Nate Lawson wrote:
Scott Long wrote:
Andrew Gallatin wrote:
Scott Long writes:
> However, taskqueues are really just a proof of concept for what I
really
> want, which is to allow drivers to register both a fast handler
and an
> ithread handler. For drivers doing this, the ithread would be
private
Ah, the darwin / MacOSX model. That would be very cool.
Yep. Working in IOKit was very interesting, and this is one of the few
things that transfers well to FreeBSD. C++ does have a certain elagence
for drivers, but the cost of virtual methods in the fast path of the
driver and stack is still far too high to justify using it.
Yeah, that's why newbus is only for configuration but interrupt handlers
are called directly. It's nice to have OO for config and relationships
between devices but just direct calls for the fast path.
It's not just the interrupt handlers, everything is abstracted behind
virtual methods in IOKit.
Scott
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