void clock_routine() {
user_to_system(&(current()->st));
zeos_show_clock();
++zeos_ticks;
update_sched_data_rr();
if (needs_sched_rr()){
update_current_state_rr(&readyqueue);////////////modificar quan fem exit (ready or free)???
sched_next_rr();
}
system_to_user(&(current()->st));
}
void sys_exit()
{
/*
a) Free the data structures and resources of this process (physical memory, task_struct,
and so). It uses the free_frame function to free physical pages.
b) Use the scheduler interface to select a new process to be executed and make a context
switch.*/
update_user_to_system();
free_user_pages(current());
update_current_state_rr(&freequeue);
sched_next_rr();
}