Method WaitCompletion

library/cpp/netliba/v12/ib_collective.cpp:766–774

        }

        void WaitCompletion(ibv_wc* res) {
            ibv_wc& wc = *res;
            for (;;) {
                int rv = CQ->Poll(&wc, 1);
                if (rv > 0 && ProcessSendCompletion(wc)) {
                   break;
                }
            }
        }

        bool TryWaitCompletion() override {
            ibv_wc wc;