可以处理多个客户端的单一TCP/IP服务器(在C ++中)? [英] Single TCP/IP server that handles multiple clients (in C++)?

问题描述

我想用C ++(使用bind()，accept()等)编写一个TCP/IP服务器，该服务器可以处理多个同时连接到它的客户端. 我已经阅读了一些与此相关的主题，每个人都在提出以下建议(出现肮脏的伪代码):

I want to write a TCP/IP server in C++ (using bind(), accept() etc.) that can deal with multiple clients connecting to it at the same time. I have read a few topics about this, and everyone is suggesting the following (dirty pseudocode coming up):

set up server, bind it

while (1) {
    accept connection
    launch new thread to handle it
}

这在具有多个线程的计算机上完全可以正常工作.但是我的目标系统是没有任何硬件线程的单核计算机.为了进行一些测试，我尝试通过系统上的std::thread启动多个线程，但是它们是一个接一个地执行的.没有平行善良:(

Which would work totally fine on a machine that has multiple threads. But my target system is a single core machine without any hardware threads. For a little test, I tried launching multiple threads via std::thread on the system but they were executed one after the other. No parallel goodness :(

这使得无法实现上述算法.我的意思是，我确定可以做到，我只是不知道该怎么做，因此，我将非常感谢您的帮助.

That makes it impossible to implement the algorithm above. I mean, I'm sure it can be done, I just don't know how, so I would really appreciate any help.

推荐答案

您不需要线程，需要异步或事件驱动"编程.如果要跨平台，可以使用select()来完成；如果要使用Linux，并且要一次支持数千个客户端，则可以使用epoll()来完成.

You don't need threads, you need asynchronous or "event-driven" programming. This can be done with select() if you want cross-platform, or epoll() if you're on Linux and want to support thousands of clients at once.

但是您不需要从头开始实现所有操作-您可以使用提升ASIO (其中某些可能会成为C ++ 17的一部分)或类似 libevent 或 libev 或

But you don't need to implement this all from scratch--you can use Boost ASIO (some of which may become part of C++17) or a C library like libevent or libev or libuv. Those will handle a bunch of subtle details for you, and help you get more quickly to the real business of your application.

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