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Sets the non-blocking mode of the socket.
void non_blocking(
    bool mode,
    boost::system::error_code & ec);
                  If true, the socket's synchronous operations will
                  fail with boost::asio::error::would_block if they
                  are unable to perform the requested operation immediately. If
                  false, synchronous operations will block until complete.
                
Set to indicate what error occurred, if any.
            The non-blocking mode has no effect on the behaviour of asynchronous
            operations. Asynchronous operations will never fail with the error boost::asio::error::would_block.