Consider a shared variable with initial value 10, this shared variable is used by four concurrent processes A, B, C and D. Process A reads the shared variable and decrements it by two and process B...

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Extracted text: Consider a shared variable with initial value 10, this shared variable is used by four concurrent processes A, B, C and D. Process A reads the shared variable and decrements it by two and process B reads the shared variable and increment it by three before writing it to the memory. Process C reads the shared variable and decrement it by three while process D reads the shared variable and increment it by two before writing it to the memory. All the process before reading the value performs the wait operation on a counting semaphore variable S and after writing it to the memory, a signal operation is performed before the processes get terminated. Find the minimum possible value of the shared variable in the memory if S is 2?