[#BloombergLP-bslmt-QLockGuard-lock-0a]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslmt.adoc[bslmt]::xref:BloombergLP/bslmt/QLockGuard.adoc[QLockGuard]::lock
:relfileprefix: ../../../
:mrdocs:

Acquire a lock on the associated `QLock`, blocking if necessary&period;

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
lock();
----

== Description

Acquire a lock on the associated `QLock` object&period; If the `lock` is not free, block until it can be acquired&period; The behavior is undefined if the calling thread already owns the lock on the QLock&period;


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