mutex
    
    go func() {
        x = 1
        m.Lock()
        y++
        m.Unlock()
    }()
    
    for {
        m.Lock()
        n := y
        m.Unlock()
        if n == 1 {
            fmt.Println(x) // always print 1?
            break
        }
    }
}

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