Release 1.0

[palacios.git] / geekos / src / geekos / queue.c

diff --git a/geekos/src/geekos/queue.c b/geekos/src/geekos/queue.c
new file mode 100644 (file)
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--- /dev/null
+++ b/geekos/src/geekos/queue.c
@@ -0,0 +1,58 @@
+/*
+ * This file is part of the Palacios Virtual Machine Monitor developed
+ * by the V3VEE Project with funding from the United States National 
+ * Science Foundation and the Department of Energy.  
+ *
+ * The V3VEE Project is a joint project between Northwestern University
+ * and the University of New Mexico.  You can find out more at 
+ * http://www.v3vee.org
+ *
+ * Copyright (c) 2008, Jack Lange <jarusl@cs.northwestern.edu> 
+ * Copyright (c) 2008, The V3VEE Project <http://www.v3vee.org> 
+ * All rights reserved.
+ *
+ * Author: Jack Lange <jarusl@cs.northwestern.edu>
+ *
+ * This is free software.  You are permitted to use,
+ * redistribute, and modify it as specified in the file "V3VEE_LICENSE".
+ */
+
+#include <geekos/queue.h>
+
+
+
+void init_queue(struct gen_queue * queue) {
+  queue->num_entries = 0;
+  INIT_LIST_HEAD(&(queue->entries));
+}
+
+
+struct gen_queue * create_queue() {
+  struct gen_queue * tmp_queue = Malloc(sizeof(struct gen_queue));
+  init_queue(tmp_queue);
+  return tmp_queue;
+}
+
+void enqueue(struct gen_queue * queue, void * entry) {
+  struct queue_entry * q_entry = Malloc(sizeof(struct queue_entry));
+
+  q_entry->entry = entry;
+  list_add_tail(&(q_entry->entry_list), &(queue->entries));
+  queue->num_entries++;
+}
+
+
+void * dequeue(struct gen_queue * queue) {
+  void * entry_val = 0;
+  
+  if (!list_empty(&(queue->entries))) {
+    struct list_head * q_entry = queue->entries.next;
+    struct queue_entry * tmp_entry = list_entry(q_entry, struct queue_entry, entry_list);
+
+    entry_val = tmp_entry->entry;
+    list_del(q_entry);
+    Free(tmp_entry);
+  }
+
+  return entry_val;
+}