[I] brpc退出时卡死 (brpc)

[via GitHub]

zhangyachen opened a new issue, #2665:
URL: https://github.com/apache/brpc/issues/2665

   **Describe the bug (描述bug)**
   在程序退出时，brpc卡在Join的函数不继续执行。
   
   **To Reproduce (复现方法)**
   程序退出时会调用该方法：
   ```
   TRITONSERVER_Error*
   BRPCServer::Stop()
   {
     if (!running_) {
       return TRITONSERVER_ErrorNew(
           TRITONSERVER_ERROR_UNAVAILABLE, "BRPC server is not running.");
     }
   
     // @TODO 检查brpc server如何shutdown
     std::cout << "ready to stop brpc server" << std::endl;
     brpc_server_->Stop(0);
     std::cout << "ready to join brpc server" << std::endl;
     brpc_server_->Join();
     std::cout << "stop brpc server" << std::endl;
   
     running_ = false;
   
     return nullptr;  // success
   }
   ```
   
   加了三个debug日志，发现卡死在Join上了。
   
   场景是上游有**多个client创建多个链接**到brpc server。**我发现当没有流量到brpc 
server时，就可以正常退出**，打印stop brpc server，但是当上游还有流量到brpc server，我kill brpc 
server进程时，就会出现卡死现象。
   
   
   **Expected behavior (期望行为)**
   正常退出。
   
   **Versions (各种版本)**
   OS: Ubuntu 20.04.5 LTS (Focal Fossa)
   Compiler:  
   brpc:   master代码
   protobuf:  3.16
   
   **Additional context/screenshots (更多上下文/截图)**
   
   


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