#include <unistd.h>
#include <stdio.h>
void fast() {
int i;
for (i = 0; i < 2000; i++)
printf("Doing some fast work %d\n", i);
}
void slow() {
printf("Doing some slow non-CPU-bound work\n");
sleep(3);
}
int main() {
fast();
slow();
fast();
return 0;
}