Call function periodically without using threads and sleep() method in c

Question

I want to call a function, lets say every 10 or 20 seconds. When I searched, I came up with threads and sleep() method everywhere.

I also checked for time

Answer 1

Try this:

while(true) {
   if(System.getNanotime % 20 == 0) {
      myFunction();
   } 
}

This is in Java-Syntax, i didn't program c since more than 5 years, but maybe it helps you :)