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Operating systems (MESIIN477625)
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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:
Process
|
Arrival time
|
Burst time
|
Priority
|
P1
|
0 ms
|
4 ms
|
2
|
P2
|
1 ms
|
3 ms
|
1
|
P3
|
2 ms
|
5 ms
|
3
|
P4
|
3 ms
|
2 ms
|
2
|
P5
|
6 ms
|
3 ms
|
1
|
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?