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

Small, statically‐initializable mutex for serialized resource access.

== Synopsis

Declared in `<bslmt_qlock.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
struct QLock;
----

== Description

An efficient statically‐initializable synchronization primitive that enables serialized access to shared resources. Objects of this class can only be manipulated through the use of a `QLockGuard`. The following idiom is used to initialize objects of type `QLock`: ` QLock mylock = BSLMT_QLOCK_INITIALIZER; `

== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bslmt/QLock/initialize.adoc[`initialize`] 
| Set this lock into the initial unlocked state.
| xref:BloombergLP/bslmt/QLock/isLocked.adoc[`isLocked`] 
| Return `true` if this lock is locked, and `false` otherwise.
|===


== Data Members

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bslmt/QLock/d_guardQueueTail.adoc[`d_guardQueueTail`] 
| Pointer to the last guard in the queue of guards waiting for this lock, or 0 if the lock is unlocked.
|===



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