Gets the non-blocking mode of the native acceptor implementation.
bool native_non_blocking() const;
This function is used to retrieve the non-blocking mode of the underlying native acceptor. This mode has no effect on the behaviour of the acceptor object's synchronous operations.
true if the underlying acceptor is in non-blocking mode
and direct system calls may fail with
(or the equivalent system error).
The current non-blocking mode is cached by the acceptor object. Consequently, the return value may be incorrect if the non-blocking mode was set directly on the native acceptor.