Linux 定时器应用示例

1.运行结果

2.程序

#include <stdio.h>
#include <signal.h>
#include <sys/time.h>
int count=0;
struct itimerval t;
void timer_handler(int sig)
{
  printf("timer_handler:signal=%d,count=%d\n",sig,++count);
  
  if(count>=8)
    {
      printf("cancel timer\n");
      t.it_value.tv_sec=0;
      t.it_value.tv_usec=0;
      setitimer(ITIMER_VIRTUAL,&t,NULL);
         }
 
}
main()
{
  struct itimerval timer;
  signal(SIGVTALRM,timer_handler);
  timer.it_value.tv_sec=0;
  timer.it_value.tv_usec=100000;
  timer.it_value.tv_sec=1;
   timer.it_value.tv_usec=0;
  setitimer(ITIMER_VIRTUAL,&timer,NULL);
  printf("looping:enter Control-C to terminate\n");
  printf("Hello World!\r\n-----------------------------------");
  while(1)
    {
      ;
    }
}