Read

the following C program and answer the questions :

1 - After calling this program, how many processes exist?

2 - What distinguishes the parent

from the child?

3 - What is the purpose of the wait() system call in

a parent process?

4 - After execv("/bin/date", args), what

happens to the child’s original code?

5 - If /bin/date does not exist, what will happen?

From where does the CPU get the address of the

next instruction of a program to execute it?

You

are given the following processes:

For each of these scheduling algorithms:

- Priority Scheduling (preemptive + FIFO in case of similar priorities)

- Round Robin (quantum = 3 ms)

Write the execution order of processes as a sequence of time intervals.

Example format: FIFO: P1(0–8), P2(8–12), P3(12–21), ...

Note: We assume that low numbers represent high priority (P3 has the lowest priority here).

For each algorithm, compute the average waiting time. Which scheduling algorithm minimizes waiting time?

In a university library system, 5 students can read a numeric book at the same time, but only one librarian can update the catalog

at a time.

Which synchronization mechanism applies to each resource?

Given the following ARM assembly code, what is

the final value of register r2?  

Hint :

o cmp compare two

values by subtracting the second operand from the first.

o bne means branch

if not equal.

Given the following ARM assembly code, what is

the final value of register r2?  

Hint :

o cmp compare two

values by subtracting the second operand from the first.

o bne means branch

if not equal.

In many applications, developers can choose between creating threads or spawning new processes to achieve concurrency.

1 - Explain the key differences between threads and processes in terms of memory usage, communication, and overhead.

2 - Why is creating threads often considered preferable to creating new processes?

Read

the following C program and answer the questions :

1 - After calling this program, how many processes exist?

2 - What distinguishes the parent

from the child?

3 - What is the purpose of the wait() system call in

a parent process?

4 - After execv("/bin/date", args), what

happens to the child’s original code?

5 - If /bin/date does not exist, what will happen?

What are these processes states ? (Running, Ready or Blocked)

Which of the following statements about file allocation

methods is correct?