/*
* Set task private pointer.
*/
void
task_set_private (task_t *t, void *new_private)
{
arch_state_t x;
arch_intr_disable (&x);
assert (STACK_GUARD (task_current));
t->privatep = new_private;
arch_intr_restore (x);
}
bool_t mutex_group_remove (mutex_group_t* g, mutex_t* m)
{
assert(UOS_MGROUP_SMART > 0);
gr_assert_good(g);
#if UOS_MGROUP_SMART > 0
// look 1st empty slot
mutex_slot_t *s;
arch_state_t x;
arch_intr_disable (&x);
for (s = g->slot + g->num; --s >= g->slot; ) {
if (s->lock == m) {
list_unlink (&s->item);
s->lock = 0;
arch_intr_restore (x);
return 1;
}
}
arch_intr_restore (x);
#endif
return 0;
}
bool_t
mutex_group_lockwaiting (mutex_t *m, mutex_group_t *g, mutex_t **lock_ptr, void **msg_ptr)
{
if (mutex_recurcived_lock(m))
return 1;
arch_state_t x;
struct mg_signal_ctx signaler = {g, lock_ptr, msg_ptr};
arch_intr_disable (&x);
assert_task_good_stack(task_current);
assert (task_current->wait == 0);
gr_assert_good(g);
assert (g->num > 0);
if (m != NULL)
if (! m->item.next)
mutex_init (m);
for (;;) {
if (m != NULL)
if (mutex_trylock_in(m)) {
arch_intr_restore (x);
return true;
}
if (mutex_group_signaled(&signaler)) {
arch_intr_restore (x);
return false;
}
if (m != NULL)
mutex_slaved_yield(m);
else {
/* Suspend the task. */
list_unlink (&task_current->item);
task_schedule ();
}
}
}
/*
* Stop listening on the group.
* Detach slots from the lock->groups linked lists.
* Use mutex_group_listen() to start listening.
* Beware, multiple calls to mutex_group_unlisten() will crash the system!
*/
void
mutex_group_unlisten (mutex_group_t *g)
{
arch_state_t x;
mutex_slot_t *s;
gr_assert_good(g);
arch_intr_disable (&x);
assert_task_good_stack(task_current);
for (s = g->slot + g->num; --s >= g->slot; ) {
assert (! list_is_empty (&s->item));
//s->message = 0;
list_unlink (&s->item);
}
arch_intr_restore (x);
}
/*
* Associate IRQ with the lock.
* On interrupt, the signal message is sent to the lock.
*/
void mutex_attach_swi (mutex_t *m, mutex_irq_t* swi, handler_t func, void *arg)
{
arch_state_t x;
arch_intr_disable (&x);
if (! m->item.next)
mutex_init (m);
m->irq = swi;
assert (m->irq->lock == 0);
m->irq->lock = m;
m->irq->handler = func;
m->irq->arg = arg;
m->irq->pending = 0;
arch_intr_restore (x);
}
/*
* Suspend the current task so that other tasks can run.
*/
void
task_yield ()
{
arch_state_t x;
arch_intr_disable (&x);
/* Enqueue always puts element at the tail of the list. */
list_append (&task_active, &task_current->item);
/* Scheduler selects the first task.
* If there are several tasks with equal priority,
* this will allow them to run round-robin. */
task_schedule ();
arch_intr_restore (x);
}
/** \~russian
* сбрасывает статус активности с мутехов группы, ожидание активности
* ведется с этого момента.
* подключает прослушивание не подключенных мутехов
*/
void mutex_group_relisten(mutex_group_t* g) {
arch_state_t x;
mutex_slot_t *s;
gr_assert_good(g);
arch_intr_disable (&x);
for (s = g->slot + g->num; --s >= g->slot; ) {
s->active = 0;
#if UOS_MGROUP_SMART > 0
if (s->lock != 0)
if (list_is_empty (&s->item)) {
s->message = 0;
list_prepend (&s->lock->groups, &s->item);
}
#endif
}
arch_intr_restore (x);
}
/*
* Start listening on all locks in the group.
* Attach slots to the lock->groups linked list of every lock.
* Use mutex_group_unlisten() to stop listening.
* Beware, multiple calls to mutex_group_listen() will crash the system!
*/
void
mutex_group_listen (mutex_group_t *g)
{
arch_state_t x;
mutex_slot_t *s;
gr_assert_good(g);
arch_intr_disable (&x);
assert_task_good_stack(task_current);
for (s = g->slot + g->num; --s >= g->slot; ) {
#if UOS_MGROUP_SMART > 0
if (s->lock == 0) continue;
#endif
assert (list_is_empty (&s->item));
s->message = 0;
s->active = 0;
list_prepend (&s->lock->groups, &s->item);
}
arch_intr_restore (x);
}
/*
* Wait for the signal on any lock in the group.
* The calling task is blocked until the mutex_signal().
* Returns the lock and the signalled message.
*/
void
mutex_group_wait (mutex_group_t *g, mutex_t **lock_ptr, void **msg_ptr)
{
arch_state_t x;
struct mg_signal_ctx signaler = {g, lock_ptr, msg_ptr};
arch_intr_disable (&x);
assert_task_good_stack(task_current);
assert (task_current->wait == 0);
gr_assert_good(g);
assert (g->num > 0);
for (;;) {
if (mutex_group_signaled(&signaler)) {
arch_intr_restore (x);
return;
}
/* Suspend the task. */
list_unlink (&task_current->item);
g->waiter = task_current;
task_schedule ();
}
}
