Is it possible to determine that a data sending channel no longer accepts messages?

In Go, you can determine that a channel no longer receives messages by checking if it is closed. When reading from a closed channel, the read operation returns the zero value and the second parameter ok is false.

Example:

ch := make(chan int)
close(ch) // Closing the channel

v, ok := <-ch
if !ok {
    fmt.Println("Channel is closed and no longer receives messages")
}

Important: You cannot send to a closed channel — this will cause a panic. Therefore, usually the sender closes the channel, and receivers check if the channel is closed to understand that no more messages will be sent.