Repeat function with interval

I want a function to be executed in a while-loop with intervals of x seconds.

Here's what I've got:

Code:

---

while (1)
{
  if (loopcount == 0)
      {
        function();
        loopcount++;
      }

      if (loopcount == 1)
      {
          int milliseconds = 3000;
          long timeout = clock() + milliseconds;
          if(clock() < timeout)
          {
            // nothing
          }
          else
          {
              loopcount--;
          }
      }
}

---

No error, but it's not working! I tried a lot of things and I've read http://faq.cprogramming.com/cgi-bin/...&id=1043284392

Well considering you're reassigning the variables everytime you loop. You're basically trying to catch up with a time that's increasing as fast as you're getting to it.

Code:

---

int milliseconds = 3000;                // Outside of
long timeout = clock() + milliseconds;  // the loop

while(1) /*shudder*/ {

---