Quoting r. Christopher C. Aycock <[EMAIL PROTECTED]>: > For example, is there any way to have IBverbs invoke a callback > function when an item arrives on the completion queue? The IBA spec > mentions a "Completion Event Handler"; is this what I'm looking for? > If so, how do I use it in IBverbs?
No. This would require creating a thread behind the scenes and Roland didn't want to do that. You can create a thread yourself and call ibv_get_cq_event from there. > One function I'm kind of confused with is ibv_req_notify_cq(). Is the > second parameter simply a true / false value? This isn't very obvious > since the rc_pingpong.c example file passes a 0 value when it > requests CQ notification. Yes. > Another confusing one is ibv_get_cq_event(). Am I correct in assuming > that this is a blocking function? That's the impression I get from > the example codes and from the fact that struct ibv_comp_channel > appears to merely consist of a file descriptor. My impression is that > it "wakes up" when an element appears on the CQ, No, when a completion event is triggered. A single event might signal multiple completions. > but that it requires > the use of ibv_poll_cq() to actually obtain that element. Is this > correct? Yes. -- Michael S. Tsirkin Staff Engineer, Mellanox Technologies _______________________________________________ openib-general mailing list [email protected] http://openib.org/mailman/listinfo/openib-general To unsubscribe, please visit http://openib.org/mailman/listinfo/openib-general
