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Inherited from posix::basic_descriptor.
Sets the non-blocking mode of the descriptor.
void non_blocking(
bool mode,
boost::system::error_code & ec);
If true, the descriptor'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.