c_nanomsg_demo is nn_global_init should call first before all thread's begin ? nanomsg is use SP ("Scalable Protocols") protocols. here is a implementation of pure Go https://github.com/go-mangos/mangos https://fugangqiang.github.io/blog/posts/web/%E6%B6%88%E6%81%AF%E9%98%9F%E5%88%97nanomsg%E4%B9%8B%E4%BB%8B%E7%BB%8D.html 一个 reqrep 模式 nanomsg/nanomsg#832