#include "TcpServer.h"
 #include "EventLoop.h"
 #include "InetAddress.h"
 #include <stdio.h>
 
 std::string message1;
 std::string message2;
 
 void onConnection(const muduo::TcpConnectionPtr& conn)
 {
   if (conn->connected())
   {
!    printf("onConnection(): tid=%d new connection [%s] from %s\n",
+           muduo::CurrentThread::tid(),
            conn->name().c_str(),
            conn->peerAddress().toHostPort().c_str());
+    if (!message1.empty())
       conn->send(message1);
+    if (!message2.empty())
       conn->send(message2);
     conn->shutdown();
   }
   else
   {
!    printf("onConnection(): tid=%d connection [%s] is down\n",
+           muduo::CurrentThread::tid(),
            conn->name().c_str());
   }
 }
 
 void onMessage(const muduo::TcpConnectionPtr& conn,
                muduo::Buffer* buf,
                muduo::Timestamp receiveTime)
 {
!  printf("onMessage(): tid=%d received %zd bytes from connection [%s] at %s\n",
+         muduo::CurrentThread::tid(),
          buf->readableBytes(),
          conn->name().c_str(),
          receiveTime.toFormattedString().c_str());
 
   buf->retrieveAll();
 }
 
 int main(int argc, char* argv[])
 {
   printf("main(): pid = %d\n", getpid());
 
   int len1 = 100;
   int len2 = 200;
 
   if (argc > 2)
   {
     len1 = atoi(argv[1]);
     len2 = atoi(argv[2]);
   }
 
   message1.resize(len1);
   message2.resize(len2);
   std::fill(message1.begin(), message1.end(), 'A');
   std::fill(message2.begin(), message2.end(), 'B');
 
   muduo::InetAddress listenAddr(9981);
   muduo::EventLoop loop;
 
   muduo::TcpServer server(&loop, listenAddr);
   server.setConnectionCallback(onConnection);
   server.setMessageCallback(onMessage);
+  if (argc > 3) {
+    server.setThreadNum(atoi(argv[3]));
+  }
   server.start();
 
   loop.loop();
 }