Thread: Scheduled program

I've been using something somewhat like this to keep track of time for a program, and it works fine... except that it seems to eat up all the computer's resources. Does anyone know how to have a program stay on a schedule while running in the background without sucking up all the computer's power?

Code:

  
  while(!compareTime(timeH, timeM));
  cout << "End of job.";

bool compareTime(int timeH, int timeM)
{
    int timeH_now;
    int timeM_now;
    ofstream currentOut("current.txt");
    time_of_day now;
  
    now.get_time_string();
    currentOut << now.hour << " " << now.minute;
    currentOut.close();
  
    ifstream currentIn("current.txt");
    currentIn >> timeH_now >> timeM_now;
    currentIn.close();
  
    if(timeH_now == timeH && timeM_now == timeM)
       return true;
    else
       return false;
}

Thank you!