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## 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.
### Errors
[horizontal]
`NNG_ETIMEDOUT`:: The sleep was interrupted by a timeout.footnote:[This seemingly paradoxical situation happens if the _aio_ has a timeout set with xref:nng_aio_set_timeout.adoc[`nng_aio_set_timeout`] that is shorter than _msec_.]
`NNG_ECANCELED`:: The operation was canceled.
### See Also
xref:nng_aio_abort.adoc[nng_aio_abort],
xref:nng_aio_set_timeout.adoc[nng_aio_set_timeout]
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