Add io_uring_cq_ready()

io_uring_cq_ready(), returns the number of completions that are ready.

test/cq-ready.c: tests io_uring_cq_ready

Signed-off-by: James Rouzier <rouzier@gmail.com>

2 files changed, 92 insertions, 2 deletions

diff --git a/test/Makefile b/test/Makefile
index 54052a7..65dbb8c 100644
--- a/test/Makefile
+++ b/test/Makefile
@@ -6,7 +6,7 @@ all_targets += poll poll-cancel ring-leak fsync io_uring_setup io_uring_register
 	       io_uring_enter nop sq-full cq-full 35fa71a030ca-test \
 		917257daa0fe-test b19062a56726-test eeed8b54e0df-test link \
 		send_recvmsg a4c0b3decb33-test 500f9fbadef8-test timeout \
-		sq-space_left stdout
+		sq-space_left stdout cq-ready
 
 include ../Makefile.quiet
 
@@ -19,7 +19,7 @@ test_srcs := poll.c poll-cancel.c ring-leak.c fsync.c io_uring_setup.c \
 	io_uring_register.c io_uring_enter.c nop.c sq-full.c cq-full.c \
 	35fa71a030ca-test.c 917257daa0fe-test.c b19062a56726-test.c \
 	eeed8b54e0df-test.c link.c send_recvmsg.c a4c0b3decb33-test.c \
-	500f9fbadef8-test.c timeout.c sq-space_left.c stdout.c
+	500f9fbadef8-test.c timeout.c sq-space_left.c stdout.c cq-ready.c
 
 test_objs := $(patsubst %.c,%.ol,$(test_srcs))
 
diff --git a/test/cq-ready.c b/test/cq-ready.c
new file mode 100644
index 0000000..1885c0c
--- /dev/null
+++ b/test/cq-ready.c
@@ -0,0 +1,90 @@
+/*
+ * Description: test CQ ready
+ *
+ */
+#include <errno.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <fcntl.h>
+
+#include "liburing.h"
+
+static int queue_n_nops(struct io_uring *ring, int n)
+{
+	struct io_uring_sqe *sqe;
+	int i, ret;
+
+	for (i = 0; i < n; i++) {
+		sqe = io_uring_get_sqe(ring);
+		if (!sqe) {
+			printf("get sqe failed\n");
+			goto err;
+		}
+
+		io_uring_prep_nop(sqe);
+	}
+
+	ret = io_uring_submit(ring);
+	if (ret < n) {
+		printf("Submitted only %d\n", ret);
+		goto err;
+	} else if (ret < 0) {
+		printf("sqe submit failed: %d\n", ret);
+		goto err;
+	}
+
+	return 0;
+err:
+	return 1;
+}
+
+#define CHECK_READY(ring, expected) do {\
+	ready = io_uring_cq_ready((ring));\
+	if (ready != expected) {\
+		printf("Got %d CQs ready, expected %d\n", ready, expected);\
+		goto err;\
+	}\
+} while(0)
+
+int main(int argc, char *argv[])
+{
+	struct io_uring ring;
+	int ret;
+	unsigned ready;
+
+	ret = io_uring_queue_init(4, &ring, 0);
+	if (ret) {
+		printf("ring setup failed\n");
+		return 1;
+
+	}
+
+	CHECK_READY(&ring, 0);
+	if (queue_n_nops(&ring, 4))
+		goto err;
+
+	CHECK_READY(&ring, 4);
+	io_uring_cq_advance(&ring, 4);
+	CHECK_READY(&ring, 0);
+	if (queue_n_nops(&ring, 4))
+		goto err;
+
+	CHECK_READY(&ring, 4);
+
+	io_uring_cq_advance(&ring, 1);
+	CHECK_READY(&ring, 3);
+
+	io_uring_cq_advance(&ring, 2);
+	CHECK_READY(&ring, 1);
+
+	io_uring_cq_advance(&ring, 1);
+	CHECK_READY(&ring, 0);
+
+	io_uring_queue_exit(&ring);
+	return 0;
+err:
+	io_uring_queue_exit(&ring);
+	return 1;
+}