如何确保Golang大猩猩WebSocket包中的并发

I have studied the Godoc of the gorilla/websocket package.

In the Godoc it is clearly stated that

Concurrency Connections support one concurrent reader and one concurrent writer.

Applications are responsible for ensuring that no more than one goroutine calls the write methods (NextWriter, SetWriteDeadline, WriteMessage, WriteJSON, EnableWriteCompression, SetCompressionLevel) concurrently and that no more than one goroutine calls the read methods (NextReader, SetReadDeadline, ReadMessage, ReadJSON, SetPongHandler, SetPingHandler) concurrently.

The Close and WriteControl methods can be called concurrently with all other methods.

However, in one of the example provided by the package

func (c *Conn) readPump() {
    defer func() {
        hub.unregister <- c
        c.ws.Close()
    }()
    c.ws.SetReadLimit(maxMessageSize)
    c.ws.SetReadDeadline(time.Now().Add(pongWait))
    c.ws.SetPongHandler(func(string) error { 
        c.ws.SetReadDeadline(time.Now().Add(pongWait)); return nil
    })
    for {
        _, message, err := c.ws.ReadMessage()
        if err != nil {
            if websocket.IsUnexpectedCloseError(err, websocket.CloseGoingAway) {
                log.Printf("error: %v", err)
            }
            break
        }
        message = bytes.TrimSpace(bytes.Replace(message, newline, space, -1))
        hub.broadcast <- message
    }
}

This line

c.ws.SetPongHandler(func(string) error { 
    c.ws.SetReadDeadline(time.Now().Add(pongWait)); return nil
})

and this line

_, message, err := c.ws.ReadMessage()

serveWs

SetReadDeadlineReadMessageSetPongHandlerSetPingHandler

ReadMessage

Is there any better way in handling this concurrency issue? Thanks in advance.