[#BloombergLP-bslmt-ReadLockGuard-2constructor-088]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslmt.adoc[bslmt]::xref:BloombergLP/bslmt/ReadLockGuard.adoc[ReadLockGuard]::ReadLockGuard
:relfileprefix: ../../../
:mrdocs:

Create a guard that acquires a read lock on `lock`.

== Synopsis

Declared in `<bslmt_readlockguard.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
explicit
ReadLockGuard(T* lock);
----

== Description

Create a scoped guard that conditionally manages the specified `lock` (if non‐null) and invokes `lock‐>lockRead()`. Supplying a null `lock` has no effect. The behavior is undefined unless `lock` (if non‐null) is not already locked by this thread. Note that `lock` must remain valid throughout the lifetime of this guard, or until `release` is called.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *lock*
| lock object to acquire for reading; may be null
|===


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