//Runs all the commands in the queue
void wait_queue() {
//printf("wait_queue\n");
//implement some type of blocking mechanism that runs all commands
while (MKQ->running != NULL && MKQ->q != NULL) {
qcommand_t *last = MKQ->running;
while (last->next)
last = last->next;
waitpid(last->pid, NULL, 0);
kick_queue();
}
}
//Adds a command to the queue
int add_command(qcommand_t *to_q) {
if (to_q == NULL || MKQ == NULL) // return if either are null
return 1;
if (MKQ->q == NULL) {// if the q is null
to_q->next = NULL;
MKQ->q = to_q; // make to_q the head
} else { //else
qcommand_t *itr; //add it to the end of the q
for (itr = MKQ->q; itr != NULL; itr = itr->next)
if (itr->next == NULL)
itr->next= to_q;
}
kick_queue();
return 0;
}
int
virtio_to_queue(struct virtio_device *dev, int qidx, struct vumap_phys *bufs,
size_t num, void *data)
{
u16_t free_first;
int left;
struct virtio_queue *q = &dev->queues[qidx];
struct vring *vring = &q->vring;
assert(0 <= qidx && qidx <= dev->num_queues);
if (!data)
panic("%s: NULL data received queue %d", dev->name, qidx);
free_first = q->free_head;
left = (int)q->free_num - (int)num;
if (left < dev->threads)
set_indirect_descriptors(dev, q, bufs, num);
else
set_direct_descriptors(q, bufs, num);
/* Next index for host is old free_head */
vring->avail->ring[vring->avail->idx % q->num] = free_first;
/* Provided by the caller to identify this slot */
q->data[free_first] = data;
/* Make sure the host sees the new descriptors */
__insn_barrier();
/* advance last idx */
vring->avail->idx += 1;
/* Make sure the host sees the avail->idx */
__insn_barrier();
/* kick it! */
kick_queue(dev, qidx);
return 0;
}
