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- Question
Which among the following is a system call used for process management
Options- A. fork()
- B. exec()
- C. getppid()
- D. All the above
- Correct Answer
- All the above
ExplanationAll the above listed are the System calls for process management
- 1. 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
- 2. 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
- 3. What is pre-emptive and non-preemptive scheduling? Discuss
- 4. What is a daemon? Discuss
- 5. Explain the meaning of mutex. Discuss
- 6. 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
- 7. 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; }
Discuss
- 8. A source program is the program written in which level language ?
Options- A. Alpha Numeric
- B. High-Level
- C. Symbolic
- D. Machine Discuss
- 9. main() { char *p; p = "Hello"; printf ("%cn", *&*p); }
Options- A. H
- B. Hello
- C. Compilation error
- D. H E L L O Discuss
- 10. Which of the following is not a valid escape code?
Options- A. "
- B. \
- C. '
- D. = Discuss
Operating Systems problems
Search Results
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:
Process Dispatcher,Vhand,Dbflush are the children of Scheduler
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
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: 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
Correct Answer: High-Level
Correct Answer: H
Explanation:
* is a dereference operator & is a reference operator. They can be applied any number of times provided it is meaningful. Here p points to the first character in the string "Hello". *p dereferences it and so its value is H. Again & references it to an address and * dereferences it to the value H
Correct Answer: =
Explanation:
The valid escape codes in programming languages are ', ", \, n, or t are the valid escape codes.
For example, the sequence \n usually represents a newline, while the escape sequence \\ represents a backslash, \t usually represents a newtab.
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