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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | SEE ALSO | COLOPHON |
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io_uring_bu..._cq_advance(3) liburing Manualio_uring_bu..._cq_advance(3)
io_uring_buf_ring_cq_advance - advance index of provided buffer
and CQ ring
#include <liburing.h>
void io_uring_buf_ring_cq_advance(struct io_uring *ring,
struct io_uring_buf_ring *br,
int count);
void __io_uring_buf_ring_cq_advance(struct io_uring *ring,
struct io_uring_buf_ring *br,
int cq_count,
int buf_count);
The io_uring_buf_ring_cq_advance(3) commits count previously
added buffers to the shared buffer ring br, making them visible
to the kernel and hence consumable. This passes ownership of the
buffer to the ring. At the same time, it advances the CQ ring of
ring by count amount. This effectively bundles both a
io_uring_buf_ring_advance(3) call and a io_uring_cq_advance(3)
into one operation. Since updating either ring index entails a
store memory barrier, doing both at once is more efficient.
The __io_uring_buf_ring_cq_advance(3) function performs the same
operation, except it splits the counts into two separate values.
It advances the CQ ring by cq_count entries, and the buffer ring
by buf_count entries rather than increment both by the same
value.
None
io_uring_register_buf_ring(3), io_uring_buf_ring_add(3),
io_uring_buf_ring_advance(3)
This page is part of the liburing (A library for io_uring)
project. Information about the project can be found at
⟨https://github.com/axboe/liburing⟩. If you have a bug report for
this manual page, send it to io-uring@vger.kernel.org. This page
was obtained from the project's upstream Git repository
⟨https://github.com/axboe/liburing⟩ on 2023-12-22. (At that
time, the date of the most recent commit that was found in the
repository was 2023-12-19.) If you discover any rendering
problems in this HTML version of the page, or you believe there
is a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
man-pages@man7.org
liburing-2.2 May 18, 2022 io_uring_bu..._cq_advance(3)
Pages that refer to this page: io_uring_buf_ring_add(3), io_uring_buf_ring_advance(3), io_uring_buf_ring_cq_advance(3), __io_uring_buf_ring_cq_advance(3), io_uring_buf_ring_init(3), io_uring_for_each_cqe(3), io_uring_register_buf_ring(3), io_uring_setup_buf_ring(3)
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HTML rendering created 2023-12-22 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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