[openib-general] Re: ibv_get_async_event

[Sean Hefty]

Roland Dreier wrote:
>     Arlin> Shouldn't there be a new ibv_put_cq_event() to go with the
>     Arlin> ibv_get_cq_event() ?
> 
> No, I think that's dealt with by sweeping the CQ in userspace when
> destroying a QP.

I don't think that sweeping the CQ in userspace eliminates the race.  The call 
to ibv_get_cq_event() can be just about to return to the user when they call 
destroy in a separate thread.  Destroy has no way of blocking, so get could 
return an invalid pointer.

- Sean