test_prog.c

#include <stdio.h>
#include <unistd.h>

int main(void)
{
    // Make sure program is not finished before pb scheduler takes control
    sleep(1);
    int b = 0;
    for (;b < 100; b++) {
      int a = 0;
      int c = 0;
      for (;a < 100000; a++){c = c + a;}
      // check if program runs
      printf("loop run: %d, c = %d \n", b, c);
      // syscall to switch tasks
      usleep(1);
    }
    return 0;
}