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[Fun Fact] C++ Lambda表达式

参考博客
使用Lambda表达式创建线程

  //recipes/netcat.cc
  std::thread thr([&stream] () {
    char buf[8192];
    int nr = 0;
    while ( (nr = stream->receiveSome(buf, sizeof(buf))) > 0)
    {
      int nw = write_n(STDOUT_FILENO, buf, nr);
      if (nw < nr)
      {
        break;
      }
    }
    ::exit(0);  // should somehow notify main thread instead
  });

Trilogy of TCP client/server

  • SO_REUSEADDR
  • Ignore SIGPIPE
  • TCP_NODELAY
    TCP_NODELAY选项用以禁用Nagle算法,使得数据包不用延迟发送

Nagle算法的规则(可参考tcp_output.c文件里tcp_nagle_check函数注释):
(1)如果包长度达到MSS,则允许发送;
(2)如果该包含有FIN,则允许发送;
(3)设置了TCP_NODELAY选项,则允许发送;
(4)未设置TCP_CORK选项时,若所有发出去的小数据包(包长度小于MSS)均被确认,则允许发送;
(5)上述条件都未满足,但发生了超时(一般为200ms),则立即发送。

[Trick]: 使用RAII机制实现状态重置

//muduo/net/http/HttpComtext.cc
  void reset()
  {
    state_ = kExpectRequestLine;
    HttpRequest dummy;
    request_.swap(dummy);
  }

新建一个local对象,用以重置成员,当退出作用域时local对象会自动调用析构函数释放资源,快捷地实现了成员的重置。

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