目录1 队列数据结构2 共享内存获取2.1 PublisherImpl::loan2.2PublisherImpl::loanSample2.3 PublisherPortUser::tryAllocateChunk2.4ChunkSender::tryAllocate3 消息发送逻辑3.1PublisherImpl::publish3.2PublisherPortUser::sendChunk3.3ChunkSender::send3.4ChunkDistri