c ++选择异步编程 [英] c++ select async programming

问题描述

有一种方法可以选择等待读取和写入，同时还能够添加新的文件描述符？

Is there a way to have 'select' waiting for reads and writes, while also being able to add new file descriptors? Preferrably on one thread?

推荐答案

现在我知道你的场景是什么（一个基于套接字的服务器，可能想接受新的传入连接），你知道你可以附加你的侦听套接字的文件描述符到 select 的列表中？参见例如 http://www.lowtek.com/sockets/select.html 。

Now that I know what your scenario is (a socket-based server that may want to accept new incoming connections), did you know that you can append the file-descriptor for your listening socket to the list for select? See e.g. http://www.lowtek.com/sockets/select.html.

（注释例子）

fd_set socks;

FD_ZERO(&socks);

// Add listener socket
listen(sock, n);
FD_SET(&socks, sock);

// Add existing socket connections
for (i = 0; i < num_existing_connections; i++)
{
    FD_SET(&socks, connection[i]);
}

// Will break if any of the existing connections are active,
// or if a new connection appears.
select(..., &socks, ...);

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