On Wed, Nov 17, 2021 at 6:43 AM Ting Yuan <yuanting1...@gmail.com> wrote:
> I am confused, why there is no data race in the above program. I'm using
> go1.17.2 linux/amd64
>
The race detector is a heuristic. That it doesn't report a race does not
mean there is none. Races are non-deterministic, so it's very possible that
any particular run just didn't trigger one.
This slightly modified version of the same race triggers the race-detector
reliably for me:
func f() {
wg := new(sync.WaitGroup)
defer wg.Wait()
a := 1
wg.Add(1)
go func() {
defer wg.Done()
fmt.Print(a)
a = 3
}()
fmt.Print(a)
}
func main() {
for i := 0; i < 1000; i++ {
f()
}
}
I just added a bit of synchronization to replace the time.Sleep and called
the code 1000 times, to increase the likelihood of triggering the race.
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