No output from goroutine in Go

Question

While SayHello() executes as expected, the goroutine prints nothing. package main import "fmt" func SayHello() { for i := 0; i < 10 ; i++ { fmt.Print(i, " ") } } func main() { SayHello() go SayHello() }

Gufran Mirza · Accepted Answer

When yourmain()function ends, your program ends as well. It does not wait for other goroutines to finish. Program execution begins by initializing the main package and then invoking the function main. When that function invocation returns, the program exits. It does not wait for other (non-main) goroutines to complete. You have to tell your main() function to wait for the SayHello() function started as a goroutine to complete. You can synchronize them with channels for example: func SayHello(done chan int) { for i := 0; i < 10; i++ { fmt.Print(i, " ") } if done != nil { done <- 0 // Signal that we're done } } func main() { SayHello(nil) // Passing nil: we don't want notification here done := make(chan int) go SayHello(done) <-done // Wait until done signal arrives }

Go Language

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