Brian Buhrow <buh...@nfbcal.org> writes: > hello. I don't necessarily need the read ahead functionality, though > it might be useful when I start doing large transfers to and from the Apple > devices. However, what I want is the non-blocking functionality which, > according to the manual, requires I use the read ahead code to get. It > appears, however, that the non-blocking functionality is minimally tested > and may not work as advertised. Also, it looks like the timeout > functionality may not be quite right either, though I've not investigated > that as thoroughly yet.
So perhaps we should step back and ask why non-blocking doesn't work. Part of it is that reading from a USB device causes bus transactions, so even reading is an active step. The next question is if it makes sense within USB to have a pending read, or if you can try to read and either succeed or find nothing. I think we need a really clear understanding of all of that (which I may have had at one point) before trying to fix.
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