Libevent 是一个用C语言编写的、轻量级的开源高性能事件通知库，主要有以下几个亮点：事件驱动（ event-driven），高性能;轻量级，专注于网络，不如 ACE 那么臃肿庞大；源代码相当精炼、易读；跨平台，支持 Windows、 Linux、 *BSD 和 Mac Os；支持多种 I/O 多路复用技术， epoll、 poll、 dev/poll、 select 和 kqueue 等；支持 I/O，定时器和信号等事件；注册事件优先级。(Libevent is an open source of high performance events in a language with C, lightweight circular base, mainly has the following highlights: event driven (event-driven), lightweight, high performance; focus on the network, as well as ACE so bloated; source code, very refined and legible; cross platform, support Windows, Linux, *BSD and Mac Os; support multiple I/O multiplexing technology, epoll, poll, dev/poll, select and kqueue; I/O, timer and signal events; registration priority.)