Hi, you need to spin up another goroutine which ranges over the channel: https://play.golang.org/p/OhLd6vOBYE
The reason for the deadlock is: You spin up N workers which are sending the results over the "fact_chan"-Channel. After you did this, you are listening on the main-routine for messages on fact_chan forever. But after all of the workers finished their tasks, there is nobody to send data. The runtime detects this and panics. - Jannick Am 04.08.2017 um 17:11 schrieb prankpla...@gmail.com: > *Factorial Program in GoLang. Encountering deadlock.* > * > * > *Hello All,* > * > * > I am pretty new to GoLang , so please excuse me if question/doubt is silly. > > I am trying to write a Factorial program of numbers ranging from 0 to 5. > My goal is to launch separate GO routines for each number and then > collect o/p and print it. I have tries writing code which can be seen > @ https://play.golang.org/p/MTzTuroxE5 (also below) .. but i am > encountering DEADLOCK error. I have been trying to synchronize it but i > have failed to do it so far. Please help me in understanding that how > else i can write this program so that i properly close sending channel > to avoid error. > > -- > package main > > import ( > "fmt" > "sync" > ) > > var wg sync.WaitGroup > > func factorial(x int) int { > if x > 0 { > return x*factorial(x-1) > } > return 1 > } > > func fact_worker(fact_resp_chan chan string, x int) { > defer wg.Done() > response := factorial(x) > fact_resp_chan <- fmt.Sprintf("Factorial of %d is : %d", x, response) > } > > > func main() { > fact_chan := make(chan string) > > for n := 0; n <=5 ; n++ { > wg.Add(1) > go fact_worker(fact_chan, n) > } > > > > for resp := range(fact_chan) { > fmt.Printf("%s\n", resp) > } > wg.Wait() > > } > -- > > Thanks! > > -- > 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 > <mailto:golang-nuts+unsubscr...@googlegroups.com>. > For more options, visit https://groups.google.com/d/optout. -- 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. For more options, visit https://groups.google.com/d/optout.
