Io uring: Difference between revisions

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 uring does not generally make use of <tt>errno</tt>. Synchronous functions return the negative error code as their result. Completion queue entries have the negated error code placed in their <tt>res</tt> fields.
-CQEs are usually 16 bytes, and SQEs are usually 64 bytes (but see <tt>IORING_SETUP_SQE128</tt> and <tt>IORING_SETUP_CQE32</tt> below).
+CQEs are usually 16 bytes, and SQEs are usually 64 bytes (but see <tt>IORING_SETUP_SQE128</tt> and <tt>IORING_SETUP_CQE32</tt> below). Either way, SQEs are allocated externally to the submission queue, which is merely a ring of descriptors.
 ==Setup==