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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | STANDARDS | HISTORY | SEE ALSO | COLOPHON |
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FUTEX_UNLOCK_PI(2const) FUTEX_UNLOCK_PI(2const)
FUTEX_UNLOCK_PI - unlock a priority‐inheritance futex
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_UNLOCK_PI);
This operation wakes the top priority waiter that is waiting in
FUTEX_LOCK_PI(2const) or FUTEX_LOCK_PI2(2const) on the futex
address provided by the uaddr argument.
This is called when the user-space value at uaddr cannot be
changed atomically from a TID (of the owner) to 0.
On error, -1 is returned, and errno is set to indicate the error.
On success, FUTEX_UNLOCK_PI returns 0 if the futex was
successfully unlocked.
See futex(2).
EINVAL The kernel detected an inconsistency between the user-space
state at uaddr and the kernel state. This indicates either
state corruption or that the kernel found a waiter on uaddr
which is waiting via FUTEX_WAIT(2const) or
FUTEX_WAIT_BITSET(2const).
ENOSYS A run-time check determined that the operation is not
available. The PI-futex operations are not implemented on
all architectures and are not supported on some CPU
variants.
EPERM The caller does not own the lock represented by the futex
word.
Linux.
Linux 2.6.18.
futex(2)
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user-space interface documentation) project. Information about
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Linux man-pages 6.15 2025-05-30 FUTEX_UNLOCK_PI(2const)
Pages that refer to this page: futex(2)
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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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