[#BloombergLP-ball-CategoryManager-rulesetMutex]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/ball.adoc[ball]::xref:BloombergLP/ball/CategoryManager.adoc[CategoryManager]::rulesetMutex
:relfileprefix: ../../../
:mrdocs:

Return a non&hyphen;`const` reference to the mutex that is used to guard against concurrent access to the rule set&period; A lock on the returned mutex should be acquired before accessing the properties of the rule set returned by `ruleSet`&period; The behavior is undefined unless a lock is acquired solely for the purpose of calling `ruleSet`&period;

== Synopsis

Declared in `&lt;ball&lowbar;categorymanager&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
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xref:BloombergLP/bslmt/Mutex.adoc[bslmt::Mutex]&
rulesetMutex();
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