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On Mon, 23 Oct 2000, Dan Kegel wrote:
>
> kqueue lets you associate an arbitrary integer with each event
> specification; the integer is returned along with the event.
> This is very handy for, say, passing the 'this' pointer of the
> object that should handle the event. Yes, you can simulate it
> with an array indexed by fd, but I like having it included.

I agree. I thin the ID part is the most important part of the interfaces,
because you definitely want to re-use the same functions over and over
again - and you wan tto have some way other than just the raw fd to
identify where the actual _buffers_ for that IO is, and what stage of the
state machine we're in for that fd etc etc.

Also, it's potentially important to have different "id"s for even the same
fd - in some cases you want to have the same event handle both the read
and the write part on an fd, but in other cases it might make more
conceptual sense to separate out the read handling from the write
handling, and instead of using "mask = POLLIN | POLLOUT", you'd just have
two separate events, one with POLLIN and one with POLLOUT.

This was what my "unsigned long id" was, but that is much too hard to use.
See my expanded suggestion of it just a moment ago.

(And yes, I'm sure you can do all this with kevents. I just abhor the
syntax of those things).

Linus

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