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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | NOTES | SEE ALSO | COLOPHON |
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io_uring_prep_futex_waitv(3) liburing Manualio_uring_prep_futex_waitv(3)
io_uring_prep_futex_waitv - prepare a futex waitv request
#include <linux/futex.h>
#include <unistd.h>
#include <liburing.h>
void io_uring_prep_futex_wait(struct io_uring_sqe *sqe,
struct futex_waitv *futexv,
uint32_t nr_futex,
unsigned int flags);
The io_uring_prep_futex_waitv(3) function prepares a futex wait
request for multiple futexes at the same time. The submission
queue entry sqe is setup for waiting on all futexes given by
futexv and nr_futex is the number of futexes in that array.
flags must be set to the io_uring specific futex flags.
Unlike io_uring_prep_futex(3), the desired bitset mask and values
are passed in futexv .
flags are currently unused and hence 0 must be passed.
This function prepares an async futex(2) waitv request. See that
man page for details.
None
The CQE res field will contain the result of the operation. See
the related man page for details on possible values. Note that
where synchronous system calls will return -1 on failure and set
errno to the actual error value, io_uring never uses errno.
Instead it returns the negated errno directly in the CQE res
field.
Unlike the sync futex syscalls that wait on a futex, io_uring
does not support passing in a timeout for the request. Instead,
applications are encouraged to use a linked timeout to abort the
futex request at a given time, if desired.
io_uring_get_sqe(3), io_uring_submit(3),
io_uring_prep_futex_wait(3), io_uring_prep_futex_wake(3),
io_uring_prep_link_timeout(3), futex(2) futex2(2)
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-2.5 Sep 29, 2023 io_uring_prep_futex_waitv(3)
Pages that refer to this page: io_uring_prep_futex_wait(3), io_uring_prep_futex_waitv(3), io_uring_prep_futex_wake(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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