io_uring_cq_has_overflow(3) — Linux manual page


io_uring_cq_has_overflow(3)  liburing Manual io_uring_cq_has_overflow(3)

NAME         top

       io_uring_cq_has_overflow - returns if there are overflow entries
       waiting to move to the CQ ring

SYNOPSIS         top

       #include <liburing.h>

       bool io_uring_cq_has_overflow(const struct io_uring *ring);

DESCRIPTION         top

       The io_uring_cq_has_overflow(3) function informs the application
       if CQ entries have overflowed and are waiting to be flushed to
       the CQ ring. For example using io_uring_get_events(3)

NOTES         top

       Using this function is only valid if the ring has
       IORING_FEAT_NODROP set, as it's checking for a flag set by
       kernels supporting that feature. For really old kernels that
       don't support this feature, if CQE overflow is experienced the
       CQEs are lost. If that happens, the CQ ring overflow offset will
       get incremented.

RETURN VALUE         top

       True if there are CQ entries waiting to be flushed to the CQ

SEE ALSO         top


COLOPHON         top

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liburing-2.3                September 5, 2022io_uring_cq_has_overflow(3)

Pages that refer to this page: io_uring_cq_has_overflow(3)io_uring_get_events(3)