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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | SEE ALSO | COLOPHON |
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io_uring_prep_futex_wake(3) liburing Manual io_uring_prep_futex_wake(3)
io_uring_prep_futex_wake - prepare a futex wake request
#include <linux/futex.h>
#include <unistd.h>
#include <liburing.h>
void io_uring_prep_futex_wake(struct io_uring_sqe *sqe,
uint32_t *futex,
uint64_t val,
uint64_t mask,
uint32_t futex_flags,
unsigned int flags);
The io_uring_prep_futex_wake(3) function prepares a futex wake
request. The submission queue entry sqe is setup for waking any
waiters on the futex indicated by futex and at most val futexes.
futex_flags indicates the futex2(2) modifier flags, and io_uring
futex flags of flags .
If a given bitset for who to wake is desired, then that must be
set in mask . Use FUTEX_BITSET_MATCH_ANY to match any waiter on
the given futex.
flags are currently unused and hence 0 must be passed.
This function prepares an async futex(2) wake request. See that
man page for details. Note that the io_uring futex wake request
is similar to the FUTEX_WAKE_BITSET operation, as FUTEX_WAKE is a
strict subset of that.
None
The CQE res field will contain the result of the operation. On
success, the value will be the index into futexv which received a
wakeup. See the related man page for details on possible values
for errors. 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.
io_uring_get_sqe(3), io_uring_submit(3),
io_uring_prep_futex_wait(3), io_uring_prep_futex_waitv(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 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
man-pages@man7.org
liburing-2.5 Sep 29, 2023 io_uring_prep_futex_wake(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 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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