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# nng_aio_wait
## NAME
nng_aio_wait --- wait for asynchronous I/O operation
## SYNOPSIS
```c
#include <nng/nng.h>
void nng_aio_wait(nng_aio *aio);
```
## DESCRIPTION
The `nng_aio_wait()` function waits for an asynchronous I/O operation
to complete.
If the operation has not been started, or has already
completed, then it returns immediately.
If a callback was set with _aio_ when it was allocated, then this
function will not be called until the callback has completed.
> [!IMPORTANT]
> This function should never be called from a function that itself
> is a callback of an [`nng_aio`][aio], either this one or any other.
> Doing so may result in a deadlock.
## SEE ALSO
[nng_aio_abort][nng_aio_abort],
[nng_aio_busy][nng_aio_busy]
{{#include ../refs.md}}
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