FUTEX_REQUEUE2const
Wake some waiters, and requeue others
Usage
#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);
Library
Standard C library (libc, -lc)
Overview
This operation performs the same task as FUTEX_CMP_REQUEUE(2const), except that the futex word isn't compared.
Return value
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.
Errors
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.