/* Unblock the first thread waiting on c, if extant */
void condition_signal(condition_t * c)
{
enter_critical();
ASSERT(disable_count);
unblock_one( &c->wait_queue );
leave_critical();
}
static void lock_release_helper(lock_t * l){
ASSERT(disable_count);
if (!unblock_one(&l->wait_queue)) {
l->status = UNLOCKED;
}
l->held_task = NULL;
}
/* TODO: Unblock the first thread waiting on c, if it exists */
void condition_signal(condition_t * c){
// disable int
enter_critical();
// wake up
unblock_one(&c->blocked);
// enable int
leave_critical();
}
/* Increment the semaphore value atomically */
void semaphore_up(semaphore_t * s)
{
enter_critical();
if(s->value < 1 && !queue_empty(&s->wait_queue))
unblock_one(&s->wait_queue);
else
s->value++;
leave_critical();
}
static void lock_release_helper(lock_t * l)
{
ASSERT(disable_count);
pcb_t *p = unblock_one(&l->wait_queue);
if( p )
{
p->waiting_for_lock = NULL;
l->owner = p;
}
else
{
l->owner = NULL;
}
l->status = UNLOCKED;
}
static void unblock_all(node_t * wait_queue){
while (is_empty(wait_queue)==0){
unblock_one(wait_queue);
}
}
/* TODO: Increment the semaphore value atomically */
void semaphore_up(semaphore_t * s){
enter_critical();
if(s->val++ == 0)
unblock_one(&s->wait_queue);
leave_critical();
}
/* TODO: Increment the semaphore value atomically */
void semaphore_up(semaphore_t * s){
enter_critical();
if (!unblock_one(&s->wait_queue))
++s->value;
leave_critical();
}
/* TODO: Unblock the first thread waiting on c, if it exists */
void condition_signal(condition_t * c){
enter_critical();
unblock_one(&c->wait_queue);
leave_critical();
}
static void unblock_all(node_t * wait_queue)
{
while( unblock_one(wait_queue) )
{}
}
