---
name: "io_uring_prep_futex_waitv"
section: "3"
platform: "linux"
package: "liburing"
version: "2.15-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/io_uring_prep_futex_waitv"
---

# io\_uring\_prep\_futex\_waitv(3)

prepare a futex waitv request

## NAME

io\_uring\_prep\_futex\_waitv - prepare a futex waitv request

## SYNOPSIS

```
#include <linux/futex.h>
#include <unistd.h>
#include <liburing.h>
```

**void io\_uring\_prep\_futex\_waitv(struct io\_uring\_sqe \****sqe***,**                                **const struct futex\_waitv \****futexv***,**                                **uint32\_t** *nr\_futex***,**                                **unsigned int** *flags***);**

## DESCRIPTION

The [**io\_uring\_prep\_futex\_waitv**(3)](/io_uring_prep_futex_waitv/3.md) function prepares a futex wait request for multiple futexes at the same time. The submission queue entry *sqe* is setup for waiting on all futexes given by *futexv* and *nr\_futex* is the number of futexes in that array. *flags* must be set to the io\_uring specific futex flags.

Unlike [**io\_uring\_prep\_futex\_wait**(3)](/io_uring_prep_futex_wait/3.md), the desired bitset mask and values are passed in *futexv*.

*flags* are currently unused and hence **0** must be passed.

This function prepares an async [**futex**(2)](/futex/2.md) waitv request. See that man page for details.

Available since kernel 6.7.

## RETURN VALUE

None

## ERRORS

The CQE *res* field will contain the result of the operation. See the related man page for details on possible values. Note that where synchronous system calls will return **-1** on failure and set *errno* to the actual error value, io\_uring never uses *errno*. Instead it returns the negated *errno* directly in the CQE *res* field.

## NOTES

Unlike the sync futex syscalls that wait on a futex, io\_uring does not support passing in a timeout for the request. Instead, applications are encouraged to use a linked timeout to abort the futex request at a given time, if desired.

## SEE ALSO

[**io\_uring\_get\_sqe**(3)](/io_uring_get_sqe/3.md), [**io\_uring\_submit**(3)](/io_uring_submit/3.md), [**io\_uring\_prep\_futex\_wait**(3)](/io_uring_prep_futex_wait/3.md), [**io\_uring\_prep\_futex\_wake**(3)](/io_uring_prep_futex_wake/3.md), [**io\_uring\_prep\_link\_timeout**(3)](/io_uring_prep_link_timeout/3.md), [**futex**(2)](/futex/2.md) **futex2**(2)