[openib-general] Re: uCM create connection ID

[Libor Michalek]

On Tue, Jun 28, 2005 at 01:59:01PM -0700, Arlin Davis wrote:
> Hi Libor,
> 
> I have a couple of uCM questions regarding create_id and events...
> 
> Is it possible for a consumer of uCM to provide a context with the 
> create_id that could be returned with the event? I will have some scale 
> up issues if I have to walk a list looking for a uCM provided connection 
> ID instead of a context that could point directly to the appropriate 
> uDAPL CM object.

  It would be easy to add in a context variable. I had left it out on
purpose, since it's easy to get into a situation where using the context
as a pointer you can end up referencing deallocated memory. However, I
suppose it should be there for flexability.

> It would also be very helpful if the CM event could be woke from user space.

  You mean break CM event out of it's wait? I would instead recommend that
you call poll on the file descriptor for read readiness, and only call for
the CM event when there's an event available. Also, if you insist on using
threads, tou can break out of poll by sending a signal to the thread that
is waiting on the poll, which will return -1 with an errno of EINTR.


-Libor