Discussion
What is the purpose of a semaphore in process synchronization ?
Answer: B
A semaphore is used to control access to shared resources.
A semaphore is an integer variable changed only by the atomic operations wait (P) and signal (V). A binary semaphore enforces mutual exclusion on a critical section, and a counting semaphore limits how many processes may use a pool of resources at once. Semaphores are also used to order events between processes.
Scheduling is the job of the CPU scheduler, memory allocation the job of the memory manager, and interrupts are handled by interrupt service routines. A semaphore does none of these.
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