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when we do double "signal(S)" operation on a  Binary semaphore'S' provided initial value of S=0, will the value of 'S' be 2 or it remains 1? 

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Take an example,

Suppose we do 8P and 20V operations on a binary semaphore S with initial value 1.

Then, 1P operation makes the value of S = 0

Remaining 7P are cancelled by 7V operations and now 13V operations remain.

Then, 1V makes S = 1 and other 12V have no effect. The value is still 1.
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