Race condition

« Back to Glossary Index

Race Conditions in Electronics
– Race conditions can occur when logic gates combine signals from different paths.
– Inputs to the gate can change at slightly different times, causing the output to briefly change to an unwanted state.
– If the output functions as a clock signal for systems with memory, it can lead to a departure from the designed behavior.
– A race condition can also occur in logic circuitry used to detect certain outputs of a counter, leading to false matches.
– Design techniques like Karnaugh maps can help recognize and eliminate race conditions.

Types of Race Conditions
– Critical race conditions occur when the order of changing internal variables determines the eventual state of a state machine.
– Non-critical race conditions occur when the order of changing internal variables does not determine the eventual state of a state machine.
– Static race conditions occur when a signal and its complement are combined.
– Dynamic race conditions result in multiple unintended transitions due to interaction between gates.
– Essential race conditions happen when an input has two transitions in less than the total feedback propagation time.

Workarounds for Race Conditions
– Design techniques like Karnaugh maps can help identify and eliminate race conditions.
– Adding logic redundancy can eliminate some types of race conditions.
– Metastable states in logic elements can also cause problems for circuit designers.

Race Conditions in Software
– Race conditions can occur in software when multiple code paths execute simultaneously.
– Different execution times of code paths can lead to unanticipated behavior and software bugs.
– Critical race conditions often occur when processes or threads depend on shared state and fail to follow mutually exclusive access rules.
Data races are a type of race condition that can result in undefined behavior in C and C++ programs.
– Debugging race conditions can be challenging due to their non-deterministic nature, often referred to as Heisenbugs.

Consequences and Implications of Race Conditions
– Race conditions can lead to security vulnerabilities and denial of service attacks.
– Time-of-check-to-time-of-use (TOCTTOU) bugs can occur when a race condition affects security-sensitive code.
– Race conditions can be intentionally used to create hardware random number generators and physically unclonable functions.
– Privilege escalation can occur when an attacker exploits a race condition to manipulate shared resources.
– Race conditions can result in malfunctioning of actors that utilize a shared resource.
– Race conditions in software can have computer security implications.
– Race conditions in file systems can lead to data corruption or privilege escalation.
– Race conditions in networking can cause issues with distributed chat networks and non-blocking sockets.
– Race conditions in life-critical systems can have disastrous consequences.
– Various tools and techniques are available for detecting and mitigating race conditions in software.

Race condition (Wikipedia)

A race condition or race hazard is the condition of an electronics, software, or other system where the system's substantive behavior is dependent on the sequence or timing of other uncontrollable events. It becomes a bug when one or more of the possible behaviors is undesirable.

Race condition in a logic circuit. Here, t1 and t2 represent the propagation delays of the logic elements. When the input value A changes from low to high, the circuit outputs a short spike of duration (∆t1 + ∆t2) − ∆t2 = ∆t1.

The term race condition was already in use by 1954, for example in David A. Huffman's doctoral thesis "The synthesis of sequential switching circuits".

Race conditions can occur especially in logic circuits, multithreaded, or distributed software programs.

« Back to Glossary Index

Submit your RFP

We can't wait to read about your project. Use the form below to submit your RFP!

Gabrielle Buff
Gabrielle Buff

Just left us a 5 star review

Great customer service and was able to walk us through the various options available to us in a way that made sense. Would definitely recommend!

Stoute Web Solutions has been a valuable resource for our business. Their attention to detail, expertise, and willingness to help at a moment's notice make them an essential support system for us.

Paul and the team are very professional, courteous, and efficient. They always respond immediately even to my minute concerns. Also, their SEO consultation is superb. These are good people!

Paul Stoute & his team are top notch! You will not find a more honest, hard working group whose focus is the success of your business. If you’re ready to work with the best to create the best for your business, go Stoute Web Solutions; you’ll definitely be glad you did!

Wonderful people that understand our needs and make it happen!

Paul is the absolute best! Always there with solutions in high pressure situations. A steady hand; always there when needed; I would recommend Paul to anyone!

facebook
Vince Fogliani
recommends

The team over at Stoute web solutions set my business up with a fantastic new website, could not be happier

facebook
Steve Sacre
recommends

If You are looking for Website design & creativity look no further. Paul & his team are the epitome of excellence.Don't take my word just refer to my website "stevestours.net"that Stoute Web Solutions created.This should convince anyone that You have finally found Your perfect fit

facebook
Jamie Hill
recommends

Paul and the team at Stoute Web are amazing. They are super fast to answer questions. Super easy to work with, and knows their stuff. 10,000 stars.

Paul and the team from Stoute Web solutions are awesome to work with. They're super intuitive on what best suits your needs and the end product is even better. We will be using them exclusively for our web design and hosting.

facebook
Dean Eardley
recommends

Beautifully functional websites from professional, knowledgeable team.

Along with hosting most of my url's Paul's business has helped me with website development, graphic design and even a really cool back end database app! I highly recommend him as your 360 solution to making your business more visible in today's social media driven marketplace.

I hate dealing with domain/site hosts. After terrible service for over a decade from Dreamhost, I was desperate to find a new one. I was lucky enough to win...

Paul Stoute has been extremely helpful in helping me choose the best package to suite my needs. Any time I had a technical issue he was there to help me through it. Superb customer service at a great value. I would recommend his services to anyone that wants a hassle free and quality experience for their website needs.

Paul is the BEST! I am a current customer and happy to say he has never let me down. Always responds quickly and if he cant fix the issue right away, if available, he provides you a temporary work around while researching the correct fix! Thanks for being an honest and great company!!

Paul Stoute is absolutely wonderful. Paul always responds to my calls and emails right away. He is truly the backbone of my business. From my fantastic website to popping right up on Google when people search for me and designing my business cards, Paul has been there every step of the way. I would recommend this company to anyone.

I can't say enough great things about Green Tie Hosting. Paul was wonderful in helping me get my website up and running quickly. I have stayed with Green...