Question: Propose your problem which may encounter process synchronization, and use a semaphore to solve the problem.

 

Solution:

My problem: Whenever a process is constantly checking semaphore value while waiting (see while(s==0) in the P operation) and wasting CPU cycles, we can take the following train of thought to avoid this situation:

 

 

P(Semaphore s)

{

S=S - 1;

if (s<0){

block();
}

}

V(Semaphore s)

{

S = S + 1;

if(s > = 0){

wakeup (p);

}

}