implementation session manager

src/session/session_queue.cpp

@@ -0,0 +1,77 @@
+#include "session_queue.h"
+#include "session_private.h"
+
+struct session_queue
+{
+    struct session *head;
+    struct session *tail;
+    int count;
+};
+
+struct session_queue *session_queue_create()
+{
+    struct session_queue *queue = (struct session_queue *)calloc(1, sizeof(struct session_queue));
+    if (queue == NULL)
+    {
+        return NULL;
+    }
+    return queue;
+}
+
+void session_queue_destroy(struct session_queue *queue)
+{
+    if (queue)
+    {
+        free(queue);
+        queue = NULL;
+    }
+}
+
+void session_queue_push(struct session_queue *queue, struct session *sess)
+{
+    if (queue == NULL || sess == NULL)
+    {
+        return;
+    }
+
+    if (queue->head == NULL)
+    {
+        queue->head = sess;
+        queue->tail = sess;
+    }
+    else
+    {
+        queue->tail->next_ready_ptr = sess;
+        queue->tail = sess;
+    }
+    sess->next_ready_ptr = NULL;
+    queue->count++;
+}
+
+struct session *session_queue_pop(struct session_queue *queue)
+{
+    if (queue == NULL)
+    {
+        return NULL;
+    }
+
+    struct session *sess = queue->head;
+    if (sess == NULL)
+    {
+        return NULL;
+    }
+
+    if (queue->head == queue->tail)
+    {
+        queue->head = NULL;
+        queue->tail = NULL;
+    }
+    else
+    {
+        queue->head = sess->next_ready_ptr;
+    }
+    sess->next_ready_ptr = NULL;
+    queue->count--;
+
+    return sess;
+}