Broadcast a signal on a channel
yourbasic.org/golang
All readers receive zero values on a closed channel.
In this example the Publish function returns a channel, which is used to broadcast a signal when a message has been published.
// Print text after the given time has expired.
// When done, the wait channel is closed.
func Publish(text string, delay time.Duration) (wait <-chan struct{}) {
ch := make(chan struct{})
go func() {
time.Sleep(delay)
fmt.Println("BREAKING NEWS:", text)
close(ch) // Broadcast to all receivers.
}()
return ch
}Notice that we use a channel of empty structs: struct{}. This clearly indicates that the channel will only be used for signalling, not for passing data.
This is how you may use the function.
func main() {
wait := Publish("Channels let goroutines communicate.", 5*time.Second)
fmt.Println("Waiting for news...")
<-wait
fmt.Println("Time to leave.")
}Waiting for news... BREAKING NEWS: Channels let goroutines communicate. Time to leave.
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