https://go.dev/ref/spec#Go_statements :
> The function value and parameters are evaluated as usual <https://go.dev/ref/spec#Calls> in the calling goroutine, but unlike with a regular call, program execution does not wait for the invoked function to complete. http.ListenAndServe is being evaluated, but it blocks. Only the log.Println call would run in the newly started goroutine. On Friday, February 18, 2022 at 5:35:52 PM UTC+1 christoph...@gmail.com wrote: > Hi gophers, > > I hope someone can help finding out why a particular goroutine call can > block the main goroutine. > > In the following code, all "go" calls spawn off a goroutine and return as > expected, except for the last one that blocks the main goroutine. > > Is this a bug, or am I missing something subtle or even obvious (obvious > to all others only of course)? > > package main > > import ( > "log" > "net/http" > ) > > func main() { > // all of these work as expected > go http.ListenAndServe("localhost:8080", nil) > go log.Println("goroutine") > go func() { > log.Println(http.ListenAndServe("localhost:8081", nil)) > }() > > // The following line blocks the main goroutine. > go log.Println(http.ListenAndServe("localhost:8082", nil)) > > log.Println("after go log.Println(http.ListenAndServe())") // > never prints > select {} // remove this, and the code still never finishes > } > > All three servers eventually run (try curl localhost:8080; curl > localhost:8081; curl localhost:8082), > > In the playground <https://go.dev/play/p/vObgGGM7MJD>, the code even > deadlocks. > > Any idea? > > -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/golang-nuts/7b55e78f-4f8e-4be6-b3ab-6e65109f6522n%40googlegroups.com.
