TrinityCore由生成两个运行文件authserver和world server以及一堆DLL（或so）文件的子项目组成（先忽略map_extractor等几个工具项目）。

authserver是登录验证服，它主要提供登录验证和获取服务器（区服）列表的功能。world server是真正的游戏服务器，提供游戏里的一切功能。相对而言，auth server比較简单，那我就从它入手啊，先看一下它的main函数，在源代码的基础上，我加上了凝视。

//该函数在src\server\authserver\Main.cpp中
int main(int argc, char** argv)
{  std::string configFile = _TRINITY_REALM_CONFIG;  //读取程序的參数，存入variables_map中  //假设參数中含有help，则输出信息，中止程序  auto vm = GetConsoleArguments(argc, argv, configFile);  // exit if help is enabled  if (vm.count("help"))  return 0;  //读取配置文件  std::string configError;  if (!sConfigMgr->LoadInitial(configFile, configError))  {  printf("Error in config file: %s\n", configError.c_str());  return 1;  }  //向控制台输出一配置信息  TC_LOG_INFO("server.authserver", "%s (authserver)", _FULLVERSION);  TC_LOG_INFO("server.authserver", "<Ctrl-C> to stop.\n");  TC_LOG_INFO("server.authserver", "Using configuration file %s.", configFile.c_str());  TC_LOG_INFO("server.authserver", "Using SSL version: %s (library: %s)", OPENSSL_VERSION_TEXT, SSLeay_version(SSLEAY_VERSION));  TC_LOG_INFO("server.authserver", "Using Boost version: %i.%i.%i", BOOST_VERSION / 100000, BOOST_VERSION / 100 % 1000, BOOST_VERSION % 100);  // authserver PID file creation  //创建一个文件，向当中写入PID  std::string pidFile = sConfigMgr->GetStringDefault("PidFile", "");  if (!pidFile.empty())  {  if (uint32 pid = CreatePIDFile(pidFile))  TC_LOG_INFO("server.authserver", "Daemon PID: %u\n", pid);  else  {  TC_LOG_ERROR("server.authserver", "Cannot create PID file %s.\n", pidFile.c_str());  return 1;  }  }  // Initialize the database connection  //初始化程序的数据库连接  if (!StartDB())  return 1;  // Get the list of realms for the server  //初始化world server列表  //也就是在auth数据库运行："SELECT id, name, address, localAddress, localSubnetMask, port, icon,   //flag, timezone, allowedSecurityLevel, population, gamebuild FROM realmlist WHERE flag <> 3 ORDER BY name"  //并将结果存入单例类RealmList的m_realms中  sRealmList->Initialize(_ioService, sConfigMgr->GetIntDefault("RealmsStateUpdateDelay", 20));  if (sRealmList->size() == 0)  {  TC_LOG_ERROR("server.authserver", "No valid realms specified.");  StopDB();  return 1;  }  // Start the listening port (acceptor) for auth connections  //从配置文件里读取监听的IP和端口  int32 port = sConfigMgr->GetIntDefault("RealmServerPort", 3724);  if (port < 0 || port > 0xFFFF)  {  TC_LOG_ERROR("server.authserver", "Specified port out of allowed range (1-65535)");  StopDB();  return 1;  }  std::string bindIp = sConfigMgr->GetStringDefault("BindIP", "0.0.0.0");  //初始化auth server  AsyncAcceptor<AuthSession> authServer(_ioService, bindIp, port);  // Set signal handlers  //绑定SIGINT（退出）信号的处理函数  boost::asio::signal_set signals(_ioService, SIGINT, SIGTERM);
#if PLATFORM == PLATFORM_WINDOWS  signals.add(SIGBREAK);
#endif  signals.async_wait(SignalHandler);  // Set process priority according to configuration settings  //设置进程（线程）的优先级  SetProcessPriority("server.authserver");  // Enabled a timed callback for handling the database keep alive ping  //添加一个定时器，用于与数据库保持心跳连接  _dbPingInterval = sConfigMgr->GetIntDefault("MaxPingTime", 30);  _dbPingTimer.expires_from_now(boost::posix_time::minutes(_dbPingInterval));  _dbPingTimer.async_wait(KeepDatabaseAliveHandler);  // Start the io service worker loop  //開始事件循环  _ioService.run();  // Close the Database Pool and library  //关闭数据库  StopDB();  TC_LOG_INFO("server.authserver", "Halting process...");  return 0;
}