  This function is used to modify the non-blocking mode of the underlying
            native descriptor. It has no effect on the behaviour of the descriptor
            object's synchronous operations.
          </p>
<h6>
<a name="boost_asio.reference.posix__stream_descriptor.native_non_blocking.overload3.h0"></a>
            <span class="phrase"><a name="boost_asio.reference.posix__stream_descriptor.native_non_blocking.overload3.parameters"></a></span><a class="link" href="overload3.html#boost_asio.referen