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Inherited from posix::descriptor.
Sets the non-blocking mode of the native descriptor implementation.
void native_non_blocking(
    bool mode);
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.
                  If true, the underlying descriptor is put into non-blocking
                  mode and direct system calls may fail with boost::asio::error::would_block
                  (or the equivalent system error).
                
                  Thrown on failure. If the mode is false,
                  but the current value of non_blocking() is true,
                  this function fails with boost::asio::error::invalid_argument,
                  as the combination does not make sense.