Fun with gettimeofday

[Yasir_Malik]

The tv_usec field in struct timeval is supposed to store the number of microseconds since January 1, 1970 00:00. But when I do the following:
#include <sys/time.h>

int main()
{
int i;
struct timeval start, end;
struct timezone tzp;

gettimeofday(&start, &tzp);

for(i = 0; i < 100000; i++){}

gettimeofday(&end, &tzp);

printf("start: %lu\n", start.tv_usec);
printf("end: %lu\n", end.tv_usec);
printf("time: %lu\n", end.tv_usec - start.tv_usec);

return 0;
}

The values I get for start.tv_usec and end.tv_usec are not increasing after every run of the program. For example, I'll get
start: 609659
end: 610257

and in another run afterwards I'll get
start: 204615
end: 205695

[Salem]

> The tv_usec field in struct timeval is supposed to store the number of microseconds since January 1, 1970 00:00
No, tv_sec stores this value

tv_usec is 0 to 999999

If tv_usec is 999999, adding 1 resets it back to 0, and increments tv_sec

[Yasir_Malik]

Thanks. You're a pro.

[newbie_grg]

Believe me dude Salem is the only REAL programmer we have in this forum... :)

[Lynux-Penguin]

I don't know I think Prelude, and Hammer classify as programmers too.

-LC

[KneeLess]

Originally posted by Lynux-Penguin
I don't know I think Prelude, and Hammer classify as programmers too.

-LC

But aren't we all? :p

[twm]

>But aren't we all? :p
I'm not. And proud of it too. :D Programmers are always running around mumbling about deadlines and looking worried. I run around making deadlines and looking goofy. That's the way to live life! :cool:

[Jaguar]

I agree with you all.
But where is vVv and where are his posts? :(