Re: [PATCH] /dev/epoll update ...

[Dan Kegel]

Jonathan Lemon wrote:
> 
> In article <local.mail.linux-kernel/[e-mail]> you write:
> >Right, and kqueue() can't even represent the 'level triggered' style --
> >or at least it isn't clear from the paper that it can!  
>
> Yes it does - kqueue() is 'level-triggered' by default.  

Apologies for the line noise.  I've corrected 
http://www.kegel.com/c10k.html to show kqueue as both edge- and level- triggered.
Further corrections welcome...

> As Christopher pointed out, any event can be converted into an
> edge-triggered style notification simply by setting EV_CLEAR.  However,
> this is not usually a popular model from a programmer's point of view,
> as it increases the complexity of their app.  (This is what I've seen, YMMV)

Agreed; the poll()-like semantics of level-triggering are particularly
forgiving.

- Dan