Answer Posted / chinnadurai.s

Synchronization tool that does not require busy waiting
Semaphore S–integer variable
Two standard operations modify S: wait()and signal()
Originally called P()andV()
Less complicated
Can only be accessed via two indivisible (atomic) operations

wait (S)
{
while S <= 0;
// no-op
S--;
}
&#61548;signal (S)
{
S++;
}

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