Am Donnerstag, 4. Januar 2007 18:00 schrieb Alan Stern:
> On Thu, 4 Jan 2007, Oliver Neukum wrote:
>
> > Am Donnerstag, 4. Januar 2007 16:38 schrieb Alan Stern:
> >
> > > I don't know what you mean by "RESPONSE_AVAILABLE is reliable in one
> > > direction only". The message should be treated as a hint that data may
> > > be
> > > available so the host should attempt to start a transfer -- but it's
> > > still
> > > possible that no data bytes are available.
> >
> > I do read the spec in the way that there may be no pending response without
> > RESPONSE_AVAILABLE.
>
> All it says is "using any appropriate algorithm", which is not very clear.
> Somebody might think their algorithm was appropriate even though it
> doesn't always send RESPONSE_AVAILABLE the instant a response becomes
> pending.
>
> For instance, let's say the RESPONSE_AVAILABLE message is sent over an
> interrupt endpoint with an interval of 4 ms. This means there could be a
> window up to 4 ms long between the time some response data becomes
> pending and the time the RESPONSE_AVAILABLE message is sent to the host.
If it comes eventually, I am happy. This is not critical to performance.
However, it must be in kernel space for security reasons.
Regards
Oliver
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