libev是高性能事件循环/事件模型的网络库,并且包含大量新特性,除了提供了基本的三大类事件（IO事件、定时器事件、信号事件）支持外还提供了周期事件、子进程事件、文件状态改变事件等多个事件的支持((Libev is a high performance event loop/event model of the network library, and contains a large number of new features, in addition to providing three kinds of basic events (IO events, timer events, signaling events) support also provides periodic events, process events, documents of state change event and many other events support ))