This discussion should probably move to the freebsd-scsi list...
"Kenneth D. Merry" <[EMAIL PROTECTED]> writes:
>Nick Hibma wrote...
>> Especially some help on the topic of polling would be appreciated.
>> Otherwise I'll have to resort to figuring out how to do things in
>> interrupt context, and that is going to be dirty.
>If you're talking about polling for transaction completion in a device
>driver, my guess is that you're going to have to do things in an interrupt
>context. (Unless you use a kernel process to do it.)
>
>The thing to remember is that when you get CCBs down in a CAM device
>driver, it may well be in an interrupt context. You have to be able to
>deal with that. My guess is that it might be easiest to just use a timeout
>handler to poll the device for completion every so often. A kernel process
>may also be an option, depending on how nasty the device is.
Ick. Polling == bad. Interrupts == good. This isn't a single-
tasking OS ala Win9x. This goes double for SCSI drivers, which are
inherently async and overlapped.
--
Randell Jesup, Worldgate Communications, ex-Scala, ex-Amiga OS team ('88-94)
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