race condition, race conditions, operating systems, common operating systems

race condition, race conditions, operating systems, common operating systems

When more than one process is executing the same code or accessing the same memory or any shared variable in that condition there is a possibility that the output or the value of the shared variable is wrong so for that all the processes doing the race to say that my output is correct this condition known as a race condition.

A condition in which the critical section (a part of the program where shared memory is accessed) is concurrently executed by two or more threads. It leads to incorrect behavior of a program.
In layman terms, a race condition can be defined as a condition in which two or more threads compete together to get certain shared resources.

For example, if thread A is reading data from the linked list and another thread B is trying to delete the same data. This process leads to a race condition that may result in run time error.

There are the following two solutions to avoid race conditions.

● Mutual exclusion : Mutual exclusion implies that only one process can be inside the critical section at any time. If any other processes require the critical section, they must wait until it is free.

● Synchronise the process : Progress means that if a process is not using the critical section, then it should not stop any other process from accessing it. In other words, any process can enter a critical section if it is free.
In order to prevent race conditions, one should ensure that only one process can access the shared data at a time. It is the main reason why we need to synchronise the processes. Another solution to avoid race condition is mutual exclusion. In mutual exclusion, if a thread is using a shared variable or thread, another thread will exclude itself from doing the same thing.

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