Nonpreemptive vs Preemptive Scheduling Quiz

What is the primary purpose of the medium-term scheduler?

To change memory requirements and free up memory
To reduce the degree of multiprogramming (correct)
To suspend and resume process execution
To improve the process mix in memory

What information is stored in the process control block (PCB) during a context switch?

The value of the CPU registers, the process state, and memory-management information (correct)
The process state, memory-management information, and the current time
The process state and memory-management information
The value of the CPU registers and the process state

What is the purpose of a context switch?

To change the memory management settings for the current process
To suspend the current process and resume a different process
To switch the CPU from kernel mode to user mode
To save the state of the current process and load the state of a new process (correct)

What is the relationship between the CPU registers and the process context?

The CPU registers are used to store the current state of the process (B) Signup and view all the answers

What is the purpose of saving the current context when an interrupt occurs?

To allow the system to restore the context when the interrupt processing is complete (A) Signup and view all the answers

How does the medium-term scheduler handle changes in memory requirements?

By suspending and resuming processes as needed (B) Signup and view all the answers

What is the primary purpose of saving the state information when an interrupt occurs?

To allow the process to be continued correctly afterward (A) Signup and view all the answers

Which of the following is NOT part of the information stored in the Process Control Block (PCB)?

Information about the program's output (D) Signup and view all the answers

How does the concept of a 'thread' extend the process concept in modern operating systems?

Threads allow a process to have multiple independent execution paths (C) Signup and view all the answers

What is the primary benefit of having multiple threads within a single process on a multicore system?

It allows the process to run multiple tasks in parallel (D) Signup and view all the answers

What information is included in the PCB to support the memory management of a process?

The value of the base and limit registers, and the page or segment tables (B) Signup and view all the answers

What is the main purpose of saving the state information, including the program counter, when an interrupt occurs?

To allow the process to be continued correctly afterward (A) Signup and view all the answers

What is the key difference between preemptive and nonpreemptive scheduling?

Preemptive scheduling allows the CPU to be taken away from a process before it completes, while nonpreemptive scheduling does not. (C) Signup and view all the answers

What is the main concern highlighted when discussing preemptive scheduling and shared data among processes?

Race conditions can arise when one process is preempted while updating shared data. (C) Signup and view all the answers

What is the role of the dispatcher in CPU scheduling?

Dispatcher is responsible for switching context and jumping to the proper location in the user program. (B) Signup and view all the answers

What aspect of preemptive scheduling causes race conditions with shared data?

Preemption of a process while it is updating shared data. (A) Signup and view all the answers

In the context of scheduling, what does nonpreemptive scheduling imply about a process and the CPU?

Once a process is given the CPU, it will keep it until it voluntarily releases it or terminates. (B) Signup and view all the answers

Which component plays a crucial role in determining which process gets control of the CPU under preemptive scheduling?

Dispatcher (B) Signup and view all the answers

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