#include <time.h>
int delay(int time)
{
int i,j;
for(i =0;i<time;i++)
for(j=0;j<10000;j++)
;
}
int main()
{
struct timespec start_1, end_1;
unsigned long long diff;
clock_gettime(CLOCK_REALTIME, &start_1);
delay(10); // UUT unit under test
clock_gettime(CLOCK_REALTIME, &end_1);
diff = 1000000000 * (end_1.tv_sec - start_1.tv_sec) + (end_1.tv_nsec - start_1.tv_nsec);
printf("the difference is %lld nano seconds
",diff);
return 0;
}
reference : too much