How to execute Time Loop in C without clock() and timer ?

I want to execute 2 different output at a certain time in seconds. And change the swap time using keyEvent. Here's the idea.

Attachment 15505

I've been looking for some advice online and I only find those with timer and clock(). I don't need to use timer and clock() since I already use a utilTimer library to count milliseconds as the program is executed.
Here's the my keyEvent code :

Code:

---

    if (key == '1' ) {
        mod=10;
    }


    if (key == '2' ) {
        mod=5;
    }
   
    if (key == '3' ) {
        mod=3;
    }
   
    if (key == '4' ) {
        mod=1;
    }

---

How do I implement the time loop ? As of now for the looping I'm using mod, but still a little bit confused and haven't achieved my goal.

Code:

---

for (int count = 0; true; count++) {
    if (count % 10 == 0) {
        //every 10 seconds
    }
    if (count % 5 == 0) {
        // Every 5 seconds
    }
}

---

Any advice ?

What is this 'utilTimer' you're talking about?

Can it be used to call a function when a timer expires?

Without knowing what utilTimer is, we're reduced to guessing; but it seems clear that you need to actually use utilTimer, instead of just counting by ones via count++ (since the probability that your loop takes exactly one millisecond is ... slim). How you use utilTimer depends on what it is; if it gives you an absolute time, you'll be subtracting a starting value to find time elapsed; if it gives you time since the previous call you'll be adding to a total; if it does something else, well, then you'll do something else.

Quote:

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Originally Posted by tabstop

Without knowing what utilTimer is, we're reduced to guessing; but it seems clear that you need to actually use utilTimer, instead of just counting by ones via count++ (since the probability that your loop takes exactly one millisecond is ... slim). How you use utilTimer depends on what it is; if it gives you an absolute time, you'll be subtracting a starting value to find time elapsed; if it gives you time since the previous call you'll be adding to a total; if it does something else, well, then you'll do something else.

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Thanks ! Right now I'm doing exactly that. Subtracting elapsed time with the time when I hit the key and compute if it bigger or less than my frequency that I defined in my keyEvent.