在不怎么了解libevent的情况下，看到timer这个关键字想到可以用来做定时任务，官方资料也不齐全，就从代码里看到了TIMEOUT字样，这么说来应该是支持timeout了，那interval呢，貌似没有发现更好的办法，姑且在timeout里再timeout一次吧，留代码备用。

1 #include 
     
       2 #include 
      
        3 #include 
       
         4  5 typedef struct { 6         struct timeval tv; 7         struct event * ev; 8 } timer_param_t; 9 10 11 void timer_task(int fd, short events, void * ctx) {12         printf("...\n");13 14         timer_param_t * param = (timer_param_t *) ctx;15         evtimer_add(param->ev, &param->tv);16 }17 18 int main() {19         struct event_base * base;20         base = event_base_new();21         if(!base) {22                 printf("open event base error\n");23                 return -1;24         }25         timer_param_t * param = calloc(1, sizeof(timer_param_t));26         param->ev = evtimer_new(base, timer_task, param);27         param->tv.tv_sec = 1;28         evtimer_add(param->ev, &param->tv);29         int err = event_base_dispatch(base);30         printf("error = %d\n", err);31         return 0;32 }
       
      
     

 编译：gcc -o timer timer.c -levent