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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | SEE ALSO | COLOPHON |
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io_uring_re...er_reg_wait(3) liburing Manual io_uring_re...er_reg_wait(3)
io_uring_register_reg_wait - Registers fixed wait regions
#include <liburing.h>
int io_uring_register_reg_wait(struct io_uring *ring,
struct io_uring_reg_wait *reg,
int nr);
The io_uring_register_reg_wait(3) registers a fixed wait region
starting at reg and of nentries entries with the ring indicated by
ring.
This function works like io_uring_setup_reg_wait(3), except it
doesn't allocate any memory on behalf of the application. The
application must pass in previously allocated memory in reg, which
must be of the right size to hold nr entries and suitably aligned
on a page boundary.
The memory registered should not be freed until the ring for which
it is registered is closed.
Once a wait region has been setup, it persists for the life time
of the ring. It's currently not possible to unregister or resize
a wait region. Additionally, a wait region may currently only use
a single page of memory. On a 4k page size system, this means an
application is limited to 64 wait regions. That should be enough,
as each wait index may be modified as needed. With at least 64
indices available, hopefully applications can just use the
appropriately setup wait region for each specific type of wait,
with different indices having different wait settings.
Available since kernel 6.13.
On success io_uring_register_reg_wait(3) returns 0 . On failure,
it returns a -errno value.
io_uring_submit_and_wait_reg(3), io_uring_setup_reg_wait(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 2025-08-11. (At that time,
the date of the most recent commit that was found in the
repository was 2025-08-02.) 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-2.9 November 2, 2024io_uring_re...er_reg_wait(3)
Pages that refer to this page: io_uring_register_reg_wait(3)
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HTML rendering created 2025-09-06 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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