linux下多定时器源码

最新推荐文章于 2021-05-03 21:36:23 发布

cindylx422

最新推荐文章于 2021-05-03 21:36:23 发布

阅读量1.1k

点赞数

分类专栏： linux笔记文章标签： linux timer thread signal struct function

本文链接：https://blog.youkuaiyun.com/cindylx422/article/details/7077729

版权

linux笔记专栏收录该内容

8 篇文章

订阅专栏

该博客详细介绍了在Linux环境下如何创建和设置多个定时器，并使用SIGEV_THREAD方式进行信号通知。通过示例代码展示了如何定义处理函数，分别处理不同定时器触发的信号，以及如何设置定时器间隔和初始值。定时器的创建使用了`timer_create`，而时间设定则依赖于`timer_settime`。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

#include <time.h>
#include <signal.h>
#include<stdio.h>
#include<stdlib.h>
#include <unistd.h>
#include <string.h>
void handle(union sigval v)
{
   time_t t;
   char p[32];

   time(&t);
   strftime(p, sizeof(p), "%T", localtime(&t));

   printf("%s thread %lu, val = %d, signal captured.\n", p, pthread_self(), v.sival_int);
   return;
}

void handlec(union sigval v) //定时器2产生信号时调用的处理函数
{
   time_t t;
   char p[32];

   time(&t);
   strftime(p, sizeof(p), "%T", localtime(&t));

   printf("%s thread %lu, val = %d, signal captured.\n", p, pthread_self(), v.sival_int);
   return;
}

int main()
{
   struct sigevent evp,evc;
   struct itimerspec ts,tsc;
   timer_t timer,timerc;
   int ret,retc;
/*----------------------定时器2---------------------------------------*/
memset (&evc, 0, sizeof (evc));
evc.sigev_value.sival_ptr = &timerc;
evc.sigev_notify = SIGEV_THREAD;
evc.sigev_notify_function = handlec;
evc.sigev_value.sival_int = 2; //作为handle()的参数

retc = timer_create(CLOCK_REALTIME, &evc, &timerc);
if( retc)
   perror("timerc_create");

tsc.it_interval.tv_sec = 5;
tsc.it_interval.tv_nsec = 0;
tsc.it_value.tv_sec = 3;
tsc.it_value.tv_nsec = 0;

retc = timer_settime(timerc, TIMER_ABSTIME, &tsc, NULL);
if( retc )
   perror("timerc_settime");
/*---------------------定时器4-------------------------------------*/

   memset (&evp, 0, sizeof (evp));
   evp.sigev_value.sival_ptr = &timer;
   evp.sigev_notify = SIGEV_THREAD;
   evp.sigev_notify_function = handle;
   evp.sigev_value.sival_int = 4; //作为handle()的参数

   ret = timer_create(CLOCK_REALTIME, &evp, &timer);
   if( ret)
       perror("timer_create");

   ts.it_interval.tv_sec = 1;
   ts.it_interval.tv_nsec = 0;
   ts.it_value.tv_sec = 3;
   ts.it_value.tv_nsec = 0;

   ret = timer_settime(timer, TIMER_ABSTIME, &ts, NULL);
   if( ret )
       perror("timer_settime");

   while(1);
}