yanglimingcn commented on code in PR #3290: URL: https://github.com/apache/brpc/pull/3290#discussion_r3217595471
########## src/brpc/ubshm_transport.cpp: ########## @@ -0,0 +1,241 @@ +// Licensed to the Apache Software Foundation (ASF) under one +// or more contributor license agreements. See the NOTICE file +// distributed with this work for additional information +// regarding copyright ownership. The ASF licenses this file +// to you under the Apache License, Version 2.0 (the +// "License"); you may not use this file except in compliance +// with the License. You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, +// software distributed under the License is distributed on an +// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY +// KIND, either express or implied. See the License for the +// specific language governing permissions and limitations +// under the License. + +#if BRPC_WITH_UBRING + +#include "brpc/ubshm_transport.h" +#include "brpc/tcp_transport.h" +#include "brpc/ubshm/ub_endpoint.h" +#include "brpc/ubshm/ub_helper.h" + +namespace brpc { +DECLARE_bool(usercode_in_coroutine); +DECLARE_bool(usercode_in_pthread); + +extern SocketVarsCollector *g_vars; + +void UBShmTransport::Init(Socket *socket, const SocketOptions &options) { + CHECK(_ub_ep == NULL); + if (options.socket_mode == SOCKET_MODE_UBRING) { + _ub_ep = new(std::nothrow)ubring::UBShmEndpoint(socket); + if (!_ub_ep) { + const int saved_errno = errno; + PLOG(ERROR) << "Fail to create UBShmEndpoint"; + socket->SetFailed( + saved_errno, "Fail to create UBShmEndpoint: %s", berror(saved_errno)); + } + _ub_state = UB_UNKNOWN; + } else { + _ub_state = UB_OFF; + socket->_socket_mode = SOCKET_MODE_TCP; + } + _socket = socket; + _default_connect = options.app_connect; + _on_edge_trigger = options.on_edge_triggered_events; + if (options.need_on_edge_trigger && _on_edge_trigger == NULL) { + _on_edge_trigger = ubring::UBShmEndpoint::OnNewDataFromTcp; + } + _tcp_transport = std::unique_ptr<TcpTransport>(new TcpTransport()); + _tcp_transport->Init(socket, options); +} + +void UBShmTransport::Release() { + if (_ub_ep) { + delete _ub_ep; + _ub_ep = NULL; + _ub_state = UB_UNKNOWN; + } +} + +int UBShmTransport::Reset(int32_t expected_nref) { + if (_ub_ep) { + _ub_ep->Reset(); + _ub_state = UB_UNKNOWN; + } + return 0; +} + +std::shared_ptr<AppConnect> UBShmTransport::Connect() { + if (_default_connect == nullptr) { + return std::make_shared<ubring::UBConnect>(); + } + return _default_connect; +} + +int UBShmTransport::CutFromIOBuf(butil::IOBuf *buf) { + if (_ub_ep && _ub_state != UB_OFF) { + butil::IOBuf *data_arr[1] = {buf}; + return _ub_ep->CutFromIOBufList(data_arr, 1); + } else { + return _tcp_transport->CutFromIOBuf(buf); + } +} + +ssize_t UBShmTransport::CutFromIOBufList(butil::IOBuf **buf, size_t ndata) { + if (_ub_ep && _ub_state != UB_OFF) { + return _ub_ep->CutFromIOBufList(buf, ndata); + } + return _tcp_transport->CutFromIOBufList(buf, ndata); +} + +int UBShmTransport::WaitEpollOut(butil::atomic<int> *_epollout_butex, + bool pollin, const timespec duetime) { + // LOG(INFO) << "mwj pollin4=" << pollin << " duetime=" << butil::timespec_to_microseconds(duetime); + if (_ub_state == UB_ON) { + // LOG(INFO) << "mwj pollin1=" << pollin; + const int expected_val = _epollout_butex->load(butil::memory_order_acquire); + CHECK(_ub_ep != NULL); + if (!_ub_ep->IsWritable()) { + g_vars->nwaitepollout << 1; + _ub_ep->PollerRegisterEpollOut(pollin); + auto mwj_ret = bthread::butex_wait(_epollout_butex, expected_val, &duetime); + // LOG(INFO) << "mwj pollin2=" << pollin << " mwj_ret=" << mwj_ret; + if (mwj_ret < 0) { + if (errno != EAGAIN && errno != ETIMEDOUT) { + const int saved_errno = errno; + PLOG(WARNING) << "Fail to wait ub window of " << _socket; + _socket->SetFailed(saved_errno, + "Fail to wait ub window of %s: %s", + _socket->description().c_str(), + berror(saved_errno)); + } + if (_socket->Failed()) { + // NOTE: + // Different from TCP, we cannot find the UB channel + // failed by writing to it. Thus we must check if it + // is already failed here. + return 1; + } + } + _ub_ep->PollerUnRegisterEpollOut(pollin); + } + } else { + return _tcp_transport->WaitEpollOut(_epollout_butex, pollin, duetime); + } + // LOG(INFO) << "mwj return 0"; + return 0; +} + +void UBShmTransport::ProcessEvent(bthread_attr_t attr) { + bthread_t tid; + if (FLAGS_usercode_in_coroutine) { + OnEdge(_socket); + } else if (ubring::FLAGS_ub_edisp_unsched == false) { + auto rc = bthread_start_background(&tid, &attr, OnEdge, _socket); + if (rc != 0) { + LOG(FATAL) << "Fail to start ProcessEvent"; + OnEdge(_socket); + } + } else if (bthread_start_urgent(&tid, &attr, OnEdge, _socket) != 0) { + LOG(FATAL) << "Fail to start ProcessEvent"; + OnEdge(_socket); + } +} + +void UBShmTransport::QueueMessage(InputMessageClosure& input_msg, + int* num_bthread_created, bool last_msg) { + if (last_msg) { + return; + } + InputMessageBase* to_run_msg = input_msg.release(); + if (!to_run_msg) { + return; + } + + if (ubring::FLAGS_ub_disable_bthread) { + ProcessInputMessage(to_run_msg); + return; + } + // Create bthread for last_msg. The bthread is not scheduled + // until bthread_flush() is called (in the worse case). + + // TODO(gejun): Join threads. + bthread_t th; + bthread_attr_t tmp = (FLAGS_usercode_in_pthread ? + BTHREAD_ATTR_PTHREAD : + BTHREAD_ATTR_NORMAL) | BTHREAD_NOSIGNAL; + tmp.keytable_pool = _socket->keytable_pool(); + tmp.tag = bthread_self_tag(); + bthread_attr_set_name(&tmp, "ProcessInputMessage"); + + if (!FLAGS_usercode_in_coroutine && bthread_start_background( + &th, &tmp, ProcessInputMessage, to_run_msg) == 0) { + ++*num_bthread_created; + } else { + ProcessInputMessage(to_run_msg); + } +} + +void UBShmTransport::Debug(std::ostream &os) {} + +int UBShmTransport::ContextInitOrDie(bool serverOrNot, const void* _options) { + if (serverOrNot) { + if (!OptionsAvailableOverUB(static_cast<const ServerOptions *>(_options))) { + return -1; + } + ubring::GlobalUBInitializeOrDie(); + if (!ubring::InitPollingModeWithTag(static_cast<const ServerOptions *>(_options)->bthread_tag)) { + return -1; + } + } else { + if (!OptionsAvailableForUB(static_cast<const ChannelOptions *>(_options))) { + return -1; + } + ubring::GlobalUBInitializeOrDie(); + if (!ubring::InitPollingModeWithTag(bthread_self_tag())) { Review Comment: Does ubring only support polling mode? -- This is an automated message from the Apache Git Service. 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