Answer Posted / kondepati

->synchronization tool that does not require busy writing.
->semaphore S-integer variable
->can only be accessesd via two indivisible(atomic) operations
wait(S):while S<=0 do no-op;
S:=s-1;
signal(S):S+1;
semaphores are of two types

COUNTING SEMAPHORE-integer value can range over an
unrestricted domain.

BINARY SEMAPHORE-integer value can range only between 0 and
1;can be simpler to implement.

can implement a counting semaphore S as a binary semaphore.

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