---
layout: pattern
title: Mutex
folder: mutex
permalink: /patterns/mutex/
categories: Concurrency
tags: 
 - Decoupling
---

## Also known as

* Mutual Exclusion Lock
* Binary Semaphore

## Intent
Create a lock which only allows a single thread to access a resource at any one instant.

## Class diagram
![alt text](./etc/mutex.png "Mutex")

## Applicability
Use a Mutex when

* You need to prevent two threads accessing a critical section at the same time
* Concurrent access to a resource could lead to a race condition 

## Credits

* [Lock (computer science)](http://en.wikipedia.org/wiki/Lock_(computer_science))
* [Semaphores](http://tutorials.jenkov.com/java-concurrency/semaphores.html)