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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
Q. Could you replicate a multilevel directory structure with a single-level directory structure in which arbitrarily long names can be used? If your answer is yes describe how you
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what are the overall concepts of deadlock
Page Fault Handling conditions like, where the copy on write bit of a page is set and that page is send by more than one process, the Kernel assign new page and copies the conten
Define Virtual memory Virtual memory is employed in all major commercial operating systems
Can a direct access file be read sequentially? Explain. Yes. Keep a counter, cp, initially set to 0. After reading record cp, increment cp.
DIFFERENT MULTITHREADING MODELS Multithreading Models the majority multithreading models fall into one of the following categories of threading implementation: 1. M
Define ‘LRU’ page replacement policy LRU is Least Recently Used page replacement policy.
Effects of multiprogramming on resource utilization With the utilize of multiprogramming, batch processing is able to be quite efficient .Just as multiprogramming permits the
#include #include #include #include #include int main(void) { int pchan[2], pid, rval, cvar; char buf[20]; if (pipe(pchan) == -1){
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