IO模型与非阻塞IO与libevent
The article explains IO models—from blocking IO’s limitations to non‑blocking and multiplexing techniques like select, poll, and epoll—then shows how libevent encapsulates these mechanisms to provide a Reactor‑style event‑driven framework, illustrated with a simple echo server implementation.
IO模型介绍，包括阻塞IO、非阻塞IO、IO多路复用（select、poll、epoll）和libevent的使用。
分析了阻塞IO的缺点，如进程被阻塞导致无法处理多个客户端，进而引入了非阻塞IO和IO多路复用解决方案。
使用libevent封装了多路复用调用，支持select、poll、epoll等，并实现了事件驱动的Reactor模式，简化了IO处理逻辑。
代码示例展示了使用libevent实现回显服务器，包括EventBase和Event类的使用。
总结了IO模型的发展历程，从阻塞IO到非阻塞IO再到IO多路复用，最终到libevent的封装。
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