Gets the non-blocking mode of the acceptor.
bool non_blocking() const;
true
if the acceptor's synchronous
operations will fail with asio::error::would_block
if they are unable to perform the requested operation immediately. If
false
, synchronous operations
will block until complete.
The non-blocking mode has no effect on the behaviour of asynchronous
operations. Asynchronous operations will never fail with the error asio::error::would_block
.