I have a go program that uses a goroutine to read UDP packets. I wanted to use a select clause and a "stopping" channel to close the goroutine to shut down as soon as it is not needed anymore.
Here is a simple code example for the goroutine:
func Run(c chan string, q chan bool, conn *net.UDPConn) {
defer close(c)
buf := make([]byte, 1024)
for {
select {
case <- q:
return
default:
n, _, err := conn.ReadFromUDP(buf)
c <- string(buf[0:n])
fmt.Println("Received ", string(buf[0:n]))
if err != nil {
fmt.Println("Error: ", err)
}
}
}
}
The connection is created as:
conn, err := net.ListenUDP("udp",addr.Addr)
And the goroutine is supposed to terminate using:
close(q)
After closing the "stopping" channel ("q") the goroutine does not immediately stop. I need to send one more string via the UDP connection. When doing so the goroutine stops. I simply do not understand this behaviour and I would be grateful if somebody could enlighten me.
Thank you in advance!