void
mainloop(void)
{
extern int game_is_being_shut_down;
struct task *current_task;
struct timeval tv;
double task_start;
#ifdef SUPER_SNOOP
read_snoop_file();
#endif
(void) printf("Setting up ipc.\n");
(void)fflush(stdout);
prepare_ipc();
(void) signal(SIGFPE, sigfpe_handler);
while (!game_is_being_shut_down) {
while (task_head.next == &task_head) {
set_current_time();
deliver_signals();
call_out(&tv);
if (task_head.next != &task_head)
tv.tv_sec = tv.tv_usec = 0;
nd_select(&tv);
check_for_slow_shut_down();
}
set_current_time();
current_task = task_head.next;
remove_task(current_task);
runtask(current_task);
task_start = current_time;
set_current_time();
update_runq_av((num_tasks + 1.0) * (current_time - task_start));
/* process callouts and IO */
deliver_signals();
if (task_head.next != &task_head ||
current_task->next == current_task) {
tv.tv_sec = tv.tv_usec = 0;
call_out(NULL);
} else
call_out(&tv);
if (task_head.next != &task_head ||
current_task->next == current_task)
tv.tv_sec = tv.tv_usec = 0;
nd_select(&tv);
check_for_slow_shut_down();
if (current_task->next == current_task)
append_task(current_task); /* reschedule the task */
else
free(current_task);
}
shutdowngame();
}
struct task *
create_task(void (*f)(void *), void *arg)
{
struct task *new_task;
new_task = xalloc(sizeof(struct task));
new_task->fkn = f;
new_task->arg = arg;
append_task(new_task);
return new_task;
}
void
reschedule_task(struct task *t)
{
if (!t)
return;
if (t->next == t)
return; /* It's the currently running task, it will be rescheduled
when it is finnished */
if (t->next == 0) {
t->prev = t->next = t; /* it's the currrently running task. Mark it
for rescheduling */
return;
}
/* Move the task to the tail */
remove_task(t);
append_task(t);
}
void scheduler_append(volatile TaskDescriptor *td) {
ASSERT(td->state == READY, "Can only append ready tasks");
append_task(td);
}