linux应用定时器的使用

最常用的就是setitimerr和alarm()两个
这里我们说第一个
struct itimerval
{
struct timeval it_interval; /* next value /
struct timeval it_value; / current value /
};
struct timeval
{
long tv_sec; / seconds /
long tv_usec; / microseconds */
};
介绍一下，首先初始化这两个结构体，lit_value表示系统运行多长时间后执行中断。 it_interval表示多少间隔执行中断。

#include <stdio.h>#include <unistd.h>#include <signal.h>#include <sys/time.h>#include <string.h>void test(){printf(\"time interrupt\\r\\n\");}int main(int argc,char *argv[]){int i=0;struct itimerval time_bit;memset(&time_bit,0,sizeof(time_bit));//表示系统运行3s后开始执行定时器中断，且中断间隔为2s.time_bit.it_value.tv_sec=3;time_bit.it_value.tv_usec=0;time_bit.it_interval.tv_sec=2;time_bit.it_interval.tv_usec=0;signal(SIGALRM,test);setitimer(ITIMER_REAL,&time_bit,NULL);while(i++<10){printf(\"time is %d\\r\\n\",i);sleep(1);}}

运行结果如下

time is 1time is 2time is 3time interrupttime is 4time is 5time interrupttime is 6time is 7time interrupttime is 8time is 9time interrupttime is 10root@VM-0-3-ubuntu:/home/ubuntu/fuxi#