If you execute it you are told on which lines the deadlock happens...
fatal error: all goroutines are asleep - deadlock!
goroutine 1 [chan send]:
main.main.func2()
/Users/emuller/go/src/github.com/freeformz/tt/main.go:25 +0xce
main.main()
/Users/emuller/go/src/github.com/freeformz/tt/main.go:37 +0x118
exit status 2
main.go:25 is the line that says `done <- true`.
The `done` channel isn't buffered and the first loop through will select
that path, but there is not another goroutine selecting from done. so f()
never returns. Deadlock.
On Thu, Sep 1, 2016 at 10:04 AM Darren Hoo <darren....@gmail.com> wrote:
> var wg sync.WaitGroup
>
> ints := make(chan int, 1)
> done := make(chan bool)
>
> go func() {
> for i := 0; i < 3; i++ {
> ints <- i
> }
> close(ints)
> }()
>
> f := func() {
> wg.Add(1)
> defer wg.Done()
>
> for {
> i, ok := <-ints
> if !ok {
> done <- true
> return
> }
> }
> }
>
> exit:
> for {
> select {
> case <-done:
> break exit
> default:
> f()
> }
> }
> wg.Wait()
>
>
>
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