In software, a critical race condition is when a situation results in a bug with unpredictable or undefined behavior. For example, if flipping two light switches connected to a common light at the same time blows the circuit, it is considered a critical race condition.
A critical race condition will cause the end state of the device, system or program to change. Two categories that define the impact of the race condition on a system are referred to as critical and noncritical: There are a few types of race conditions. Because the gate output state takes a finite, nonzero amount of time to react to any change in input states, sensitive circuits or devices following the gate may be fooled by the state of the output and not operate properly. Race conditions occasionally occur in logic gates when inputs come into conflict. Process 2 then performs a bit flip and changes the memory value from 1 to 0. Process 1 performs a bit flip, changing the memory value from 0 to 1. the computer crashes or identifies an illegal operation of the programįigure 1. The result may be one or more of the following: In computer memory or storage, a race condition may occur if commands to read and write a large amount of data are received at almost the same instant, and the machine attempts to overwrite some or all of the old data while that old data is still being read. One instruction might cancel the other or the two actions might trip the circuit breaker. With that in mind, imagine what might happen if two people tried to turn on the light using two different switches at the same time. If the light is on, moving either switch from its current position turns the light off. Similarly, if the light is off, then moving either switch from its current position turns the light on. When these types of circuits are used, the switch position becomes irrelevant. 
In some homes, there are multiple light switches connected to a common ceiling light. A simple example of a race condition is a light switch.
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