io_uring: add IORING_CQ_EVENTFD_DISABLED to the CQ ring flags

This new flag should be set/clear from the application to disable/enable eventfd notifications when a request is completed and queued to the CQ ring. Before this patch, notifications were always sent if an eventfd is registered, so IORING_CQ_EVENTFD_DISABLED is not set during the initialization. It will be up to the application to set the flag after initialization if no notifications are required at the beginning.

Stefano Garzarella committed 6 years ago

Commit 7e55a191 parent 0d9b5b32 files · +9 −0Browse files

Showing the changes to include/uapi (1 of 2 files). Show all

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include/uapi/linux/io_uring.h+7−0

@@ -209,6 +209,13 @@ struct io_cqring_offsets { · 208 unmodified lines
209	209	__u64 resv2;
210	210	};
211	211
	212	+/*
	213	+ * cq_ring->flags
	214	+ */
	215	+
	216	+/* disable eventfd notifications */
	217	+#define IORING_CQ_EVENTFD_DISABLED (1U << 0)
	218	+
212	219	/*
213	220	* io_uring_enter(2) flags
214	221	*/