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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | SEE ALSO | COLOPHON |
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io_uring_wait_cqe_nr(3) liburing Manual io_uring_wait_cqe_nr(3)
io_uring_wait_cqe_nr - wait for one or more io_uring completion
events
#include <liburing.h>
int io_uring_wait_cqe_nr(struct io_uring *ring,
struct io_uring_cqe **cqe_ptr,
unsigned wait_nr);
The io_uring_wait_cqe_nr(3) function returns wait_nr IO
completion events from the queue belonging to the ring param,
waiting for it if necessary. If the requested number of events
are already available in the ring when invoked, no waiting will
occur. The cqe_ptr param is filled in on success.
After the caller has submitted a request with io_uring_submit(3),
the application can retrieve the completion with
io_uring_wait_cqe(3).
Ideally used with a ring setup with
IORING_SETUP_SINGLE_ISSUER|IORING_SETUP_DEFER_TASKRUN as that
will greatly reduce the number of context switches that an
application will see waiting on multiple requests.
On success io_uring_wait_cqe_nr(3) returns 0 and the cqe_ptr
param is filled in. On failure it returns -errno. The return
value indicates the result of waiting for a CQE, and it has no
relation to the CQE result itself.
io_uring_queue_init_params(3), io_uring_submit(3),
io_uring_wait_cqes(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 [email protected]. This page
was obtained from the project's upstream Git repository
⟨https://github.com/axboe/liburing⟩ on 2024-06-14. (At that
time, the date of the most recent commit that was found in the
repository was 2024-06-03.) 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
[email protected]
liburing-2.1 November 15, 2021 io_uring_wait_cqe_nr(3)
Pages that refer to this page: io_uring_wait_cqe_nr(3)
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HTML rendering created 2024-06-26 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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