go - golang all goroutines are asleep - deadlock

Question

I got an error when running follow golang snippet. I think the progress will block at wg.Wait() until the go routine is over. then the value would be obtained from c1. But it may not proceed as expected.

func main() {

c1 := make(chan string)
//var c1 chan string
var wg sync.WaitGroup

wg.Add(1)
go func() {
    defer wg.Done()
    fmt.Printf("go routine begin
")
    time.Sleep(1 * time.Second)
    c1 <- "one"
    fmt.Printf("go routine done
")
}()
wg.Wait()
fmt.Printf("done c1: %v
", <-c1)
fmt.Printf("out
")
}

the error info is,

 go routine begin
 fatal error: all goroutines are asleep - deadlock!

Answer 1

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