6 #include <linux/slab.h>
9 #include "util-queue.h"
11 void init_queue(struct gen_queue * queue, unsigned int max_entries) {
12 queue->num_entries = 0;
13 queue->max_entries = max_entries;
15 INIT_LIST_HEAD(&(queue->entries));
16 spin_lock_init(&(queue->lock));
19 struct gen_queue * create_queue(unsigned int max_entries) {
20 struct gen_queue * tmp_queue = palacios_alloc(sizeof(struct gen_queue));
22 ERROR("Unable to allocate a queue\n");
25 init_queue(tmp_queue, max_entries);
29 int enqueue(struct gen_queue * queue, void * entry) {
30 struct queue_entry * q_entry = NULL;
33 if (queue->num_entries >= queue->max_entries) {
37 q_entry = palacios_alloc(sizeof(struct queue_entry));
40 ERROR("Unable to allocate a queue entry on enqueue\n");
44 spin_lock_irqsave(&(queue->lock), flags);
46 q_entry->entry = entry;
47 list_add_tail(&(q_entry->node), &(queue->entries));
50 spin_unlock_irqrestore(&(queue->lock), flags);
56 void * dequeue(struct gen_queue * queue) {
60 spin_lock_irqsave(&(queue->lock), flags);
62 if (!list_empty(&(queue->entries))) {
63 struct list_head * q_entry = queue->entries.next;
64 struct queue_entry * tmp_entry = list_entry(q_entry, struct queue_entry, node);
66 entry_val = tmp_entry->entry;
68 palacios_free(tmp_entry);
74 spin_unlock_irqrestore(&(queue->lock), flags);