Add ring_loop

ringloop.h

@@ -0,0 +1,40 @@
+#pragma once
+
+#ifndef _LARGEFILE64_SOURCE
+#define _LARGEFILE64_SOURCE
+#endif
+
+#include <liburing.h>
+#include <string.h>
+
+#include <functional>
+#include <vector>
+
+struct ring_data_t
+{
+    uint64_t source;
+    struct iovec iov; // for single-entry read/write operations
+    int res;
+    void *op;
+};
+
+struct ring_consumer_t
+{
+    int number;
+    std::function<void (ring_data_t*)> handle_event;
+    std::function<void ()> loop;
+};
+
+class ring_loop_t
+{
+    std::vector<ring_consumer_t> consumers;
+    struct ring_data_t *ring_data;
+public:
+    struct io_uring *ring;
+    ring_loop_t(int qd);
+    ~ring_loop_t();
+    struct io_uring_sqe* get_sqe();
+    int register_consumer(ring_consumer_t & consumer);
+    void unregister_consumer(int number);
+    void loop(bool sleep);
+};