Time functions

[fallout01]

Is there any timing functions that will give me milliseconds.

gettimeofday() does microseconds,
and time() gives seconds at best precision

Anybody know of any that gives milliseconds?
Thanks

[Sebastiani]

clock()

[jim mcnamara]

clock has an issue. How fine-grained the result can be is left up to the compiler. In other words, you may get ms in 1000 or increments. You need to check tour results.

You are better off doing something like this with gettimeofday() to get to milliseconds:

#include <time.h>
int pointless(void)
{
    unsigned int i=0;
    while(i< 0xffffffe)
    {
    	 ++i;
    }
    printf("%d\n",i);
    return i;

}
int main()
{
          struct timeval  first,
                           second,
                           lapsed;

           struct timezone tzp;

              gettimeofday (&first, &tzp);

           /* lapsed time ...... */
           pointless();

           gettimeofday (&second, &tzp);

           if (first.tv_usec > second.tv_usec)
           {
              second.tv_usec += 1000000;
              second.tv_sec--;
           }
           lapsed.tv_usec = second.tv_usec - first.tv_usec;
           lapsed.tv_sec  = second.tv_sec  - first.tv_sec;
           printf("Millseconds=%d\n",lapsed.tv_sec*1000 + lapsed.tv_usec /1000);
           return 0;
}

[Kleid-0]

You probably could just make up a random number for milliseconds, it'll be close enough to real. lol

---EDIT---

#include <sys/time.h>
#include <stdlib.h>
#include <stdio.h>

int pointless(void) {
    unsigned int i=0;
    while(i < 0xffffffe) {
         ++i;
    }
    printf("%d\n", i);
    return i;
}

int main() {
 struct timeval first, second, lapsed;

	struct timezone tzp;
 gettimeofday (&first, &tzp);

 /* lapsed time ...... */
 pointless();

 gettimeofday (&second, &tzp);

 if (first.tv_usec > second.tv_usec)
 {
  second.tv_usec += 1000000;
  second.tv_sec--;
 }
 lapsed.tv_usec = second.tv_usec - first.tv_usec;
 lapsed.tv_sec  = second.tv_sec  - first.tv_sec;
 printf("Jim's Milliseconds = %d\n", lapsed.tv_sec*1000 + lapsed.tv_usec /1000);

 srand(time(NULL));
 printf("Kleid's Milliseconds = %d\n", rand() % 1500);
 return 0;
}

And as you may see, my approach is not error free:

kleid@Shiva:~/Programming/Laboratory$ ./a.out
268435454
Jim's Milliseconds = 513
Kleid's Milliseconds = 384
kleid@Shiva:~/Programming/Laboratory$ ./a.out
268435454
Jim's Milliseconds = 511
Kleid's Milliseconds = 1456
kleid@Shiva:~/Programming/Laboratory$ ./a.out
268435454
Jim's Milliseconds = 512
Kleid's Milliseconds = 1393
kleid@Shiva:~/Programming/Laboratory$ ./a.out
268435454
Jim's Milliseconds = 509
Kleid's Milliseconds = 1100
kleid@Shiva:~/Programming/Laboratory$