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10/6/23, 11:55 PM SYSC4001 Midterm Winter 2022 9/30/22, 1:57 PM : Quiz Submissions - SYSC 4001 A - Midterm Exam - SYSC4001A Operating Systems (LEC) Fall 2021 - Carleton University Quiz Submissions - SYSC 4001 A - Midterm Exam X Dana El Sherif (username: danaelsherif) Attempt 1 Written: Nov 3, 2021 1:05 PM - Nov 3, 2021 3:17 PM Submission View Released: Nov 23, 2021 12:40 PM Part 1 - Multiple Choice Questions Question 1 0 /1 point Which of the following is/are false? [1 mark] (i) The critical section problem concerns a system running multiple processes that do not access the shared variable concurrently (ii) When a process performs a wait operation on a condition variable it is always blocked " a) only (ii) = b) only (i) % ¢) both (i) and (ii) Question 2 0/ 1 point Which of the following is false? [1 mark] ) a) A deadlock cannot occur on systems in which resources are allowed to be used at the same time by multiple processes X b) A cycle in the resource allocation graph does not necessarily indicate a deadlock = c} A cycle in the resource allocation graph always indicates a deadlock 9/30/22, 1:57 PM : Quiz Submissions - SYSC 4001 A - Midterm Exam - SYSC4001A Operating Systems (LEC) Fall 2021 - Carleton University Which of the following is/are false? [1 mark] (i) A privileged instruction can be executed in the supervisor mode (i) A privileged instruction can be executed in the user mode (i) Entry to the critical section can be controlled both with the help of a semaphore v a) only (ii) about:blank 1/19

10/6/23, 11:55 PM SYSC4001 Midterm Winter 2022 9/30/22, 1:57 PM : Quiz Submissions - SYSC 4001 A - Midterm Exam - SYSC4001A Operating Systems (LEC) Fall 2021 - Carleton University Which of the following is/are false? [1 mark] (i) A privileged instruction can be executed in the supervisor mode (ii) A privileged instruction can be executed in the user mode (i) Entry to the critical section can be controlled both with the help of a semaphore v ) a) only (i " b) only (i) ¢) only (iii) ' d) both (i) and (i e) both (i) and (i) Question 4 1/1 point Which of the following is/are true? [1 mark] (i) The only way to prevent deadlocks is to make all the resources on the system preemptable (ii) A GPS related operation is often supported by an operating system running on a smart phone a) only (i) v b) only (i) I ¢} both (i) and (ii) Question 5 1/ 1 point Which of the following is true in the context of the Readers/Writer problem? [1 mark] 9/30/22, 1:57 PM : Quiz Submissions - SYSC 4001 A - Midterm Exam - SYSC4001A Operating Systems (LEC) Fall 2021 - Carleton University v/ | b) multiple reader processes can access the data simultaneously ) ¢} multiple reader processes and a single writer process can access the data simultaneously Question 6 1/1 point \A/hirh nf tha fallnwine ic acenriatad with tha nratartinn nf charad variashlac An a evcteam that about:blank 2/19

10/6/23, 11:55 PM SYSC4001 Midterm Winter 2022 9/30/22, 1:57 PM : Quiz Submissions - SYSC 4001 A - Midterm Exam - SYSC4001A Operating Systems (LEC) Fall 2021 - Carleton University v/ b) multiple reader processes can access the data simultaneously ) ¢} multiple reader processes and a single writer process can access the data simultaneously Question 6 1/ 1 point Which of the following is associated with the protection of shared variables on a system that runs multiple concurrent processes? [1 mark] a) The Round Robin CPU scheduling algorithm b) Resource Allocation graph v ¢} The Dining Philosopher's problem Question 7 2 / 2 points Consider a system in which 4 processes (P1, P2, P3 and P4) arrive at the same time. The order of arrival is P1, P2, P3 and P4. Each process comprises of a single CPU burst of duration T. Then which of the following is/are true? [2 marks] (i) the FCFS scheduling policy will produce the smallest average turnaround time that can be achieved on the system (ii) The average turnaround time that can be achieved the FCFS scheduling policy is T (iii) The average turnaround time achieved by the FCFS scheduling policy is 4T. (iv) The average turnaround time achieved by the FCFS scheduling policy is 2.5T /" a) both (i) and (iii) v b) both (i) and (iv) c) only (jii) 9/30/22, 1:57 PM : Quiz Submissions - SYSC 4001 A - Midterm Exam - SYSC4001A Operating Systems (LEC) Fall 2021 - Carleton University e) only (i) Question 8 1/ 1 point Which of the following is/are false? [1 mark] (i) Convenience is one of the important goals of an operating system iy A chared variahle that needc tn he nratected cannnt he arcecced cimultaneniiclv hv miiltinle about:blank 3/19

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10/6/23, 11:55 PM SYSC4001 Midterm Winter 2022 9/30/22, 1:57 PM : Quiz Submissions - SYSC 4001 A - Midterm Exam - SYSC4001A Operating Systems (LEC) Fall 2021 - Carleton University e) only (i) Question 8 1/ 1 point Which of the following is/are false? [1 mark] (i) Convenience is one of the important goals of an operating system (ii) A shared variable that needs to be protected cannot be accessed simultaneously by multiple reader processes I a) both (i) and (ji) v b) only (ii) I ¢} None of (i) and (ii) d) only (i) Question 9 1/1 point Which of the following is returned by a fork system call to the parent process? [1 mark] v a) The process Id of the child process ) b) O ) ¢} any positive integer Question 10 0 /1 point Consider a system that uses the long term scheduler, the medium term scheduler and the short term scheduler". Which of the following is/are true? [1 mark] (i) The medium term scheduler is typically invoked more frequently in comparison to the short term scheduler 9/30/22, 1:57 PM : Quiz Submissions - SYSC 4001 A - Midterm Exam - SYSC4001A Operating Systems (LEC) Fall 2021 - Carleton University (ii) The medium term scheduler is typically invoked more frequently in comparison to the long term scheduler = a) none of (i) and (ii) X b) only (ii) ¢} both (i) and (ii) about:blank 4/19

10/6/23, 11:55 PM SYSC4001 Midterm Winter 2022 9/30/22, 1:57 PM : Quiz Submissions - SYSC 4001 A - Midterm Exam - SYSC4001A Operating Systems (LEC) Fall 2021 - Carleton University (ii) The medium term scheduler is typically invoked more frequently in comparison to the long term scheduler = ) a) none of (i} and {ii) A b) only (ii) ¢} both (i) and (ii) d) only (i) Question 11 1/ 1 point Which of the following is/are true? [1 mark] (i) A GPS service is a standard component of an operating system running on a typical desktop computer (ii) A system call never leads to the invocation of the operating system ) a) only (i) v/ b) None of (i) and (ii) ¢) both (i) and (ii) d) only (ii) Question 12 1/ 1 point Which of the following is returned by a fork system call to the newly created child process? [1 mark] v ao ! b) anv positive integer 9/30/22, 1:57 PM : Quiz Submissions - SYSC 4001 A - Midterm Exam - SYSC4001A Operating Systems (LEC) Fall 2021 - Carleton University ") ¢) The process Id of the parent process Question 13 1/ 1 point Which of the following is/are true? [1 mark] (i) Accounting information is typically stored in a PCB (i) A process can directly reach the terminated state from the ready state about:blank 5/19

10/6/23, 11:55 PM SYSC4001 Midterm Winter 2022 9/30/22, 1:57 PM : Quiz Submissions - SYSC 4001 A - Midterm Exam - SYSC4001A Operating Systems (LEC) Fall 2021 - Carleton University [ ) ¢) The process Id of the parent process Question 13 1/ 1 point Which of the following is/are true? [1 mark] (i) Accounting information is typically stored in a PCB (ii) A process can directly reach the terminated state from the ready state a) only (ii) v b) only (i) ' ¢) both (i) and (ii) Question 14 1/ 1 point Which of the following is/are true? [1 mark] (i) If a process performs a wait operation on a semaphore then the process is always blocked (ii) A condition variable is often used to synchronize two concurrent processes ) a) both (i) and (ii) v b) only (ii) - ¢) only (i) Question 15 1 /1 point Which of the following is/are true? [1 mark] (i) Efficiency is one of the important goals of an operating system (ii) User convenience is not an important goal of an operating system v a) only (i) « Document continues below https://brightsj carleton.ca/d2l/ims/quizzing/ /quiz_submissions_attempt.d2|?isprv=&qi=73374&ai=649742&isInPopup=0&cfql=0&fromQB=0&f... 6/18 Discover more from: Operating Systems SYSC 4001 EL‘ 30 documents le about:blank 6/19

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10/6/23, 11:55 PM SYSC4001 Midterm Winter 2022 v . oa) omy\y v Document continues below https://brights carleton.ca/d2l/Ims/quizzing/user/quiz_submissions_attempt.d2|?isprv=&qi=733748&ai=649742&isInPopup=0&cfql=0&romQB=0&f... 6/18 Discover more from: /e Operating Systems - SYSC 4001 2 30 documents Go to course Midterm example Operating Systems 10 100% (1) Final Winter 2018 Sol Operating Systems 10 100% (1) SYSC 4001 Notes Full Course Operating Systems I None Assign O - lab O for sysc 4001 Operating Systems I None Tutorial-Unix Concurrency 2 Operating Systems I None 9/30/22, 1:57 PM : Quiz Submissions - SYSC 4001 A - Midterm Exam - SYSC4001A Operating Systems (LEC) Fall 2021 - Carleton University © ) b) only (ii) " ¢) both (i) and {ii) Question 16 1/ 1 point Which of the following is not stored in a PCB? [1 mark] v a) Process code about:blank 7/19

10/6/23, 11:55 PM SYSC4001 Midterm Winter 2022 9/30/22, 1:57 PM : Quiz Submissions - SYSC 4001 A - Midterm Exam - SYSC4001A Operating Systems (LEC) Fall 2021 - Carleton University " b) only (ii) " ¢) both (i) and {ii) Question 16 1/1 point Which of the following is not stored in a PCB? [1 mark] v a) Process code " b) Program Counter Value ! ¢) Process Id Question 17 0/ 1 point Which of the following is/are false? [1 mark] (i) A deadlock typically leads to the violation of the progress requirement associated with the solution to the critical section problem (ii) A deadlock may lead to the violation of the mutual exclusion requirement associated with the solution to the critical section problem ~a) both (i) and (ii) X b) only (i) = [ ¢) only(ii) Question 18 1/1 point Which of the following is/are true? [1 mark] (i) Two processes entering the critical section at the same time may violate one of the requirements associated with the solution to the critical section problem 9/30/22, 1:57 PM : Quiz Submissions - SYSC 4001 A - Midterm Exam - SYSC4001A Operating Systems (LEC) Fall 2021 - Carleton University © ) a) only (ii) ' b) only (i) v\ ¢) both (i) and (ii) Question 19 1/ 1 point about:blank 8/19

10/6/23, 11:55 PM SYSC4001 Midterm Winter 2022 9/30/22, 1:57 PM : Quiz Submissions - SYSC 4001 A - Midterm Exam - SYSC4001A Operating Systems (LEC) Fall 2021 - Carleton University ) a) only (ii) ' b) only (i) v c) both (i) and (ii) Question 19 1/ 1 point Which of the following is/are true? [1 mark] (i) More than one process can be created with a single Linux/Unix fork system call (ii) It is a good design practice to ensure that all the children processes have completed before the parent process terminates (iii) Entry to the critical section can be controlled with the help of a monitor a) only (i) b) both (i) and (ji) v | ¢} both (ii) and (iii) /- d) only (ii) e} only (iii) Question 20 1/1 point From which of the following states can the running state be directly reached by a process [1 mark] a) new state v/ b) ready state 9/30/22, 1:57 PM : Quiz Submissions - SYSC 4001 A - Midterm Exam - SYSC4001A Operating Systems (LEC) Fall 2021 - Carleton University Question 21 1 /1 point Which of the following is/are false? [1 mark] (i) With any message passing system a receiving process is never blocked (ii) The FCFS short term scheduling policy can lead to the monopolization of the CPU by processes with large CPU times (iiiy Communication between two processes requires the use of a single socket about:blank 9/19

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10/6/23, 11:55 PM SYSC4001 Midterm Winter 2022 9/30/22, 1:57 PM : Quiz Submissions - SYSC 4001 A - Midterm Exam - SYSC4001A Operating Systems (LEC) Fall 2021 - Carleton University Question 21 1/1 point Which of the following is/are false? [1 mark] (i) With any message passing system a receiving process is never blocked (ii) The FCFS short term scheduling policy can lead to the monopolization of the CPU by processes with large CPU times (iiiy Communication between two processes requires the use of a single socket a) only (ii) ! b) only (i) ) ¢} only (iii) I d) both (ii) and (iii) v/ ) &) both (i) and (jii) - ) (i), (i) and (iii) Question 22 0/ 1 point Which of the following is/are false? [1 mark] (i) 170 status information is typically stored in a PCB (i) It is not possible for a parent and child process to execute concurrently ~ a) both (i) and (ii) = b) only {ii) c) None of (i) and (ii) 9/30/22, 1:57 PM : Quiz Submissions - SYSC 4001 A - Midterm Exam - SYSC4001A Operating Systems (LEC) Fall 2021 - Carleton University Question 23 0 / 3 points Consider a system comprising three processes T1, T2 and T3 and three resource types: S1, 52 and S3. There is a single instance of S1land S3 and 2 instances of S2. T1 is holding one instance of S2 and has requested for one instance of S1. T2 is holding one instance of S1, one instance of S2 and has requested for one instance of S3. T3 is holding one instance of S3 and has requested for one instance of S2. Then which of the following is/are true? [3 marks] (i) there is one cycle in the resource allocation graph about:blank 10/19

10/6/23, 11:55 PM SYSC4001 Midterm Winter 2022 9/30/22, 1:57 PM : Quiz Submissions - SYSC 4001 A - Midterm Exam - SYSC4001A Operating Systems (LEC) Fall 2021 - Carleton University Question 23 0 / 3 points Consider a system comprising three processes T1, T2 and T3 and three resource types: S1, S2 and S3. There is a single instance of S1land S3 and 2 instances of S2. T1 is holding one instance of S2 and has requested for one instance of S1. T2 is holding one instance of S1, one instance of S2 and has requested for one instance of $3. T3 is holding one instance of S3 and has requested for one instance of S2. Then which of the following is/are true? [3 marks] (i) there is one cycle in the resource allocation graph (ii) there are multiple cycles in the resource allocation graph (i) there is a deadlock on the systems - a) both (i) and (iii) ' b) only (i) A c) both (i) and (iii) " d) only (iii) e) only (ii) Question 24 1/ 1 point Which of the following statements is false? [1 mark] a) For an operating system that performs cascading termination an orphan process can never exist on the system v/ b) For an operating system that performs cascading termination a zombie process can never exist on the system c) ltis possible for multiple children processes forked by a given parent process to execute concurrently 9/30/22, 1:57 PM : Quiz Submissions - SYSC 4001 A - Midterm Exam - SYSC4001A Operating Systems (LEC) Fall 2021 - Carleton University Consider a hard real time system running 2 periodic processes on a single CPU system. The deadline of each process is equal to its period. The execution time of each process is 1/3 of its period. Then which of the following is/are true? [2 marks] a) The Rate Monotonic Scheduling policy is not guaranteed to meet the deadline of all processes v/ b) The Rate Monotonic Scheduling policy is guaranteed to meet the deadlines of all processes about:blank 11/19

10/6/23, 11:55 PM SYSC4001 Midterm Winter 2022 9/30/22, 1:57 PM : Quiz Submissions - SYSC 4001 A - Midterm Exam - SYSC4001A Operating Systems (LEC) Fall 2021 - Carleton University Consider a hard real time system running 2 periodic processes on a single CPU system. The deadline of each process is equal to its period. The execution time of each process is 1/3 of its period. Then which of the following is/are true? [2 marks] a) The Rate Monotonic Scheduling policy is not guaranteed to meet the deadline of all processes v/ b) The Rate Monotonic Scheduling policy is guaranteed to meet the deadlines of all processes Question 26 0/ 1 point Which of the following is/are false? X [ a) The optimal CPU scheduling policy can give rise to the starvation of certain processes in the system . b) A deadlock cannot occur on a system that allows the preemption of resources = [ ) c) DMA s associated mainly with the "convenience" goal of the operating system Question 27 0/ 1 point Consider the producer consumer problem for which a bounded buffer is used. Note that each location in the buffer can hold an unconsumed element. What is the maximum number of unconsumed elements in a buffer of size 4? [1 mark] a) 3 = b4 X( )2 d) 1 9/30/22, 1:57 PM : Quiz Submissions - SYSC 4001 A - Midterm Exam - SYSC4001A Operating Systems (LEC) Fall 2021 - Carleton University (i) A monitor is a language construct used to observe the state of a process (ii) A transition from a blocked state always takes the process directly to a running state a) only (ii) = b) both (i) and (ii) r} anlv (i about:blank 12/19

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10/6/23, 11:55 PM SYSC4001 Midterm Winter 2022 9/30/22, 1:57 PM : Quiz Submissions - SYSC 4001 A - Midterm Exam - SYSC4001A Operating Systems (LEC) Fall 2021 - Carleton University (i) A monitor is a language construct used to observe the state of a process (ii) A transition from a blocked state always takes the process directly to a running state a) only (ii) = b) both (i) and (ii) / ¢) only (i) ~ d) None of (i} and (ii) Question 29 0 /1 point Which of the following is/are true? [1 mark] (i) The Shortest Job First CPU scheduling policy uses preemption to achieve its goals (ii) A preemptive CPU scheduling policy can never perform better than a non-preemptive CPU scheduling policy = a) None of (i) and (ii) ) b) both (i) and (ii) X c) only (i) d) only (i) Part 2 - Questions with Written Answers Question 30 3/ 6 points Consider the following arrivals on a system. Each process consists of a single CPU burst and does not perform any I/O. The arrival times and execution times for the processes are given below: [6 marks] 9/30/22, 1:57 PM : Quiz Submissions - SYSC 4001 A - Midterm Exam - SYSC4001A Operating Systems (LEC) Fall 2021 - Carleton University P1 0 3 P2 3 8 P3 4 2 P4 6 6 Find the average (mean) process turnaround time and the Fairness Factor when the Round Robin Scheduling policy (time slice = 3 seconds) is used for CPU scheduling. Assume that the overhead associated with preempting a process is negligible. NOTE that the fairness factor for a scheduling policy is defined as the ratio between the mean process waiting time and the mean process execution time. The waiting time for a process is the about:blank 13/19

10/6/23, 11:55 PM about:blank SYSC4001 Midterm Winter 2022 9/30/22, 1:57 PM : Quiz Submissions - SYSC 4001 A - Midterm Exam - SYSC4001A Operating Systems (LEC) Fall 2021 - Carleton University P1 0 3 P2 3 8 P3 4 2 P4 6 6 Find the average (mean) process turnaround time and the Fairness Factor when the Round Robin Scheduling policy (time slice = 3 seconds) is used for CPU scheduling. Assume that the overhead associated with preempting a process is negligible. NOTE that the fairness factor for a scheduling policy is defined as the ratio between the mean process waiting time and the mean process execution time. The waiting time for a process is the total time spent by the process in the ready queue. Provide your answer in the following space ONLY Mean Job Turnaround Time: 33 Mean Job Waiting Time: 11.5 Fairness Factor: 2.4 The correct answer is not displayed for Written Response type questions. D View question 30 feedback Question 31 0 / 6 points Consider the following arrivals on a system. Each process consists of a single CPU burst and does not perform any I/O. The arrival times and execution times for the processes are given below: [6 marks] Process Arrival Time (seconds) Execution Time (seconds) P1 0 3 P2 3 8 P3 4 2 P4 6 6 Find the average process turnaround time and the Fairness Factor when the Shortest Remaining — — o b ——— . oa 9/30/22, 1:57 PM : Quiz Submissions - SYSC 4001 A - Midterm Exam - SYSC4001A Operating Systems (LEC) Fall 2021 - Carleton University preempting a process is 0.1 seconds. Note that this overhead is incurred only when a process is preempted and not when the process voluntarily relinquishes the CPU. NOTE that the fairness factor for a scheduling policy is defined as the ratio between the mean process waiting time and the mean process execution time. The waiting time for a process is the total time spent by the process in the ready queue. Provide your answer in the following space ONLY 14/19

10/6/23, 11:55 PM about:blank SYSC4001 Midterm Winter 2022 9/30/22, 1:57 PM : Quiz Submissions - SYSC 4001 A - Midterm Exam - SYSC4001A Operating Systems (LEC) Fall 2021 - Carleton University preempting a process is 0.1 seconds. Note that this overhead is incurred only when a process is preempted and not when the process voluntarily relinquishes the CPU. NOTE that the fairness factor for a scheduling policy is defined as the ratio between the mean process waiting time and the mean process execution time. The waiting time for a process is the total time spent by the process in the ready queue. Provide your answer in the following space ONLY Mean Job Turnaround Time: Mean Job Waiting Time: Fairness Factor: The correct answer is not displayed for Written Response type questions. P View question 31 feedback Question 32 0/ 10 points In this problem you will be concerned with synchronization of processes with the help of a monitor called synchronize. Consider a system in which two sets of processess run concurrently on the system. There are 15 processes: P1 .... P15 in the first set and 10 processes: Q1 .. Q10 in the second set. Each process performs some computation. Before exiting the system each process must however make sure that at least 10 processes in the first set and at least 5 processes in the second set have completed their computations. The typical operations performed by a process are outlined below. Process Pi/Qi { 1. Perform computation. 2. Call procedure "done (set)" in the monitor synchronize. If the process is in the first set it passes the integer 1 as an argument, if the process is in the second set it passes the integer 2 as an argument. {A return from the monitor must imply that the required number of processes in each set have completed their computations and Pi/Qi can now exit.} }/ end of Pi/Qi 9/30/22, 1:57 PM : Quiz Submissions - SYSC 4001 A - Midterm Exam - SYSC4001A Operating Systems (LEC) Fall 2021 - Carleton University An unfinished structure of the monitor "synchronize" is provided. monitor synchronize { variable declarations procedure done (set) .... 15/19

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10/6/23, 11:55 PM SYSC4001 Midterm Winter 2022 9/30/22, 1:57 PM : Quiz Submissions - SYSC 4001 A - Midterm Exam - SYSC4001A Operating Systems (LEC) Fall 2021 - Carleton University An unfinished structure of the monitor "synchronize" is provided. monitor synchronize { variable declarations procedure done (set) .... {Initialization Code} } Your Job: Write the pseudo-code (algorithm) for the monitor for solving the synchronization problem described above. You only need to complete the variable declaration part, write the pseudo code for ““done’” and the variable initializations. Note that the variable declaration cannot include any semaphore. Please use the following boxes to include the appropriate component of your pseudo code (including comments) . Each box is labelled with its expected content: Variable Declarations, Procedure Declarations and Initialization Code. [10 marks] VARIABLE DECLARATION 9/30/22, 1:57 PM : Quiz Submissions - SYSC 4001 A - Midterm Exam - SYSC4001A Operating Systems (LEC) Fall 2021 - Carleton University about:blank 16/19

10/6/23, 11:55 PM SYSC4001 Midterm Winter 2022 9/30/22, 1:57 PM : Quiz Submissions - SYSC 4001 A - Midterm Exam - SYSC4001A Operating Systems (LEC) Fall 2021 - Carleton University PROCEDURE DECLARATIONS 9/30/22, 1:57 PM : Quiz Submissions - SYSC 4001 A - Midterm Exam - SYSC4001A Operating Systems (LEC) Fall 2021 - Carleton University INITIALIZATION CODE about:blank 17/19

10/6/23, 11:55 PM SYSC4001 Midterm Winter 2022 9/30/22, 1:57 PM : Quiz Submissions - SYSC 4001 A - Midterm Exam - SYSC4001A Operating Systems (LEC) Fall 2021 - Carleton University INITIALIZATION CODE The correct answer is not displayed for Written Response type questions. D View question 32 feedback Attempt Score:24 / 55 about:blank 18/19

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