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io_uring_prep_futex_wake(3) — Linux manual page

io_uring_prep_futex_wake(3)  liburing Manualio_uring_prep_futex_wake(3)

NAME        top

       io_uring_prep_futex_wake - prepare a futex wake request

SYNOPSIS        top

#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_tval,uint64_tmask,uint32_tfutex_flags,unsigned intflags);

DESCRIPTION        top

       Theio_uring_prep_futex_wake(3) function prepares a futex wake       request. The submission queue entrysqe is setup for waking any       waiters on the futex indicated byfutex and at mostval futexes.futex_flags indicates thefutex2(2) modifier flags, and io_uring       futex flags offlags .       If a given bitset for who to wake is desired, then that must be       set inmask .  UseFUTEX_BITSET_MATCH_ANYto match any waiter on       the given futex.flags are currently unused and hence0must be passed.       This function prepares an asyncfutex(2) wake request. See that       man page for details. Note that the io_uring futex wake request is       similar to theFUTEX_WAKE_BITSEToperation, asFUTEX_WAKEis a       strict subset of that.       Available since kernel 6.7.

RETURN VALUE        top

       None

ERRORS        top

       The CQEres field will contain the result of the operation. On       success, the value will be the index intofutexv which received a       wakeup. See the related man page for details on possible values       for errors. Note that where synchronous system calls will return-1on failure and seterrno to the actual error value, io_uring       never useserrno.  Instead it returns the negatederrno directly       in the CQEres field.

SEE ALSO        top

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)

COLOPHON        top

       This page is part of theliburing (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 isnot part of the original manual page), send a mail to       man-pages@man7.orgliburing-2.5                   Sep 29, 2023io_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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