= nng_aio_set_timeout(3)
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//
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// Copyright 2018 Staysail Systems, Inc. <info@staysail.tech>
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// Copyright 2018 Capitar IT Group BV <info@capitar.com>
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//
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// This document is supplied under the terms of the MIT License, a
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// copy of which should be located in the distribution where this
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// file was obtained (LICENSE.txt). A copy of the license may also be
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// found online at https://opensource.org/licenses/MIT.
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//
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== NAME
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nng_aio_set_timeout - set asynchronous I/O timeout
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== SYNOPSIS
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[source, c]
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----
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#include <nng/nng.h>
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typedef int nng_duration;
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void nng_aio_set_timeout(nng_aio *aio, nng_duration timeout);
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----
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== DESCRIPTION
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The `nng_aio_set_timeout()` function sets a _timeout_(((timeout)))
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for the asynchronous operation associated with _aio_.
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This causes a timer to be started when the operation is actually started.
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If the timer expires before the operation is completed, then it is
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aborted with an error of `NNG_ETIMEDOUT`.
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The _timeout_ is specified as a relative number of milliseconds.
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If the timeout is `NNG_DURATION_INFINITE`, then no timeout is used.
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If the timeout is `NNG_DURATION_DEFAULT`, then a "default" or socket-specific
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timeout is used.
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(This is frequently the same as `NNG_DURATION_INFINITE`.)
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TIP: As most operations involve some context switching, it is usually a good
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idea to allow at least a few tens of milliseconds before timing them out --
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a too small timeout might not allow the operation to properly begin before
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giving up!
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The value of _timeout_ set for the _aio_ is persistent, so that if the
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handle is reused for multiple operations, they will have the same relative
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timeout.
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== RETURN VALUES
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None.
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== ERRORS
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None.
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== SEE ALSO
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[.text-left]
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xref:nng_aio_alloc.3.adoc[nng_aio_alloc(3)],
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xref:nng_aio_cancel.3.adoc[nng_aio_cancel(3)],
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xref:nng_aio_result.3.adoc[nng_aio_result(3)],
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xref:nng_aio.5.adoc[nng_aio(5)],
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xref:nng_duration.5.adoc[nng_duration(5)],
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xref:nng.7.adoc[nng(7)]
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