def send_picture(picture, *args)
      @mtx.synchronize do
        raise DeadActorError if not @running
        Zsock.send(ffi_delegate, picture, *args)
      end
    end
def send_picture(picture, *args)
      @mtx.synchronize do
        raise DeadActorError if not @running
        Zsock.send(ffi_delegate, picture, *args)
      end
    end
Sends a message according to a "picture".
 @see zsock_send() on http://api.zeromq.org/czmq3-0:zsock
 @note Mainly added for {Beacon}. If implemented there, it wouldn't be
   thread safe. And it's not that useful to be added to
   {SendReceiveMethods}.
 @param picture [String] message's part types
 @param args [String, Integer, ...] values, in FFI style (each one
   preceeded with it's type, like <tt>:string, "foo"</tt>)
 @return [void]