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## 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 xref:nng_aio.adoc[`aio`], either this one or any other.
Doing so may result in a deadlock.
### See ALso
xref:nng_aio_abort.adoc[nng_aio_abort],
xref:nng_aio_busy.adoc[nng_aio_busy]
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