## Macro: SB-EXT:WAIT-FOR
[![package](https://img.shields.io/badge/Package-SB--EXT-5f9ea0.svg?style=social&colorA=999999)](../) [![type](https://img.shields.io/badge/Type-Macro-5f9ea0.svg?style=social&colorA=999999)](../#macro) 

> Wait until TEST-FORM evaluates to true, then return its primary value.
> If TIMEOUT is provided, waits at most approximately TIMEOUT seconds before
> returning NIL.
> 
> If WITH-DEADLINE has been used to provide a global deadline, signals a
> DEADLINE-TIMEOUT if TEST-FORM doesn't evaluate to true before the
> deadline.
> 
> Experimental: subject to change without prior notice.

### Lambda list
```cl
(sb-thread::test-form &key sb-thread::timeout)
```