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---
date: 2022-01-07T08:00:00Z
title: Macro WITH-TIMEOUT
weight: 2
---
#### Syntax:
**with-timeout** (timeout) declaration\* forms\* => results
#### Arguments and values:
*timeout* -> a non-negative real number.\
*declaration* -> a declare expression; not evaluated.\
*forms* -> an implicit progn.\
*results* -> the values returned by the forms.
#### Description:
Execute `forms` and signal a condition of type
[**timeout**](../timeout) if the execution of `forms` does not
complete within `timeout` seconds.
#### Exceptional situations:
[**timeout**](../timeout), **not-implemented**
#### See also:
[**timeout**](../timeout)
#### Notes:
On implementations which do not support **with-timeout** natively and
don't support threads either it signals a condition of type
**not-implemented**.
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