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

Attempt to lock this reader‐writer mutex for reading. Immediately return 0 on success, and a non‐zero value if there are active or pending writers. If successful, `unlock` must be used to release the lock on this mutex. The behavior is undefined if this method is called from a thread that already has a lock on this mutex.

== Synopsis

Declared in `<bslmt_rwmutex.h>`

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


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