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

Attempt to lock this reader/writer lock for read. Return 0 on success, and a non‐zero value if the lock is currently locked for write or if there are writers waiting for this lock. If successful, `unlock` must be used to release this lock.

== Synopsis

Declared in `<bslmt_readerwriterlock.h>`

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


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