= nng_aio_finish(3)
//
// Copyright 2018 Staysail Systems, Inc. <info@staysail.tech>
// Copyright 2018 Capitar IT Group BV <info@capitar.com>
//
// This document is supplied under the terms of the MIT License, a
// copy of which should be located in the distribution where this
// file was obtained (LICENSE.txt).  A copy of the license may also be
// found online at https://opensource.org/licenses/MIT.
//

== NAME

nng_aio_finish - finish asynchronous I/O operation

== SYNOPSIS

[source, c]
----
#include <nng/nng.h>

void nng_aio_finish(nng_aio *aio, int err);
----

== DESCRIPTION

The `nng_aio_finish()` function marks operation associated with _aio_ as
complete, with the status _err_.
This will be the result returned by
xref:nng_aio_result.3.adoc[`nng_aio_result()`].

This function causes the callback associated with the _aio_ to called.

IMPORTANT: It is mandatory that operation "`providers`" call this function
*EXACTLY ONCE* when they are finished with the operation.
After calling this function they *MUST NOT* perform any further accesses
to the _aio_.

NOTE: This function is only for I/O providers (those actually performing
the operation such as HTTP handler functions or transport providers); ordinary
users of the _aio_ should not have any need for this function.

== RETURN VALUES

None.

== ERRORS

None.

== SEE ALSO

[.text-left]
xref:nng_aio_alloc.3.adoc[nng_aio_alloc(3)],
xref:nng_aio_begin.3.adoc[nng_aio_begin(3)],
xref:nng_aio_cancel.3.adoc[nng_aio_cancel(3)],
xref:nng_aio_defer.3.adoc[nng_aio_defer(3)],
xref:nng_aio_result.3.adoc[nng_aio_result(3)],
xref:nng_aio.5.adoc[nng_aio(5)],
xref:nng.7.adoc[nng(7)]