初探Libev

1. libev++学习

libev是个高性能跨平台的事件驱动框架，支持io事件，超时事件，子进程状态改变通知，信号通知，文件状态改变通知，还能用来实现wait/notify机制。libev对每种监听事件都用一个ev_type类型的数据结构表示，如ev_io, ev_timer, ev_child, ev_async分别用来表示文件监听器, timeout监听器, 子进程状态监听器, 同步事件监听器.

ev_timer简单例子：

1. #include <ev++.h>
   #include <unistd.h>
   
   void SecondTimeout(EV_P_ ev_timer *w, int revents)
   {
       ;//秒回调函数
   }
   void MinuteTimeout(EV_P_ ev_timer *w, int revents)
   {
       ;//分钟回调函数
   }
   
   int main(int argc,const char *argv[])
   {
       ev::default_loop loop;
   
       ev_timer second_watcher;
       
       ev_timer_init(&second_watcher, SecondTimeout, 0., 1);
       ev_timer_start(loop, &second_watcher);
   	
       ev_timer minute_watcher;
       ev_timer_init(&minute_watcher, MinuteTimeout, 0., 60);
       ev_timer_start(loop, &minute_watcher);
   	
       loop.run(0);
       return 0;
   }