Implement simple websocket client

ringloop.h

@@ -118,9 +118,11 @@ struct ring_consumer_t
 
 class ring_loop_t
 {
+    std::vector<std::pair<int,std::function<void()>>> get_sqe_queue;
     std::vector<ring_consumer_t*> consumers;
     struct ring_data_t *ring_datas;
     int *free_ring_data;
+    int wait_sqe_id;
     unsigned free_ring_data_ptr;
     bool loop_again;
     struct io_uring ring;
@@ -139,6 +141,21 @@ public:
             io_uring_sqe_set_data(sqe, ring_datas + free_ring_data[--free_ring_data_ptr]);
         return sqe;
     }
+    inline int wait_sqe(std::function<void()> cb)
+    {
+        get_sqe_queue.push_back({ wait_sqe_id, cb });
+        return wait_sqe_id++;
+    }
+    inline void cancel_wait_sqe(int wait_id)
+    {
+        for (int i = 0; i < get_sqe_queue.size(); i++)
+        {
+            if (get_sqe_queue[i].first == wait_id)
+            {
+                get_sqe_queue.erase(get_sqe_queue.begin()+i, get_sqe_queue.begin()+i+1);
+            }
+        }
+    }
     inline int submit()
     {
         return io_uring_submit(&ring);