io/uring/Ring: add SubmitAndGetEvents()

src/io/uring/Queue.hxx

@@ -49,6 +49,10 @@ protected:
 	void AddPending(struct io_uring_sqe &sqe,
 			Operation &operation) noexcept;
 
+	void SubmitAndGetEvents() {
+		ring.SubmitAndGetEvents();
+	}
+
 public:
 	void Push(struct io_uring_sqe &sqe,
 		  Operation &operation) noexcept {

src/io/uring/Ring.cxx

@@ -22,6 +22,14 @@ Ring::Submit()
 		throw MakeErrno(-error, "io_uring_submit() failed");
 }
 
+void
+Ring::SubmitAndGetEvents()
+{
+	int error = io_uring_submit_and_get_events(&ring);
+	if (error < 0)
+		throw MakeErrno(-error, "io_uring_submit() failed");
+}
+
 struct io_uring_cqe *
 Ring::WaitCompletion()
 {

src/io/uring/Ring.hxx

@@ -53,9 +53,18 @@ public:
 	 * kernel using io_uring_submit().
 	 *
 	 * Throws on error.
+	 *
+	 * @see io_uring_submit()
 	 */
 	void Submit();
 
+	/**
+	 * Like Submit(), but also flush completions.
+	 *
+	 * @see io_uring_submit_and_get_events()
+	 */
+	void SubmitAndGetEvents();
+
 	/**
 	 * Waits for one completion.
 	 *