Added queue structure

include/queue.h

@@ -0,0 +1,53 @@
+#pragma once
+
+struct queue_node_t;
+
+/**
+ * @brief A last-in-first-out queue.
+ * 
+ */
+struct queue_t
+{
+    /**
+     * @brief The number of objects stored in this queue.
+     * 
+     */
+    unsigned int count;
+
+    /**
+     * @brief A link to the first node stored in this queue.
+     * 
+     */
+    struct queue_node_t *first;
+
+    /**
+     * @brief A link to the last node stored in this queue.
+     * 
+     */
+    struct queue_node_t *last;
+};
+
+/**
+ * @brief Inserts a new item at the end of the queue.
+ * 
+ * @param queue 
+ * @param ptr 
+ */
+void queue_insert(struct queue_t *queue, void *ptr);
+
+/**
+ * @brief Removes the next item from the queue and returns it.
+ * 
+ * @param queue 
+ * @return void* 
+ */
+void *queue_get_next(struct queue_t *queue);
+
+/**
+ * @brief Returns the next item on the queue without removing it.
+ * 
+ * @param queue 
+ * @return void* 
+ */
+void *queue_peek(struct queue_t *queue);
+