[#BloombergLP-bslmt-Once-d_mutex]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslmt.adoc[bslmt]::xref:BloombergLP/bslmt/Once.adoc[Once]::d_mutex
:relfileprefix: ../../../
:mrdocs:

Mutex used to synchronize one‐time execution. Public for static initialization, but do _not_ access directly.

== Synopsis

Declared in `<bslmt_once.h>`

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