[#MaybeCheckNotHeld-07]
= MaybeCheckNotHeld
:mrdocs:

Require negative capability on a Mutex before locking it and pass it through.

== Synopsis

Declared in `<sync.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
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xref:Mutex.adoc[Mutex]&
MaybeCheckNotHeld(xref:Mutex.adoc[Mutex]& cs);
----

== Return Value

The same mutex reference.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *cs*
| Mutex about to be locked.
|===


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