static jack_nframes_t
dummy_driver_wait (dummy_driver_t *driver, int extra_fd, int *status,
float *delayed_usecs)
{
jack_nframes_t nframes = driver->period_size;
struct timespec now;
*status = 0;
/* this driver doesn't work so well if we report a delay */
*delayed_usecs = 0; /* lie about it */
clock_gettime(CLOCK_REALTIME, &now);
if (cmp_lt_ts(driver->next_wakeup, now)) {
if (driver->next_wakeup.tv_sec == 0) {
/* first time through */
clock_gettime(CLOCK_REALTIME, &driver->next_wakeup);
} else if ((ts_to_nsec(now) - ts_to_nsec(driver->next_wakeup))/1000LL
> (PRETEND_BUFFER_SIZE * 1000000LL
/ driver->sample_rate)) {
/* xrun */
jack_error("**** dummy: xrun of %ju usec",
(uintmax_t)(ts_to_nsec(now) - ts_to_nsec(driver->next_wakeup))/1000LL);
nframes = 0;
driver->next_wakeup.tv_sec = 0;
} else {
/* late, but handled by our "buffer"; try to
* get back on track */
}
driver->next_wakeup = add_ts(driver->next_wakeup, driver->wait_time);
} else {
if(clock_nanosleep(CLOCK_REALTIME, TIMER_ABSTIME, &driver->next_wakeup, NULL)) {
jack_error("error while sleeping");
*status = -1;
} else {
clock_gettime(CLOCK_REALTIME, &now);
// guaranteed to sleep long enough for this to be correct
*delayed_usecs = (ts_to_nsec(now) - ts_to_nsec(driver->next_wakeup));
*delayed_usecs /= 1000.0;
}
driver->next_wakeup = add_ts(driver->next_wakeup, driver->wait_time);
}
driver->last_wait_ust = driver->engine->get_microseconds ();
driver->engine->transport_cycle_start (driver->engine,
driver->last_wait_ust);
return nframes;
}
/* Check the task list for the cpu and check for schedule feasibility */
struct rt_info* create_feasible_schedule(int cpu_id)
{
struct rt_info *it, *best_dead, *head, *best_ivd, *last_ivd;
struct cpu_info *cur_cpu = NULL;
struct timespec exec_ts;
int removed;
cur_cpu = get_cpu_state(cpu_id);
head = cur_cpu->head;
best_dead = head;
if(!head)
goto out;
best_ivd = head;
it = task_list_entry(head->task_list[LIST_CPUTSK].next, LIST_CPUTSK);
do {
if(insert_on_list(it, best_ivd, LIST_CPUIVD, SORT_KEY_GVD, 0))
best_ivd = it;
it = task_list_entry(it->task_list[LIST_CPUTSK].next, LIST_CPUTSK);
} while(it != head);
last_ivd = task_list_entry(best_ivd->task_list[LIST_CPUIVD].prev, LIST_CPUIVD);
do {
removed = 0;
it = best_dead;
exec_ts = current_kernel_time();
do {
add_ts(&exec_ts, &(it->left), &exec_ts);
if(earlier_deadline(&(it->deadline), &exec_ts)) {
list_remove(last_ivd, LIST_CPUTSK);
if(last_ivd == best_dead) {
best_dead = task_list_entry(last_ivd->task_list[LIST_CPUTSK].next, LIST_CPUTSK);
}
last_ivd = task_list_entry(last_ivd->task_list[LIST_CPUIVD].prev, LIST_CPUIVD);
removed = 1;
}
it = task_list_entry(it->task_list[LIST_CPUTSK].next, LIST_CPUTSK);
} while(removed == 0 && it != best_dead);
} while(last_ivd != best_ivd && removed == 1);
out:
cur_cpu->best_dead = best_dead;
return best_dead;
}