[#BloombergLP-bslmt-Once-d_mutex]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslmt.adoc[bslmt]::xref:BloombergLP/bslmt/Once.adoc[Once]::d&lowbar;mutex
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:mrdocs:

Mutex used to synchronize one&hyphen;time execution&period; Public for static initialization, but do _not_ access directly&period;

== Synopsis

Declared in `&lt;bslmt&lowbar;once&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
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xref:BloombergLP/bslmt/QLock.adoc[QLock] d&lowbar;mutex;
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