What happens when a thread calls P( S ) when it wants to enter its critical section, where S is a binary semaphore set to 1?
A) The thread is allowed to enter its critical section and S is decremented.
B) The thread is blocked and added to a queue of waiting threads.
C) The semaphore is set to 2.
D) none of the above

Question

Quizplus · Accepted Answer

When a thread calls P(S) on a binary semaphore set to 1, it decrements the semaphore to 0 and is allowed to enter its critical section.

What Happens When a Thread Calls P( S ) When