linux-datetime

timer

void timer_Handler(union sigval v)
{ 
	LOG_INFO<<"timer_Handler enter...";
}

int init_timer(timer_t *timerid, struct sigevent *evp, struct itimerspec *it)
{
    if ( !evp || !it )
        return -1;
 
    memset(evp, 0, sizeof(struct sigevent));   //清零初始化  
  
    evp->sigev_value.sival_int = 111;        //也是标识定时器的，这和timerid有什么区别？回调函数可以获得  
    evp->sigev_notify = SIGEV_THREAD;        //线程通知的方式，派驻新线程  
    evp->sigev_notify_function = timer_Handler;   //线程函数地址  
   // evp.sigev_value.sival_ptr = this; //这里传一个参数进去，在timer的callback回调函数里面可以获得它  
 
    if (timer_create(CLOCK_REALTIME, evp, timerid) == -1)  
    {  
        perror("fail to timer_create");  
        return -1;;  
    }  
 
    printf("timer_create timerid = %d\n", (int)*timerid);
    it->it_interval.tv_sec = 0;  // 后续按照该时间间隔 
    it->it_interval.tv_nsec =  14*1000000; //14ms   
	
    it->it_value.tv_sec = 0;     // 最初开始时间间隔 
    it->it_value.tv_nsec = 14*1000000; //14ms  
 
    return 0;
}
 
int start_timer(timer_t *timerid, struct itimerspec *it)
{
    if (it == NULL){
        return -1;
    }
    if (timer_settime(*timerid, 0, it, NULL) == -1)  
    {  
        perror("fail to timer_settime");  
        return -1;
    }  
    
    return 0;
}


timer_t timerid = 0;
struct sigevent evp;  
struct itimerspec it;  
//memset(&evp, 0x00, sizeof(struct sigevent));
//memset(&it, 0x00, sizeof(struct itimerspec));

int ret = init_timer(&timerid, &evp, &it);
if (ret < 0){
    printf("init_timer failed\n");
    
}
ret = start_timer(&timerid, &it);
if (ret < 0){
    printf("start_timer failed\n");
    
}else
{
    printf("start timer ok\n");
}