Hi, On Wed, Feb 26, 2003 at 09:30:08AM +1100, Martijn van Oosterhout wrote: > SANE supports a backend being non-blocking. Does that mean "don't ever > block" or "don't ever block for long periods of time"? For example, the > warming up of the lamp can take a while so you'd like to support non-block > for that. OTOH, we can't support non-block for the USB reads and writes. But > they don't take very long.
The non-blocking mode is only relevant for sane_read. As warm-up is ususally done in sane_start, it's not really relevant here. Non-block means: if you have no data, return immediately. Blocking means: Only return if you have at least one byte of data (or an error occured). Bye, Henning
