> On Mon, Jul 23, 2001 at 11:57:44PM +0200, Markus Fischer wrote:
> > On Mon, Jul 23, 2001 at 11:15:49PM +0200, Stig Venaas wrote :
> > Chris mentioned something that its not needed to restore the last
> > highest value for the max_fd if you drop the current highest one.
>
> I agree, it would only be for efficiency. I think now that the
> best solution is to just store the max. If clear.. is called
> with the current max, we can start at max and going downwards
> we can do FD_ISSET on each number until we find something that
> is set. Then we have the new max.
You can store the max, but it's not necessary to decrease it if someone
does FD_CLR() on a FD in the set. The only negative effect specifying a
larger value to select() has is extra loops in kernel space.
>
> > This makes me wondering why we not ever pass something like
> > 0xffffffff to select() [of course there is some legal reason not
> > to do this, i'm just curious now].
>
> Maybe, but I don't like it. Are you sure there are may not be bad
> things happening if the number is outside the size of the set?
See above.
BTW, you never specify 0xffffffff to select() anyway.
0xffffffff = (int) -1. :)
>
> > One the other hand, Daniel [afaik??] suggested to let the user
> > retrieve the handle id for a socket and calculate the hightest
> > value on its own. Something like
> >
> > $fd = socket_get_fd( $socket);
> >
> > comes into my mind.
> >
> >
> > The first one would be more nice for the users while the later is
> > much less programming effort :-)
>
> Yes, I think we should be nice to the users though (: There's less
> time wasted by doing it once in C than having many PHP programmers
> doing it over and over again...
>
I can't see why a user would ever need access to the actual file
descriptor returned.
> > I'm just wondering if there can be ever any drawback if we don't
> > let the user specify the first parameter to the select() call.
> >
> > As I'm not an expert I can't tell.
>
> I'm no expert, but I really can't see why it's needed (:
>
Nor do i. :)
Chris
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