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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 are the phases of background processing? Phases are:- Job Scheduling. Job Processing. Job Overview.
What do you mean by system calls? System calls give the interface among a process and the operating system. When a system call is implemented, it is treated as by the hardware
What are the steps followed in testing? i. Unit testing - The individual components are tested in this type of testing. ii. Module testing - Related collection of independen
How does user specify block to be fetched in direct access? By specifying the relative block number, relative to first block in file, which is block 0.
What is banker's algorithm? Banker's algorithm is a deadlock avoidance algorithm that is applicable to a resource-allocation system with multiple examples of each resource type
Process States A total of nine states are acknowledged by the UNIX system. They are like as follow: User running Executing
What is contiguous allocation? Allocation of a group of consecutive sectors for a one file.
Discuss the high barriers to entry in the market for PL operating systems
What is dispatch latency? The time taken by the dispatcher to stop one process and begin another running is known as dispatch latency.
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