Answer:
Explanation:
Following are the Semaphores:
Customers: Counts waiting customers;
Barbers: Number of idle barbers (0 or 1)
mutex: Used for mutual exclusion.
Cutting: Ensures that the barber won’t cut another customer’s hair before the previous customer leaves
Shared data variable:
count_cust: Counts waiting customers. ------------copy of customers. As value of semaphores can’t access directly.
// shared data
semaphore customers = 0; semaphore barbers = 0; semaphore cutting = 0; semaphore mutex = 1;
int count_cust= 0;
void barber() {
while(true) { //shop is always open
wait(customers); //sleep when there are no waiting customers
wait(mutex); //mutex for accessing customers1
count_cust= count_cust-1; //customer left
signal(barbers);
signal(mutex);
cut_hair();
}
}
void customer() {
wait(mutex); //mutex for accessing count_cust
if (count_cust< n) {
count_cust= count_cust+1; //new customer
signal(customers); signal(mutex);
wait(barbers); //wait for available barbers get_haircut();
}
else { //do nothing (leave) when all chairs are used. signal(mutex);
}
}
cut_hair(){ waiting(cutting);
}
get_haircut(){
get hair cut for some time; signal(cutting);
}
Answer:
1. Open Shortest Path First (OSPF)
2. Border Gateway Protocol (BGP)
3. Routing and Remote Access Service (RRAS)
4. Frame relay
5. Synchronous
6. Virtual
7. Committed Information Rate (CIR)
8. Integrated Services Digital Network (ISDN)
9. Asynchronous Transfer Mode (ATM)
10. Basic Rate Interface (BRI).
To get the number ot decoder output:
2^n; where n is number of input
2^4
2 × 2 × 2 × 2 = 16 outputs
Leonardo da Vinci was a very famous painter. I would assume that he is an expert in painting.
Hope this helped
