Operating Systems Quiz

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Questions and Answers

What does the function e.getpid() return?

The ID of the currently loaded program

The current process ID of the calling process (correct)

The ID of the last terminated process

The process ID of the parent process

Which command is used to copy a file named 'source.txt' to 'destination.txt'?

mv source.txt destination.txt

copy source.txt destination.txt

duplicate source.txt destination.txt

cp source.txt destination.txt (correct)

What mechanism allows a parent process to check how a child process terminated?

The terminate() function

The wait() function (correct)

The getppid() function

The exit() function

What option with the ls command lists all files including hidden ones?

ls -a Signup and view all the answers

Which command would you use to permanently delete a file named 'file.txt'?

rm file.txt Signup and view all the answers

What is the main function of the mkdir command?

To create a new directory Signup and view all the answers

Which of the following commands is used to view currently running processes?

both B and C Signup and view all the answers

Which of these options allows the output of a command to be saved into a file?

Using the > operator Signup and view all the answers

What happens when the buffer is full in the producer-consumer problem?

The producer waits until the consumer consumes an item. Signup and view all the answers

Which function is used to signal the consumer after an item has been produced?

pthread_cond_signal Signup and view all the answers

What is the role of the mutex in the producer-consumer problem?

To ensure that only one thread can manipulate the buffer at a time. Signup and view all the answers

What will happen if the consumer tries to consume an item when the buffer is empty?

The consumer will wait until an item is produced. Signup and view all the answers

What is the primary purpose of condition variables in this implementation?

To synchronize access between producer and consumer threads. Signup and view all the answers

In the context of this code, what is a race condition?

When multiple threads modify shared data simultaneously, leading to inconsistent results. Signup and view all the answers

What is the purpose of the deletion flag in a file structure?

To mark the file as deleted without removing it Signup and view all the answers

Which allocation method requires that each file occupies a set of contiguous blocks?

Contiguous Allocation Signup and view all the answers

What does the 'blocks' array signify in the file allocation method?

Status of each block (free or occupied) Signup and view all the answers

What is indicated by a return value of 0 in the allocateContiguous function?

There is insufficient contiguous block space Signup and view all the answers

What does the allocateContiguous function primarily check before allocating blocks?

If sufficient contiguous blocks are available Signup and view all the answers

Which of the following statements is true about Linked Allocation?

Each block contains a pointer to the next block. Signup and view all the answers

What is a major advantage of Contiguous Allocation?

It allows for very quick file access due to sequential storage. Signup and view all the answers

In the context of file operations, what does 'Display File' functionality accomplish?

It shows the content of a file if it exists and is not deleted. Signup and view all the answers

What function is used to create a new thread in POSIX threads?

pthread_create Signup and view all the answers

What is the primary purpose of using mutexes in multithreading?

To synchronize access to shared resources Signup and view all the answers

Which of the following statements about pthread_join is true?

It blocks the calling thread until the specified thread finishes. Signup and view all the answers

In the provided mutex example, what happens when pthread_mutex_lock is called?

It sets the mutex to a locked state for the calling thread. Signup and view all the answers

What issue does the producer-consumer problem illustrate in multithreading?

Thread starvation Signup and view all the answers

What is the result of a race condition in a multithreaded program?

Shared data is accessed simultaneously leading to inconsistent results. Signup and view all the answers

Which function correctly locks a mutex before accessing a shared resource?

pthread_mutex_lock Signup and view all the answers

Where would you typically use thread joins in a multithreaded application?

At the end of the main function to prevent premature termination Signup and view all the answers

What is the purpose of the isSafe() function in the Banker's Algorithm?

To check if the system is in a safe state or not. Signup and view all the answers

In the context of the program, what does the need[][] array represent?

Remaining resources needed by each process. Signup and view all the answers

Why is the finish[] array used in the isSafe() function?

To record which processes have completed execution. Signup and view all the answers

What method is used to update the work[] vector in isSafe()?

By adding the resources allocated to finished processes. Signup and view all the answers

If the count variable in isSafe() reaches the value of P, what can be concluded?

All processes can finish with available resources. Signup and view all the answers

What condition would result in the isSafe() function returning false?

When no process can obtain its needed resources. Signup and view all the answers

In the context of the Resource Allocation Graph (RAG), what do the nodes represent?

Both processes and resources in the system. Signup and view all the answers

What is the primary function of the calculateNeed() function in the program?

To compute the difference between maximum needs and allocations. Signup and view all the answers

What is the primary purpose of the fork() function in the provided code?

To create a new child process Signup and view all the answers

What happens if the fork() function fails?

An error message is printed and the program exits Signup and view all the answers

In the child process, what exit status does it return before terminating?

10 Signup and view all the answers

Which function is used to wait for the child process to finish executing?

wait() Signup and view all the answers

What function is called to check if the child process exited normally?

WIFEXITED() Signup and view all the answers

What will happen if the exec() function is successful?

The process is replaced by the new program with no return Signup and view all the answers

What does the printf statement in the parent process output after the child exits normally?

Child exited with status 10 Signup and view all the answers

What is the purpose of getpid() in the child process?

To get its own process ID Signup and view all the answers

Which signal indicates that the child process was terminated abnormally?

WIFSIGNALED Signup and view all the answers

In the exec() example, which command is executed if exec() is successful?

ls -l Signup and view all the answers

Study Notes

Subject: Lab Assignment - Operating System

Student name: Suwarnika Srivastava
Registration number: 23BSA10092
Course code: CSE3003
Slot: A21 + A22 + A2
Assignment ID: 3

Question 1: Process Creation and Management

Objective: Understand process creation, termination, and management in the operating system.
Tasks: Write a C program to create a new process using fork().
- Implement the parent-child process relationship.
- Demonstrate process termination.
- Use exec() to replace a process image.
- Demonstrate the use of process IDs and status handling.

Question 2: Basic OS Commands

Objective: Learn and practice basic operating system commands.
Tasks:
- File management (e.g., ls, cp, mv, rm, touch).
- Process management (e.g., ps, kill, top).
- Directory navigation (e.g., cd, pwd, mkdir).
- I/O redirection and piping (e.g., |, >, >>).

Question 3: CPU Scheduling Algorithms

Objective: Simulate different CPU scheduling algorithms.
Tasks:
- Write a program to simulate First-Come-First-Served (FCFS) scheduling.
- Implement Shortest Job First (SJF) scheduling (with or without preemption).
- Simulate Round Robin (RR) scheduling and calculate turnaround and waiting times.
- Implement Priority Scheduling and test with different sets of priorities.

Question 4: Inter-Process Communication (IPC)

Objective: Implement communication between processes.
Tasks:
- Write a program using pipes for IPC between parent and child processes.
- Implement shared memory for communication between multiple processes.
- Use message queues to exchange data between processes.
- Demonstrate use of semaphores for synchronization.

Question 5: Thread Creation and Synchronization

Objective: Work with multithreading in an operating system.
Tasks:
- Create multiple threads using POSIX threads (pthreads) in C.
- Implement thread synchronization using mutexes or semaphores.
- Write a program to demonstrate race conditions and resolve them using locks.
- Simulate the producer-consumer problem using multithreading.

Question 6: Deadlock Detection and Prevention

Objective: Implement deadlock avoidance and detection techniques.
Tasks:
- Write a program to simulate a system with multiple resources and processes.
- Implement Banker's Algorithm for deadlock avoidance.
- Demonstrate deadlock detection using a resource allocation graph.
- Analyze a situation where deadlock occurs and suggest ways to resolve it.

Question 7: Memory Management Techniques

Objective: Implement and simulate different memory management techniques.
Tasks:
- Simulate paging and segmentation using C or Java.
- Implement page replacement algorithms (FIFO, LRU, Optimal).
- Write a program to simulate allocation and deallocation of memory blocks using First Fit, Best Fit, and Worst Fit algorithms.

Question 8: File System Implementation

Objective: Understand file system operations and implement basic file management.
Tasks:
- Write a program to simulate the creation, deletion, and manipulation of files in a directory.
- Implement file allocation methods (Contiguous, Linked, Indexed).
- Simulate disk scheduling algorithms (FCFS, SSTF, SCAN, C-SCAN).

Question 9: Virtual Memory Management

Objective: Work with virtual memory and page management.
Tasks:
- Implement a simulation of virtual memory using paging.
- Write a program to simulate the demand paging concept.
- Simulate page replacement policies (FIFO, LRU).
- Implement a program to track page faults during process execution.

Question 10: Disk Scheduling Algorithms

Objective: Understand and implement various disk scheduling algorithms.
Tasks:
- Simulate First-Come-First-Served (FCFS) disk scheduling.
- Implement Shortest Seek Time First (SSTF) disk scheduling.
- Write a program to simulate SCAN, C-SCAN disk scheduling.

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Description

Test your knowledge on key concepts in operating systems with this quiz. Questions cover various commands, process management, and synchronization mechanisms like the producer-consumer problem. Perfect for students studying operating systems and related topics.