Re: [libmicrohttpd] Expose the fdset events

[Christian Grothoff]

On 11/25/2012 05:07 PM, Simon Newton wrote:
> I use microhttpd with the Open Lighting Architecture. As I've posted
> before we have a C++ wrapper around libmicrohttpd (HTTPServer), which
> then integrates with OLA's event management system.
>
> While this works, it's rather messy. The wrapper sets up a call to a
> HTTPServer::UpdateSockets() method into the event loop, and
> UpdateSockets() calls MHD_get_fdset to find out what FDs microhttpd is
> interested in.
>
> It then loops over all the FDSETs and tries to reconcile the event
> manager's state with the desired state from microhttpd. This involves
> adding and removing Socket objects from the event manager.
>
> I'd prefer it if I could set a callback to be run each time a FD
> should be added or removed from the event manager. Is that easy enough
> to do?

"Easy enough" is hard to say, what I can say is that it would not be 
trivial.

However, that doesn't mean it will never happen --- something similar 
would be needed to make MHD work with epoll/kqueue-based event loops, 
which is in general a nice system call that in a perfect world MHD 
should be able to utilize.

Nevertheless, the change would be quite invasive and would require work 
that I won't be able to put in anytime soon.  So I guess what I'm saying 
is that, while I'm not opposed, I don't see this happen anytime soon 
unless I magically get a patch ;-).

Also, have you considered "improving" your event manager by extending 
its interface to allow it to work also with fdsets directly?  Depending 
on the system call that are you using internally in your event manager 
this might be trivial.


Happy hacking!

Christian