## Macro: SB-THREAD::WITH-CAS-LOCK
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> Runs BODY with interrupts disabled and *CURRENT-THREAD* compare-and-swapped
> into PLACE instead of NIL. PLACE must be a place acceptable to
> COMPARE-AND-SWAP, and must initially hold NIL.
> 
> WITH-CAS-LOCK is suitable mostly when the critical section needing protection
> is very small, and cost of allocating a separate lock object would be
> prohibitive. While it is the most lightweight locking constructed offered by
> SBCL, it is also the least scalable if the section is heavily contested or
> long.
> 
> WITH-CAS-LOCK can be entered recursively.

### Lambda list
```cl
((sb-thread::place) &body sb-thread::body)
```