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

Registers a hook for mutex contention profiling.

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
RegisterMutexProfiler(void(* fn)(int64_t));
----

== Description

Only a single profiler can be installed in a running binary.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *fn*
| Callback invoked with the number of wait cycles on contention.
|===


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