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Question:
(a) Answer the following questions based on the code snippet below.
1. int main (int argc, char *argv[]) 2. { 3. 4. pid_t processId; 5. 6. processId = fork (); 7. 8. 9. if (processId == 0) { 10. if (execl ("/usr/bin/ls", "ls", 0) == -1) { 11. perror ("execl failed "); 12. exit (1); 13. } 14. exit (0); 15. 16. } else { // processId greater than 0 case 17. wait (0); 18. exit (0); 19. } 20. return 0; 21. }
(i) Explain what happens after line 6 is executed.
(ii) Who (parent or child) executes code between lines 10-14?
(iii) Explain what is happening at line 10.
(iv) What is happening at line 17?
(b) Discuss why we have different processor modes and how these modes are used in typical operating systems.
(iii) (c) (i) What is meant by the term ‘affinity' in processor sheduling?
(ii) Discuss briefly the major issues that need to be addressed in designing multiprocessor operating systems.
Discuss any two of the following multiprocessor scheduling strategies
What is macro expansion
what is meant by lazzy swapper
with the aid of diagrams describe the following OS structure monolithic,layered and client server.
Essential Properties of Operating System 1. Batch: Jobs with similar needs are batched together and run through the computer as a group by an operator or automatic job sequen
Discuss difference between symmetric and asymmetric multiprocessing Symmetric multiprocessing (SMP), in which every processor runs an identical copy of the operating system an
Logical File System Responsible for providing the before discussed interface to the user including: File access. Directory operations. Security and protection.
Question: (a) Red Hat Linux is distributed under the Open Source agreement. Explain what you understand by Open Source distribution system. (b) Write a short note on the L
Determine a parser which is a variant of top-down parsing without backtracking Recursive Descend parser is a variant of top-down parsing without backtracking.
In a multiprogramming and time sharing environment several users share the system simultaneously .what are two such problems?
Which is most common phase structured grammar? Most common phase structured grammar is Context – Sensitive
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