[#absl-Mutex-WriterLockWhen]
= xref:absl.adoc[absl]::xref:absl/Mutex.adoc[Mutex]::WriterLockWhen
:relfileprefix: ../../
:mrdocs:

Blocks until `cond` is `true` and the `Mutex` can be acquired, then atomically acquires it in write (exclusive) mode.

== Synopsis

Declared in `<absl/synchronization/mutex.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
WriterLockWhen(xref:absl/Condition.adoc[Condition] const& cond);
----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *cond*
| The condition to wait for.
|===


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