libev使用

1.安装:https://blog.csdn.net/Dancer__Sky/article/details/85156972

2.使动态链接库生效命令:/sbin/ldconfig -v

3.编译命令:gcc -o libevtest2 libevtest2.c -lev

4.测试程序

1. root@SHPD18F-SP05:~# cat libevtest2.c
   
   #include <stdio.h>
   #include <stdint.h>
   #include <unistd.h>
   #include <string.h>
   #include <time.h>
   #include <ev.h>
    
   #define TIMER_TEST
   //#define EV_IO_TEST
    
   /*获取系统本地时间打印*/
   uint32_t print_timenow()
   {
     time_t now;
     struct tm *tm_now;
     time(&now);
     tm_now = localtime(&now);
     uint32_t times = tm_now->tm_hour * 3600 + tm_now->tm_min * 60 + tm_now->tm_sec;
     printf("[%02d:%02d:%02d]\r\n", tm_now->tm_hour, tm_now->tm_min, tm_now->tm_sec);
     return times;
   }
    
    
   #ifdef TIMER_TEST
   /*定时器事件测试*/
   ev_timer timer_watcher;
    
   static void timer_cb (EV_P_ ev_timer *w, int revents)
   {
     printf("timer clock....");
     print_timenow();
     //ev_timer_stop(EV_A_ w);
     //ev_break(EV_A_ EVBREAK_ONE);
   }
    
   int main()
   {
     /*多线程不安全*/
     struct ev_loop *loop = EV_DEFAULT;
     ev_timer_init (&timer_watcher, timer_cb, 3, 1);
     ev_timer_start (loop, &timer_watcher);
     ev_run (loop, 0);
     return 0;
   }
   #endif
    
    
   #ifdef EV_IO_TEST
    
   ev_io stdin_watcher;
    
   static void stdin_cb (struct ev_loop *loop ,struct ev_io *w, int revents)
   {
     void *user_data = ev_userdata(loop);
     int num = *((int *)user_data);
     printf("stdin input......userdata = %d\r\n", num);
     ev_io_stop (loop, w);
     // this causes all nested ev_run's to stop iterating
     ev_break (EV_A_ EVBREAK_ALL);
   }
    
   int main()
   {
     /*创建一个事件循环，多线程安全*/
     struct ev_loop *loop = ev_loop_new(EVBACKEND_EPOLL);
     if (NULL == loop) {
       printf("create loop failed\r\n");
       return 1;
     }
     //传输用户数据
     int user_data = 666;
     ev_set_userdata(loop, &user_data);
     //初始化并开始
     ev_io_init (&stdin_watcher, stdin_cb, STDIN_FILENO, EV_READ);
     ev_io_start (loop, &stdin_watcher);
     //循环检测事件发生处理
     ev_run (loop, 0);
     return 0;
   }
   #endif