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

Registers a hook for `CondVar` tracing.

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
RegisterCondVarTracer(void(* fn)(char const*, void const*));
----

== Description

This is thread‐safe, but only a single tracer can be registered.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *fn*
| Callback invoked with an event name and an opaque `CondVar` handle.
|===


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