Question

what is true about binary semaphore?

1)Binary semaphore has drawback called busy wait or spin lock.

2)Binary semaphore is applicable only for two processes

3)Binary semaphore has no drawback called busy wait or spin lock

4)none of the above

Comments

I think option 1 and 2 is correct

But option  2 is more accurate..

Please check..

Answer 1

Ans 1)

as per Galvin, Binary semaphore has drawback called busy wait or spin lock. In B. Sem, the value never comes negative, it ranges (0,1). When Sem.value ==0 then busy wait happens.