linux 间隔时间中断测试

该程序可以设置等待某段时间后发生中断，然后再按照要求在固定的时间又触发中断

 

/* *
* alarm2.c 带间隔时间中断测试
*/

#include < stdio.h >
#include < sys / time.h >
#include < signal.h >
#define  TIME  500
#define  VTIME 10    // star time
#define  ITIME 1000    // interval time
#define  MSG   "----ring----"
#define  COUNTS 5
void  ring();
void  set_ring_time( int , int );
int  main( int  ac, char   * av[])
{
signal(SIGALRM,ring);
set_ring_time(VTIME,ITIME);
while ( 1 )
        pause();   // 等待中断到达
return   0 ;
}
void  ring()
{
static   int  counts = COUNTS;
printf( "  %s\n " ,MSG);
if ( -- counts <= 0 )
        exit( 1 );
}
void  set_ring_time( int  vtime, int  itime)
{
struct  itimerval it_time;
long  v_sec = vtime / 1000 ;
long  v_usec = vtime % 1000 ;
long  i_sec = itime / 1000 ;
long  i_usec = itime % 1000 ;

it_time.it_interval.tv_sec = i_sec;
it_time.it_interval.tv_usec = i_usec;
it_time.it_value.tv_sec = v_sec;
it_time.it_value.tv_usec = v_usec;
setitimer(ITIMER_REAL, & it_time,NULL);
}