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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | STANDARDS | HISTORY | SEE ALSO | COLOPHON |
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FUTEX_REQUEUE(2const) FUTEX_REQUEUE(2const)
FUTEX_REQUEUE - wake some waiters, and requeue others
Standard C library (libc, -lc)
#include <linux/futex.h> /* Definition of FUTEX_* constants */
#include <sys/syscall.h> /* Definition of SYS_* constants */
#include <unistd.h>
long syscall(SYS_futex, uint32_t *uaddr, FUTEX_REQUEUE,
uint32_t val, uint32_t val2, uint32_t *uaddr2);
This operation performs the same task as
FUTEX_CMP_REQUEUE(2const), except that the futex word isn't
compared.
On error, -1 is returned, and errno is set to indicate the error.
On success, FUTEX_REQUEUE returns the number of waiters that were
woken up.
See futex(2).
EFAULT uaddr2 did not point to a valid user-space address.
EINVAL uaddr2 does not point to a valid object—that is, the
address is not four-byte-aligned.
EINVAL The kernel detected an inconsistency between the user-space
state at uaddr and the kernel state—that is, it detected a
waiter which waits in FUTEX_LOCK_PI(2const) or
FUTEX_LOCK_PI2(2const) on uaddr.
Linux.
Linux 2.6.0.
futex(2)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
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⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
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Linux man-pages 6.15 2025-05-30 FUTEX_REQUEUE(2const)
Pages that refer to this page: futex(2), FUTEX_CMP_REQUEUE(2const)
Copyright and license for this manual page
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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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