It's only polite to let other's know when cross-posting questions, to avoid
wasting time.
https://stackoverflow.com/questions/44657084/why-main-goroutine-always-be-the-second-to-be-invoked
The answer and comments there seems to cover most aspects of the behavior
you're seeing.
On Tuesday, June 20, 2017 at 1:10:34 PM UTC-4, Jun An wrote:
>
> here is the code, why can't main goroutine be a little quick and exit then
> discard another goroutine?
>
> package main
>
> import (
> "sync"
> "time"
> )
>
> func main() {
> var wg sync.WaitGroup
>
> wg.Add(1)
>
> go func() {
> wg.Wait()
> println("wait exit")
> }()
>
> go func() {
> time.Sleep(time.Second)
> wg.Done()
> }()
>
> wg.Wait()
> println("main exit")
> }
>
>
>
>
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