# null_mutex Class

## Summary

Class that models Mutex Concept buts does nothing.

## Syntax

    class null_mutex;

## Header

    #include "tbb/null_mutex.h"

## Description

A `null_mutex` models the Mutex Concept syntactically, but does nothing. It is useful for instantiating a template that expects a Mutex, but no mutual exclusion is actually needed for that instance.

## Members

See Mutex Concept.

Parent topic: Mutexes

## See Also

Mutext Concept