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

Lock the reader/writer lock for write. The call will block until all active read locks or active/pending write locks are released. When the reader/writer lock is locked for write, all read/write lock attempts will either fail or block until the lock is released. Use `unlock` to release the lock.

== Synopsis

Declared in `<bslmt_readerwriterlock.h>`

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


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