# null_rw_mutex Class

## Summary

Class that models `ReaderWriterMutex` Concept but does nothing.

## Syntax

    class null_rw_mutex;

## Header

    #include "tbb/null_rw_mutex.h"

## Description

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

## Members

See ReaderWriterMutex concept.

Parent topic: Mutexes

## See Also

ReaderWriterMutex Concept