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- Question
What is pre-emptive and non-preemptive scheduling?
- Correct Answer
- Preemptive scheduling: The preemptive scheduling is prioritized The highest priority process should always be the process that is currently utilized Non-Preemptive scheduling: When a process enters the state of running, the state of that process is not deleted from the scheduler until it finishes its service time
- 1. What is a daemon? Discuss
- 2. Explain the meaning of mutex. Discuss
- 3. Explain the concept of the Distributed systems? Discuss
- 4. Differentiate between Complier and Interpreter? Discuss
- 5. What are necessary conditions for dead lock? Discuss
- 6. Which among the following are not the children of Swapper or Scheduler?
Options- A. Process Dispatcher
- B. Vhand
- C. Dbflush
- D. All the above Discuss
- 7. main() { fork(); printf(?Hello World!?); } Output for the above unix program is
Options- A. Hello World!
- B. Hello World!Hello World!
- C. Hello World
- D. None Discuss
- 8. Which among the following is a system call used for process management
Options- A. fork()
- B. exec()
- C. getppid()
- D. All the above Discuss
- 9. main() { char s[ ] = "man"; int i; for( i=0; s[ i ]; i++) printf( "n%c%c%c%c", s[ i ], *(s+i), *(i+s), i[s] ); }
Options- A. mmmm aaaa nnnn
- B. aaaa mmmm nnnn
- C. nnnn aaaa mmmm
- D. None Discuss
- 10. What will be output of following c code? #include
int main() { int x=123; int i={ printf("c" "++") }; for(x=0;x<=i;x++){ printf("%x ",x); } return 0; }
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Operating Systems problems
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Correct Answer: Daemon is a program that runs in the background without user?s interaction A daemon runs in a multitasking operating system like UNIX A daemon is initiated and controlled by special programs known as ?processes?
Correct Answer: Mutex is the short form for ?Mutual Exclusion object? A mutex allows multiple threads for sharing the same resource The resource can be file A mutex with a unique name is created at the time of starting a program A mutex must be locked from other threads, when any thread that needs the resource When the data is no longer used / needed, the mutex is set to unlock
Correct Answer: Distributed systems work in a network They can share the network resources, communicate with each other
Correct Answer: An interpreter reads one instruction at a time and carries out the actions implied by that instruction It does not perform any translation But a compiler translates the entire instructions
Correct Answer: 1 Mutual exclusion (where at least one resource is non-sharable) 2 Hold and wait (where a process holds one resource and waits for other resource) 3 No preemption (where the resources can?t be preempted) 4 Circular wait (where p[i] is waiting for p[j] to release a resource i= 1,2,?n j=if (i!=n) then i+1 else 1 )
Correct Answer: All the above
Explanation:
Process Dispatcher,Vhand,Dbflush are the children of Scheduler
Correct Answer: Hello World!Hello World!
Explanation:
The fork creates a child that is a duplicate of the parent process. The child begins from the fork().All the statements after the call to fork() will be executed twice.(once by the parent process and other by child). The statement before fork() is executed only by the parent process
Correct Answer: All the above
Explanation:
All the above listed are the System calls for process management
Correct Answer: mmmm aaaa nnnn
Explanation:
s[i], *(i+s), *(s+i), i[s] are all different ways of expressing the same idea.Generally array name is the base address for that array. Here s is the base address. i is the index number/displacement from the base address. So, indirecting it with * is same as s[i]. i[s] may be surprising. But in the case of C it is same as s[i].
Correct Answer: Output: c++0 1 2 3 Explanation: First printf function will print: c++ and return 3 to variable iFor loop will execute three time and printf function will print 0, 1, 2 respectively
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