What is a race condition?

Question

While writing programming related to multi-thread, one will encountered with race conditions. Can anyone help me what is race condition and how we can handle them?

Answer 1

Basically, race conditions occur when more threads want to access the shared data and as well as try to change the data at the same time. So, in able to prevent it, we can use a lock to the shared data, so that only one thread can access it at a time. Below is an example:

// Obtain lock for x

if (x == 5)

{

   y = x * 2; // Now, nothing can change x until the lock is released. 

              // Therefore y = 10

}

// release lock for x

I hope this will help.

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