Re: A question about comm_select.

Dear All

As much as I know using a system call has a lot of overhead,
so Is it logical that using select three or more times, while
we can use it just once?

Regards,
V.Fk

On Sat, 24 Feb 2001, Henrik Nordstrom wrote:

> cachemail@procache.com wrote:
> >
> > Dear All,
> > In the comm_select, there are special code for icp and http, and we
> > check them at the beginging by using comm_select_icp_incoming and
> > comm_select_http_incoming, each one has its own select. In the main
> > part of comm_select we use another select. In some parts of there codes
> > there are some commDeferRead()s. I have some questions as follow:
> >
> > 1) Why there are seperated part for select and is it possible to
> > use just one select instead?
>
> Because these are checked more often than the other filedescriptors.
>
> >
> > 2) Why do we use seperated commDeferRead()s in each part? There
> > are
> > commDeferRead()s after the main select(). I think before
> > the select and after that we check the commDeferRead().
> > Why? Is it possible to do it just once?
>
> It is called per connection.
>
> --
> Henrik Nordstrom
> Squid hacker
>
Received on Sun Feb 25 2001 - 08:44:28 MST