Method FlushOutputBuffers

library/cpp/neh/tcp2.cpp:844–870

called non thread-safe (from outside thread)

                //called non thread-safe (from outside thread)
                bool FlushOutputBuffers(bool asioThread, TRequestId reqId) {
                    if (asioThread || TTcp2Options::ClientUseDirectWrite) {
                        TContIOVector& vec = *OutputBuffers_.GetIOvec();
                        TErrorCode err;
                        vec.Proceed(AS_.WriteSome(vec, err));

                        if (Y_UNLIKELY(err)) {
                            if (asioThread) {
                                OnErrorCode(err);
                            } else {
                                AS_.GetIOService().Post(std::bind(&TConnection::OnErrorCode, TConnectionRef(this), err));
                            }
                            return false;
                        }

                        if (vec.Complete()) {
                            LastSendedReqId_.store(reqId, std::memory_order_release);
                            DBGOUT("Client::FlushOutputBuffers(" << reqId << ")");
                            OutputBuffers_.Clear();
                            return true;
                        }
                    }

                    DBGOUT("Client::AsyncWrite(" << reqId << ")");
                    AS_.AsyncWrite(OutputBuffers_.GetIOvec(), std::bind(&TConnection::OnSend, TConnectionRef(this), reqId, _1, _2, _3), TTcp2Options::ServerOutputDeadline);
                    return false;
                }

                //must be called only from asio thread
                void OnSend(TRequestId reqId, const TErrorCode& ec, size_t amount, IHandlingContext&) {