Allow the application to easily view if the CQ ring is in overflow state in
case it would like to explicitly flush using io_uring_get_events.
Explicit flushing can be useful for applications that prefer to have
reduced latency on CQs than to process as many as possible.
Signed-off-by: Dylan Yudaken <dylany@xxxxxx>
---
src/include/liburing.h | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/src/include/liburing.h b/src/include/liburing.h
index 3c5097b255de..ca8fbd608901 100644
--- a/src/include/liburing.h
+++ b/src/include/liburing.h
@@ -1086,6 +1086,15 @@ static inline unsigned io_uring_cq_ready(const struct io_uring *ring)
return io_uring_smp_load_acquire(ring->cq.ktail) - *ring->cq.khead;
}
+/*
+ * Returns true if there are overflow entries waiting to be flushed onto
+ * the CQ ring
+ */
+static inline bool io_uring_cq_has_overflow(const struct io_uring *ring)
+{
+ return IO_URING_READ_ONCE(*ring->sq.kflags) & IORING_SQ_CQ_OVERFLOW;
+}
+
/*
* Returns true if the eventfd notification is currently enabled
*/
--
2.30.2
