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)
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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)
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