KITFORMA · EDITORIAL ANSWER
Why can Wait return early when Add happens inside a new goroutine?
KitForma editorial guide. The waiter can observe zero before the scheduled worker increments the counter. Scheduling does not establish registration order.
Step-by-step answer
The waiter can observe zero before the scheduled worker increments the counter. Scheduling does not establish registration order.
For the established Add/Done pattern, register before launch:
package main
import ("fmt"; "sync")
func main() {
var wg sync.WaitGroup
wg.Add(1)
go func() { defer wg.Done(); fmt.Println("done") }()
wg.Wait()
}Verify all paths call Done exactly once. Newer convenience APIs require checking the project’s minimum Go version and their contract. A WaitGroup tracks completion only: it does not carry errors, cancel work or synchronize every access to shared application data.
Sources and verification
Sources checked:
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