A race condition is an unwanted situation in which a program

attempts to perform two or more operations at the same time, but

because of the logic of the program, the operations have to be

performed in proper sequence to run the program correctly.

Since it is an undesirable behavior, it is considered as a bug in

code.

Most of the time race condition occurs in “check then act” scenario.

Both threads check and act on same value. But one of the threads

acts in between check and act. See this example to understand race

condition.

if (x == 3) // Check

{

y = x * 5; // Act

// If another thread changes x

// between "if (x == 3)” and "y = x * 5”,

// then y will not be equal to 15.

}

https://www.techtarget.com/searchstorage/definition/race-condition