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

Lock this reader/writer lock for read. If there are no pending or active write locks, the call will return immediately, otherwise it block until all write locks have been released. Use `unlock` to release the lock.

== Synopsis

Declared in `<bslmt_readerwriterlock.h>`

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


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