I am learning C and implementing a function where a variable is incremented at a certain period of time. However, I have been unable to find a solution that isn’t dependent on operating system (pthreads) or ones that are for C++ or C#. Additionally, I am unable to find a way that doesn’t use a function like usleep(); because I need to have this running with the rest of the program, not stopping it.

This is the function that I’ve written so far, but as mentioned I haven’t been able to find a solution.

int increment = 0;

void var_increment(){
   // can't find a time based way
   increment += 1;
   

}