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# nng_sleep_aio
## NAME
nng_sleep_aio - sleep asynchronously
## SYNOPSIS
```c
#include <nng/nng.h>
void nng_sleep_aio(nng_duration msec, nng_aio *aio);
```
## DESCRIPTION
The `nng_sleep_aio()` function provides an asynchronous delay mechanism,
causing the callback for _aio_ to be executed after _msec_ milliseconds.
If the sleep finishes completely, the result will always be zero.
> [!NOTE]
> If a timeout is set on _aio_ using
> [`nng_aio_set_timeout()`](../aio/nng_aio_set_timeout.md), and it is shorter
> than _msec_,
> then the sleep will wake up early, with a result code of `NNG_ETIMEDOUT`.
## SEE ALSO
[nng_clock][nng_clock],
[nng_msleep][nng_msleep],
[Asynchronous I/O](../aio/index.md)
{{#include ../refs.md}}
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