开始研究libevent，使用的版本是2.0.22。 

 

实现一个定时器：每2秒执行一次printf。

#include 
     
      #include 
      
       #include 
       
        #include 
        
         #include 
         
          #include 
          
           int event_is_persistent;static void timeout_cb(int fd, short event, void *arg){ printf("run timeout_cb\n"); if (!event_is_persistent) { struct event *timeout = (struct event*)arg; struct timeval tv; tv.tv_sec = 2; tv.tv_usec = 0; event_add(timeout, &tv); }}int main(int argc, char **argv){ int flags; if (argc == 2 && !strcmp(argv[1], "-p")) { event_is_persistent = 1; flags = EV_PERSIST; } else { event_is_persistent = 0; flags = 0; } /* Initalize the event library */ struct event_base *base = event_base_new(); /* Initalize one event */ struct event timeout; event_assign(&timeout, base, -1, flags, timeout_cb, (void*) &timeout); struct timeval tv; tv.tv_sec = 2; tv.tv_usec = 0; event_add(&timeout, &tv); event_base_dispatch(base); return (0);}
          
         
        
       
      
     

 

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